Machine-economy newswire and paid changes-since for agents. MCP is challenge-handoff, not a wallet.
Listed on
First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
1
Directories
Collected by InvokeRank
176
Tools
From an anonymous probe
-
ToolBench grade
Not graded by Arcade
-
GitHub stars
No repository data
Tools
| Tool | Description | Behaviour |
|---|---|---|
| accessibility_contrast_calculator | Calculate WCAG 2.x sRGB contrast for one caller-supplied foreground/background pair of hex colours (#RRGGBB). Returns JSON with the contrast ratio and AA/AAA threshold booleans for normal or large text. Does not assess a whole interface, support alpha colours or certify accessibility. Pay 1000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| accrual_cutoff_audit | Compare each entry service date with its posting date against a period cutoff, and total what is in the wrong period. Reports work done before the cutoff and posted after it, which understates the period unless an accrual puts it back, and an amount posted inside the period for later service, which overstates it. An entry with no service date is reported as undeterminable rather than assumed to belong where it was posted. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| aggregate_reconciliation | Check that detail rows add up to the totals a summary declares, group by group. Sums are computed exactly on the decimal text, never through floating point: a float sum of 0.10 and 0.20 is 0.30000000000000004, so a tool built on one reports a false mismatch on the group that actually balances. Reports mismatches with the exact difference, groups with detail and no declared total, and totals with no detail at all. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| alert_rule_audit | Audit a Prometheus rule file. Reports an alert with no for clause, which fires on a single evaluation so one scrape failure is a page; a duplicate alert name, which notifications and silences cannot distinguish; a missing routing label or runbook annotation; a rate applied to a gauge, where the result is a number with no meaning rather than a wrong one; and a reference to a metric that is not in a supplied list, where the rule never fires so it looks like coverage and is none. Pay 170000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| api_response_contract_audit | Audit an HTTP response you captured against a contract you declare: expected status or status class, required and forbidden headers, header value rules, and a body schema. Header names compare case-insensitively. You supply the response, so this works against an API behind authentication or on a private network. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| avro_compatibility_mode_audit | Judge a sequence of Avro schema versions against a named compatibility mode: BACKWARD, FORWARD or FULL, each with its transitive form, or NONE. A transitive mode compares every version against every earlier one; a per-step mode compares only the immediate predecessor, and the gap that leaves is stated rather than hidden. Every comparison performed is listed with its directional result, so a caller can see what was checked as well as the verdict. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| avro_schema_audit | Audit one Avro schema for what it makes impossible later. Reports a field with no default, which cannot be removed without breaking readers; a nullable field with no default; a null default where null is not the first union branch, which is invalid; an enum with no default, which makes adding a symbol permanently breaking; an absent namespace on a top-level record; a logical type on a base the specification disallows; and a binary float on a monetary field name. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| avro_schema_compatibility | Decide whether two Avro schemas are compatible, in both directions, under the resolution rules rather than by structural comparison. Backward is a reader on the new schema reading data already written with the old one; forward is a reader still on the old schema reading data written with the new one. Fields match by name with reader aliases consulted, int promotes to long, float and double one way only, and an enum symbol the reader lacks needs an enum default. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| bank_statement_reconciliation | Match bank statement lines against ledger lines. References are matched before amounts, because a reference is an identity and an amount is not: matching on amount first pairs two unrelated lines that happen to agree and reports the real pair as unmatched. A reference match with a disagreeing amount or date is reported with the exact difference rather than discarded. With both balances supplied, the statement is also checked for agreeing with itself. Pay 240000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| base_finality_snapshot | How settled is Base right now? Returns the latest and finalized block heights, how many confirmations the finalized head trails by, and both timestamps. Lets an agent decide whether a transaction is safe to treat as done, instead of guessing a confirmation count. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| base_network_snapshot | Is Base ready to transact right now? One call returns the current block height, gas price in wei and how many seconds old the chain head is, all read at the same block. Refuses before payment if the endpoint is on the wrong chain or its head is stale, so you are never charged for a reading that is quietly out of date. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| base_nft_owner | Who owns this Base ERC721 token right now? Returns the current owner address at a pinned block. A token with no owner is refused before payment rather than returned as the zero address, which a caller could otherwise mistake for a real holder. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| base_token_metadata | Read a Base token name, symbol, decimals and total supply in one call. Handles tokens that return a bytes32 name or symbol instead of a string, which is the case that breaks naive decoders. Fields the contract does not implement come back null and are listed, rather than guessed at. Refuses an address with no contract. Pay 6000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| base_transaction_outcome | Did my Base transaction work and what did it cost? One call returns success or reverted, gas used, effective gas price, the fee in wei and in exact decimal ETH, confirmations behind the head, sender, recipient, value and log count. Pending and unknown hashes get a definite answer rather than an error. Pay 6000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| base_wallet_snapshot | Read a Base wallet native ETH balance and up to five ERC20 token balances at one pinned block. Separate balance lookups each answer at whatever height they happened to see, so they cannot be compared; these are all read at the same block and the block is in the response. Replaces six calls with one. Pay 8000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| batch_page_fingerprint | Watch up to ten reviewed public pages in one call. Supply the previous text hashes and it returns which pages actually changed, not ten hashes for you to compare. Hashes both the raw HTML and the visible text, so markup churn can be told from a real content change. A page that cannot be fetched is named individually and does not fail the batch. Pay 60000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| canonical_robots_consistency_audit | Audit canonical and robots directives across a set of supplied pages together. Reports a canonical chain, where one page names another that names a third and crawlers do not follow reliably; pages consolidating onto a target that declares noindex; a page declaring noindex while naming itself canonical; an X-Robots-Tag header disagreeing with the markup, where which one wins is not under the page author control; a canonical crossing hosts; and pages with none at all. Nothing is fetched. Pay 110000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| categorical_distribution_drift | Compare the distribution of one categorical column between two datasets. Reports a category that appeared - which a consumer switching exhaustively on the column has no branch for - a category that vanished, and shares that moved beyond a tolerance. Shares are proportions of all rows including empty ones, so a rising empty rate is visible rather than hidden by renormalisation. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| ci_workflow_contract_audit | Audit a CI workflow for what it leaves movable or undeclared. Reports actions pinned to a tag rather than a commit - a tag can be moved by whoever owns the action, so the code a step runs can change without this file changing - missing permissions and timeouts, a job depending on one that is not declared, a pull_request_target trigger, and an expression interpolated straight into a shell command. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| column_profile_drift | Compare two vintages of the same dataset and report where each column drifted. Covers columns added, removed and reordered, null-rate movement beyond a tolerance, a dominant type that changed, cardinality that moved, and a range that widened - which means values outside what anything downstream was built for, whatever the distribution looks like. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| company_evidence_pack | Company enrichment and KYB data for due diligence by domain: verify a counterparty, supplier or vendor before outreach, onboarding or payment. Returns firmographics (legal name, LEI, SEC CIK, industry, HQ, founded, employees), domain intelligence (age, email provider, SPF/DMARC), public role emails, socials, plus OFAC SDN and EU sanctions screening. Source-cited; unknowns null. Company data only, not personal contacts or compliance clearance. Unresolvable domains not charged. Pay 60000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| container_compose_contract_audit | Audit a Compose document against a contract. Reports an unpinned image tag, so the same file will produce a different container once the tag moves, a missing healthcheck or restart policy, a privileged or host-network service, added capabilities, host path mounts, a dependency on a service that is not declared, and an environment value written literally in the file rather than referencing a variable. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| cookie_attribute_audit | Parse Set-Cookie headers and report their attributes. Names cookies with no Secure, no HttpOnly or no SameSite; SameSite=None without Secure, which browsers reject so the cookie is never set at all; an unrecognised SameSite value, where the default applies instead; a lifetime beyond a stated maximum; an unexpected Domain; and a Domain attribute at all, which widens a cookie to every subdomain. No cookie value is returned, only its length. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| cross_format_record_crosscheck | Compare one logical record declared in two or three of Avro, protobuf and GraphQL, and report where the representations disagree. Names are matched with case and underscores set aside, since snake_case and camelCase across these formats is convention rather than disagreement. Reports a field present in one format and not another, a type class mismatch, disagreeing optionality or repeatedness, and enum symbol sets that differ. Pay 250000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| csp_structural_audit | Parse one Content-Security-Policy and report its structure, with the fallback rules applied. A fetch directive absent while default-src is present is reported as covered; base-uri and frame-ancestors do not fall back, so absence there is a finding. unsafe-inline alongside a nonce is reported differently from unsafe-inline alone, since supporting browsers ignore it. A repeated directive is reported because only the first takes effect. Structure only, not an assessment of adequacy. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| currency_minor_unit_audit | Check that each amount can exist in the currency it names. Reports an amount needing more decimal places than its currency has, where a currency with no sub-unit cannot hold a fraction at all. Also reports an amount that arrived as a JSON number rather than a decimal string, since a binary double cannot hold most two-place decimals exactly, so the digits may already differ from what was written. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| data_compatibility_checker | Compare caller-supplied source and target flat field schemas before ingestion, migration, CI deployment or machine-to-machine handoff. Returns a deterministic JSON mismatch report with type incompatibilities, missing required fields, nullability warnings and remediation codes. Does not fetch data or validate nested schemas, data values or runtime API behaviour. Pay 3000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dataset_overlap_audit | Check whether datasets that are meant to be disjoint share any keys. A key in both a training and an evaluation split means the evaluation is measuring memorisation, and every figure computed from it is optimistic. Reports overlap per pair with the share of the smaller set, since that is the one whose measurements are compromised, plus keys appearing in every dataset. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dataset_reconciliation | Reconcile two datasets you supply and get one answer plus every disagreement. Reports keys present on only one side, keys duplicated on either side, whether the join is really 1:1 or silently N:M, and field-level differences with the row number on each side. Numbers compare exactly on their decimal text, never through floating point, so 42.50 and 42.5 agree while 9007199254740992 and 9007199254740993 do not. A repeated key is compared as an unordered multiset. Nothing is fetched. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dead_letter_batch_audit | Triage a dead letter queue. Groups entries by failure reason, names the dominant cause when one accounts for most of the queue, and separates retryable failures from permanent ones so you know whether replaying will work or fail again. Reports the same item failing more than once, and entries stating no reason at all, which cannot be triaged by anybody. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dependency_manifest_diff | Compare two dependency manifests and classify each move. Below 1.0.0 the versioning convention promises no stability, so a 0.x minor change is treated as potentially breaking - flagging only major bumps would miss the change that breaks most often. A range changing is reported as a change of intent rather than a version moving, and a dependency moving between a development and a runtime group is reported because it changes what ships. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dkim_record_audit | Audit DKIM selector records. The key length follows from the length of the encoded public key, so a short RSA key is readable from the record itself with no cryptography. Reports a key shorter than a stated minimum; a selector left in testing mode, which asks receivers to treat a failure as unsigned so it cannot contribute to DMARC alignment however correctly it signs; a revoked key, with its consequence; and a key type verifiers do not implement. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dmarc_record_audit | Audit a DMARC record. Reports an absent or unrecognised policy tag, which makes the whole record ignored; a pct below 100, where the policy applies to that share of failing mail and the rest is treated as none, so a rollout left part way is not the policy it appears to be; a subdomain policy weaker than the organisational one; a reporting address outside the domain, which needs an authorising record there or no reports arrive; and a tag DMARC does not define. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dns_record_diff | Compare two DNS zone snapshots and report what the change does. Losing the last record of a type at a name stops something resolving once caches expire, and losing one value out of several does not, so the two are separated. A value change at one name is reported as a change rather than as an unrelated removal and addition. A TTL change is reported for its own reason: the old TTL governs how long the old answer survives, so a new one does not take effect until the old has expired. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dns_zone_contract_audit | Audit a DNS zone against the rules that make a zone illegal or make it quietly not work. Reports a CNAME at the apex, which is forbidden because the apex must also carry SOA and NS; a CNAME alongside any other record type; an MX, NS or CNAME pointing at a name that is itself a CNAME, whose failure is intermittent rather than total; a target inside the zone the zone does not define; a cyclic CNAME chain; TTLs that differ within one record set; and a record outside the zone. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| docker_compose_contract_audit | Audit one Docker Compose file and resolve its internal references. Reports two services publishing the same host port, where only one can bind; a named volume or network mounted and never declared; a dependency on a service this file does not define; a depends_on with no condition, so Compose waits for the container to start rather than for the service to be ready; and a wait for a service with no healthcheck, which can never be satisfied. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| dockerfile_layer_audit | Audit one Dockerfile for what its layers will cost and what its build records. Line continuations are joined first, which is what makes the layer questions answerable at all. Reports a package index updated in a layer of its own, so a later install uses a cached index months stale; a dependency install after a copy of the whole context, so that layer rebuilds on every source change; a download piped into a shell; and a credential-shaped build variable, recorded in the image history. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| double_entry_ledger_audit | Check that journal entries balance, with exact decimal arithmetic. Reports an entry whose debits and credits differ, with the exact difference; a line carrying both a debit and a credit, which means two things to two readers; a negative debit, which is a credit written in a form that defeats every sign-based check downstream; a posting to an account outside a supplied chart; a repeated posting reference; and a posting into a period the caller says is closed. Pay 250000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| duplicate_key_audit | Find duplicate keys in one dataset, exactly and nearly. An exact duplicate is reported with every row it occupies. A near duplicate is two different keys that become identical once case, spacing or punctuation is set aside, which a unique index accepts and which is almost always the same entity entered twice. Keys are canonicalised exactly, so 42 and 42.0 are one key. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| email_header_authentication_audit | Read the authentication headers a receiver added to one message. Headers are unfolded first, because a field continues on any line beginning with whitespace. Reports two From headers, where what is displayed and what is evaluated can differ, which is the shape of a spoof rather than a mistake; a lower Authentication-Results, which can have been written before the message arrived; a result from an untrusted server; and a DKIM or SPF domain that does not align with the From domain. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| env_contract_audit | Audit a set of environment variables against a contract, without returning any value. Reports required variables that are absent, and separately those present but empty - which suppresses a default where absence does not. Checks value shapes such as port, url or duration, flags undeclared and forbidden variables, and names any value shaped like a credential without printing it. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| env_diff | Compare two sets of environment variables without revealing either side. Reports what was added, removed and changed, and describes each change by length and character classes rather than by value, so it is safe to run between staging and production. Flags a value that became empty, a value whose character classes changed, and a new variable shaped like a credential. Pay 90000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| env_file_contract_audit | Audit a .env file and compare it with an example. Reports a duplicate name, where loaders disagree over which wins; an unquoted value with a trailing comment or space, kept by some loaders and trimmed by others; an interpolation of a name the file does not define, which most loaders substitute as empty so the value is silently incomplete; a required name absent or empty; and a name present in one file and not the other. No value is ever returned. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| error_budget_audit | Measure an error budget against real counts, with exact decimal arithmetic rather than floating point. Reports the budget exhausted or mostly consumed, the objective not met, and a burn rate per interval above the sustainable one. A budget that rounds to fewer than one event is reported as carrying no information, since any failure is then a breach. Intervals are sorted by start, so the order supplied does not change the answer. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| event_batch_contract_audit | Audit a mixed batch of events, each against the schema for its own type. Reports the failing event index, type and pointer for every breach, events carrying no usable type, and event types with no schema supplied - because silently not validating a new type is how it reaches a consumer unchecked. Declared types nothing in the batch used are listed too. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| event_idempotency_audit | Find out whether a batch can be deduplicated. Reports events carrying no id at all, ids that repeat with an identical payload - a redelivery a consumer must be idempotent about - and, separately, ids that repeat with a different payload, which means the id is not identifying the event. Volatile fields such as a delivery timestamp can be excluded from the comparison without being excluded from the duplicate detection. Pay 110000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| event_schema_compatibility | Decide whether an event schema registry change breaks anyone. Compares every event type across two registries and classifies each change by the audience it breaks. An event has one producer and many consumers, so both directions are assessed and the strict reading is the default: a consumer cannot be assumed to tolerate a new enum value. A removed event type is breaking for whoever subscribed to it. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| event_sequence_integrity_audit | Find gaps, duplicates and ordering violations in an event sequence, per stream. Partitioning matters: auditing a merged multi-stream batch as one sequence would report a gap at every interleave. Gaps are judged on sequence values and ordering on arrival order, because they are different questions. A non-integral sequence is reported as unchecked for contiguity rather than guessed at. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| event_version_drift_audit | Find out how many versions of each event type are actually in flight. Reports a type arriving at more than one version in a single batch, which means every consumer must handle all of them at once, versions outside the set you support, and supported versions nothing produces - handling carried for nothing is still a cost. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| foundry_outcome_router | Use when you need an outcome and do not already know which zFinia utility to call. Send objective (aliases: goal, task, outcome, query) plus inputs. Top-level colour/field/html/cursor keys fold into inputs. tools/call quotes first and returns PAYMENT_REQUIRED for an already-live x402 resource at that resource's unchanged price (contrast 1000, DCC 3000, catalog-offer 100000, changes-since 10000). Batches are sequential pays on those same live rails. POST /v1/router/quote is unpaid. No URL fetching. MCP does not pay. GET /v1/router for the free contract. | Not declared |
| fx_conversion_consistency_audit | Check that converted amounts follow from the rates supplied. The converted figure is the exact product rounded once to the target currency minor unit under the stated mode, and a difference is reported with its exact size, because one unit is a rounding choice and a thousand is a wrong rate. Also reports two rates for one pair on one date, which means two sources. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| github_actions_workflow_audit | Audit one GitHub Actions workflow against a contract the caller states. The finding that needs two parts of the file at once: a privileged trigger such as pull_request_target together with a checkout of the contributor ref, which runs untrusted code with the base repository secrets. Also reports an action pinned to a mutable tag, a secret or author-controlled event field interpolated into a run command, an absent permissions block, and the trigger key read as a boolean. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| github_actions_workflow_diff | Compare two GitHub Actions workflow files and report what the change grants or removes. Permission scopes are ranked none, read and write, so a widening is reported and a narrowing is noted: only one of them grants something new. Also reports a privileged trigger added, a trigger removed, a permissions block removed so a default set elsewhere applies, an action moved from a commit to a mutable tag, an action version change, and a job removed so whatever it checked no longer runs. Pay 170000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| graphql_audience_risk_audit | Report which parts of one GraphQL schema can no longer change without breaking somebody. The central finding is an enum reachable as both an output and an input: adding a value breaks clients that switch on it and removing one breaks callers that send it, so there is no safe change in either direction. Also reports a deprecated non-null field, which cannot be removed until a separate release makes it nullable, and counts the fields already frozen by a non-null promise. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| graphql_client_impact_audit | Decide which named consumers a GraphQL schema change affects. Each consumer declares the parts of the schema it depends on, as Type.field and Type.field(argument), and the response says per consumer whether it is affected and exactly which dependency broke. A declared dependency the previous schema does not define is reported as not compared, not as unaffected. A new required input field is reported once against the schema, since it affects every consumer sending that input. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| graphql_schema_audit | Audit one GraphQL schema and separate what stops it building from what is legal and costs something. Reports a type implementing an interface without declaring its fields, a reference to an undefined type, a union member that is not an object type, an interface nothing implements, and an absent query root. Separately reports a nullable list item type, which forces every client to handle three outcomes, and a deprecation with no reason. Unreachable types are named as dead weight. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| graphql_schema_compatibility | Decide whether two GraphQL schemas are compatible, with every finding attributed to the audience it affects. Clients break on a removed field, a removed enum value that is returned, a new required argument, a non-null output turned nullable and a new required input field. Servers break on a new field to resolve, a new interface obligation and an output turned non-null. An enum removal is attributed by where the enum actually flows, computed from the roots. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| helm_values_contract_audit | Audit a Helm values file against a contract the caller states, and optionally against a second environment. Reports a required path absent or null, so the chart renders with its own default instead; a value whose type is not what was declared, naming the YAML cause where there is one; a value outside a permitted set; a path the contract does not mention, which Helm ignores silently so a typo never surfaces; and a path stated in one environment and not the other. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| html_evidence_pack | Extract one supplied HTML document into machine-readable evidence and cross-check it against itself. Returns title, metadata, canonical, robots directive, JSON-LD, resolved links, tables, readable text and content hashes. Reports a canonical that disagrees with the URL served, an Open Graph title that disagrees with the document title, a noindex directive, and absent title, description or structured data. Scripts are not executed and nothing is fetched. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| html_snapshot_diff | Compare two supplied HTML snapshots and separate markup churn from a content change. Reports markup that changed while the readable content did not, which is a template or build change; the readable lines added and removed; and changes to the title, canonical, robots directive, meta values and declared structured-data types. Content is compared by line presence rather than position, so a reflowed paragraph is not reported as wholly rewritten. Nothing is fetched. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| http_header_contract_audit | Audit one set of response headers against a contract the caller states: headers that must be present, headers that must not be, and exact, prefix or substring rules on values. Also reports a header repeated with different values, where which one a client uses varies; an absent Content-Type, which forces a client to sniff; and a textual Content-Type with no charset. Optionally reports absent cache directives and no validator at all, which makes a conditional request impossible. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| iam_policy_diff | Compare two IAM policies and report what the change grants or removes. The comparison is over action-and-resource pairs rather than over statements, so a refactor that splits one statement into three reports no change. A newly written pair already covered by a broader unconditioned pattern is noted rather than reported, since nothing new is granted. A removed Deny is reported as a widening even when no Allow changed, because a Deny overrides every Allow. Pay 190000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| iam_policy_evaluation | Decide whether specific calls are permitted by a set of IAM policies, following IAM evaluation order: an explicit Deny wins over every Allow, and the absence of an Allow is a denial because there is no implicit allow. A request allowed or denied only under a Condition is reported as undetermined rather than decided, because the condition depends on a request context that is not supplied. A NotAction or NotResource statement is named as not evaluated rather than silently skipped. Pay 240000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| iam_policy_structural_audit | Audit one IAM policy and report what widens it. The findings that need the document read as a whole: a wildcard action together with a wildcard resource, which means more than either alone; a Deny whose resource patterns no Allow in the policy covers, so it constrains nothing it appears to; and NotAction or NotResource in an Allow, which defines the permitted set by exclusion so the policy widens whenever the cloud gains an action, without the document changing. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| incident_timeline_audit | Derive incident durations from a timeline and report what makes them unreliable. The finding that matters: a phase recorded before the phase that must precede it, which means a time was backfilled, so every duration derived from the pair is fiction. Also reports a time with no UTC offset, which during an incident means somebody wrote their own zone; a missing phase, so a duration cannot be derived; an unrecorded gap of an hour or more; and a derived duration beyond a target the caller states. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| invoice_arithmetic_audit | Recompute an invoice exactly and report where it disagrees with itself. Quantity times unit price is an exact decimal product. Rounding happens only where the stated policy says: per line, or once on the whole invoice. Those give different totals, so the difference between the two policies is published rather than one being assumed correct. Also reports a figure with more decimal places than its currency has, and a discount larger than its line. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_contract_audit | Validate a JSON document against a schema you supply and get the exact pointer and clause of every failure. Reports what it could not check as well as what failed, so a valid verdict always means every declared constraint was actually evaluated. Patterns run on a non-backtracking engine, and no reference is ever fetched. Pay 80000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_field_coverage_audit | Find out which fields your real payloads actually populate. Across a batch of documents it reports, per location, how often it is present, how often it holds anything, and every type it appears as. A location that is a string in some documents and a number in others is named, which no schema check on a single payload would reveal. Pay 90000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_object_reconciliation | Reconcile two sets of JSON records joined on pointers you nominate. Reports keys present on one side only, keys duplicated on either side, and every value disagreement with its key and pointer. Arrays inside records compare as multisets by default and numbers compare exactly, so reordered lists and reformatted amounts are not false findings. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_patch_safety_audit | Judge an RFC 6902 patch against the document it will be applied to. The patch is applied to a copy as a sequence, so each operation is judged against the state it will actually see rather than against the original: a later operation targeting a path an earlier one removed is the defect class this exists for. Reports a missing target, which makes the whole patch fail; a remove, which has no inverse; a replace that changes type; a move into itself; and a path the caller marked protected. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_schema_compatibility | Decide whether a schema change breaks your clients, and which ones. Classifies every change by the audience it breaks: producers construct the payload, consumers read it. Adding a required field breaks senders; adding an enum value breaks readers. A change it cannot classify is reported as unclassified and never counted as safe. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_schema_migration_impact | Decide whether a schema change is safe to ship, with evidence. Returns the compatibility verdict for your clients and, separately, how many of the real payloads you supply would newly be rejected, with the failing constraints ranked by how many payloads each costs. A breaking change nothing relies on is a different decision from one that rejects a tenth of your traffic. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_snapshot_diff | Compare two JSON documents and get every change with its pointer, classified as added, removed, retyped or revalued. Object key order is not a change. Array order is, unless you say the arrays are unordered. Numbers compare exactly, so 42.50 and 42.5 are the same value and two adjacent large integers are not. Pay 60000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| json_structural_drift | Compare a batch of documents against one reference document and report where the shape drifted: locations the reference has that the batch lacks, locations that changed type, and locations the batch added. Array indices are generalised, so a two-item list and a three-item list are the same shape. Useful when you have an example payload and no schema. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| jsonl_contract_audit | Audit a whole NDJSON batch against one schema in a single call. Returns the failing line number and pointer for every breach, the count of valid, invalid and unparseable lines, and the first failing line. A blank line between records is reported rather than skipped, because it is almost always a producer bug. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| key_coverage_audit | Find out which keys every system holds and which only some do. Takes several datasets at once and returns a coverage histogram plus the keys present in only one and the keys partially covered, naming which datasets each is missing from. A pairwise comparison cannot express "present in three of five", which is the question when several systems are meant to hold the same population. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| kubernetes_manifest_audit | Audit a set of Kubernetes manifests against a contract the caller states. Reports an image with no tag or the latest tag, which changes under you; absent resource requests or limits; absent readiness or liveness probes; a missing required label; hostNetwork, hostPID, a hostPath volume or a privileged container; and a credential-shaped environment variable set to a literal, whose value is never echoed. YAML parsing surprises are reported rather than inherited. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| kubernetes_manifest_contract_audit | Audit Kubernetes manifests against a contract. Reports a missing memory limit, where one container can take down the node it shares, a missing readiness probe, where traffic arrives before the container is ready, an unpinned image tag, a privileged container, added capabilities, a secret written literally into an env value rather than a valueFrom reference, and missing required labels. A CronJob’s nested pod template is read correctly rather than reported as having no containers. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| kubernetes_manifest_diff | Compare two sets of Kubernetes manifests and report what applying the second will actually do. Objects are matched the way an apply matches them, by apiVersion, kind, namespace and name. Reports a change to a field that is immutable for that kind, where an apply fails and the object must be deleted and recreated; a change under the pod template, which recreates every pod; a replica change; an object that is gone, which an apply does not delete; and a change that recreates nothing. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| kubernetes_resource_coherence_audit | Parse every Kubernetes resource quantity exactly and report the pairs that contradict themselves and the totals that exceed a quota. Reports a request above its own limit, which the API server accepts field by field and rejects as a pair; a memory value with a decimal SI suffix rather than the binary one; a memory value with no suffix, which is bytes; a CPU limit written with M rather than m; and requests across the set that exceed a supplied namespace quota. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| kubernetes_service_selector_audit | Match every Service selector in a set of Kubernetes manifests against the pod template labels of every workload in the same set. Reports a Service whose selector matches no supplied workload, which has no endpoints so every request to it fails to connect; a targetPort no matched container declares, which fails at connection time rather than at apply time; and a workload whose own selector does not match its own pod template, which the API server rejects. Pay 190000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| link_graph_audit | Build the internal link graph from a set of supplied pages and report its structure. Names pages with no inbound link, pages unreachable by following links from the declared entry points, internal links pointing outside the supplied set, and links that do not resolve at all. Fragments are stripped, since they identify a position rather than a page. Nothing is fetched, so a link to a page that exists and was not supplied is reported as not in the set rather than as broken. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_file_diff | Compare two versions of a base locale and report which translations went stale. A base string edited without its translations being edited leaves every locale confidently wrong, nothing in the translation file marks it, and the diff is the only place it is visible. Also reports a removed key, where anything still referencing it shows the key in the interface; translations still carrying a removed key; and, per locale, how many of the new keys are outstanding. Pay 170000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_key_coverage_audit | Compare keys across locales, separating the three states a single completeness figure hides. An absent key shows the base string, the key itself or nothing, depending on the loader. An empty value satisfies a completeness count and renders nothing, which is how a blank interface passes a translation report. A value identical to the base is either untranslated or a loan word, and nothing says which, so the ambiguity is stated. Also reports a key no base locale defines. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_key_usage_audit | Compare a locale file with the keys the code actually references. Reports a key nothing references, which is translated on every release and shown never, and a referenced key the file does not define, which shows the key itself in the interface. A key built at run time cannot be found by any scan, so the caller declares its prefix and those keys are excluded with the exclusion recorded. The reference list is the caller’s, and nothing is scanned here. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_layout_risk_audit | Measure how much longer or shorter each translation is than its base string. A translation much longer than the base overflows or truncates in a layout built to the base length; one much shorter is usually content that did not make it across, and both are reported with the ratio. Length is counted in code points, so an emoji is not counted twice, and a short absolute difference is never reported however large the ratio. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_nesting_contract_audit | Audit the key structure of a locale file against a contract the caller states. Reports a message that is also the prefix of another message, which a loader nesting on the separator cannot hold both of so it keeps one and drops the other; two keys differing only in case, which is two keys to the file and one to any case-insensitive platform; a doubled separator, which resolves to a different key than written; and whitespace in a key, which several loaders trim or reject. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_placeholder_contract_audit | Compare placeholder structure across locales. A placeholder missing from a translation renders blank in some frameworks and throws in others, so the same file is a cosmetic bug in one stack and a crash in the next. ICU braces, printf conversions and mustache pairs are all recognised. Also reports a placeholder no base string supplies, a positional count that differs, a syntax that differs between locales, and unindexed printf placeholders reordered by a translation, which the renderer ignores. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_plural_coverage_audit | Check that every plural message covers the categories its language actually uses. A language with six categories given two has no message at all for the other four, and the usual fallback is the key itself appearing in the interface. Both suffixed keys and ICU plural blocks are read. Also reports a declared category the language never selects, so the text is translated and never shown, and an ICU plural with no other branch, which the format requires. The category table is published. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| locale_text_safety_audit | Read the characters in a locale file rather than its structure. Reports a bidirectional control character, which is invisible in every editor and reorders everything after it including text nobody touched; a zero-width character, which still counts toward a length limit; text not in NFC form, which compares unequal to the same text typed differently; and markup appearing only in a translation, where the call site was written for plain text. Pay 170000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| lockfile_change_report | Compare two lockfiles and report what a manifest diff cannot see. Reports newly installed transitive packages, resolved version moves with breaking risk, a registry that changed, and the most serious finding available here: the same version with a different integrity hash, meaning the artifact behind a version that was supposed to be immutable is not the one that was there before. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| log_schema_contract_audit | Audit newline-delimited JSON logs against a contract, and across the whole set. The two findings that need every line at once: a field whose type varies between lines, so an index either rejects the minority or coerces them silently; and a message field with nearly as many distinct values as lines, which is interpolated rather than templated so nothing groups and cost scales with volume. Also reports absent required fields, a level differing only in case, and a timestamp with no offset. Pay 190000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| machine_economy_changes_since | Return curated machine-economy developments covering x402 and agent commerce after a supplied cursor or since value. This delta feed includes material additions, corrections and retractions with provenance and nextCursor for caller-managed polling; an empty result is valid. No transaction feed, built-in scheduler, generic web search or exhaustive ecosystem monitoring. Pay 10000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mail_authentication_coherence_audit | Read an SPF record, a DMARC record and a set of DKIM selectors together, and report the combinations that defeat themselves. Every finding needs two or three records at once, which is why a single-record checker finds none of them: a reject policy with no usable selector, an enforcing policy over an SPF record ending in +all, strict alignment with subdomain senders, enforcement with no reporting address, and a subdomain policy that no sending path can satisfy. Pay 240000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mapping_contract_audit | Audit a lookup table against its contract. The finding that matters most: one source mapping to several targets, because a lookup built from it is not a function and whichever row is read last wins. Also reports required sources that are unmapped, so anything carrying them falls through, targets outside the permitted set, and - when a one-to-one mapping is declared - a target reached from several sources. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_agent_readiness_audit | Find out whether an agent can actually choose correctly within a toolset. Reports pairs of tools whose words overlap enough to be confusable, descriptions too short or too empty to distinguish, undescribed arguments an agent must guess at, tools with so many arguments they are filled wrong, state-changing tools with no annotation hints, and the total size of the manifest, which occupies the model context on every turn. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_breaking_change_report | Decide whether an MCP server update breaks its callers. Classifies each change by direction: an agent produces the tool call and consumes its result, so an input-schema change breaks callers while an output-schema change breaks whatever reads the result. Also reports a tool that stopped declaring readOnlyHint, which is a consent change no schema diff would surface. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_capability_surface_diff | See how an MCP server’s advertised capability surface changed. Reports capabilities and features added or removed, and the shift in the aggregate annotation surface: how many tools declare themselves read-only, destructive, idempotent or open-world. That total governs what a client may let an agent do without asking a human. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_required_argument_drift | See which tool arguments changed obligation between two MCP manifests. Separates tightening, where every existing call now fails, from loosening, where a tool may be invoked without something it previously demanded. A newly required argument is the single change most likely to break an agent that was working yesterday. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_tool_call_fixture_validation | Validate a suite of recorded tool calls against the current MCP manifest and get the failing call index, tool and pointer for each breach. The regression gate for a team that keeps recorded calls as fixtures: after a server update, this says which fixtures no longer satisfy the tools they call. Nothing is executed. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_tool_input_coverage_audit | Find out which tools and arguments your agent actually uses. From a transcript of recorded calls, reports which declared tools were never called, which declared arguments were never sent, which arguments always carry the same value, and any call to a tool the manifest does not declare. Nothing is executed. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_tool_name_collision_audit | Check whether several MCP servers can be mounted together. Reports tool names declared by more than one server, which is an ambiguity no prompt can resolve, and pairs of differently named tools whose words overlap enough that an agent will confuse them. Optionally enforces a server-name prefix convention. Pay 90000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_tool_schema_audit | Audit one MCP toolset for the defects that stop an agent calling it correctly: a missing or non-object inputSchema, an argument with no type or no description, a required argument the schema never declares, a duplicated tool name, contradictory annotation hints, and a tool whose name reads as state-changing while declaring no hints at all. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mcp_toolset_diff | See which tools were added, removed or altered between two MCP manifests, and in what respect. Reports a changed description as a change in its own right, because the description is the text an agent reasons over when choosing a tool: editing it can change behaviour with no schema moving at all. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| merchant_contract_regression_report | Compare supplied baseline/current merchant API contracts for CI review. Returns a structured diff report with hashes, remediation, route/method checks, network/asset/payee policy checks, flat input/output compatibility and declared current price against the buyer maximum. No URL fetching, live or future-price guarantee, security audit or CI enforcement. Pay 50000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| metric_naming_contract_audit | Audit metric names, types and label sets. The finding that needs the whole set: a metric appearing with different label sets, so a sum or average over it groups by whichever labels happen to be present, which is not the grouping anybody asked for. Also reports a counter without a total suffix, a gauge named like one, a sub-second unit where the convention is seconds, a label holding identifiers, which is unbounded cardinality by construction, and a label reserved for another metric type. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| mta_sts_policy_audit | Audit an MTA-STS policy against the MX hosts it is meant to authorise. Reports an MX host no pattern matches, which under enforce mode refuses every message to that host; testing or none mode, where nothing is enforced; a max_age under a day, where a receiver that cannot fetch the policy stops honouring it almost immediately; and a DNS record with no id, without which a cached policy is never refreshed. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| numeric_distribution_drift | Compare numeric columns between two datasets on five order statistics: minimum, lower quartile, median, upper quartile and maximum. Quantiles are read off exactly sorted values, so a large or high-precision amount is never collapsed. Values that are not exactly comparable numbers are excluded and the exclusion is reported, because a silently narrowed sample makes every figure below it wrong. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| oauth_client_registration_audit | Audit an OAuth client registration. Reports a wildcard redirect URI, where any matching host receives authorization codes; a plaintext redirect outside loopback; a registered URI that carries its own redirect parameter, so a code can be forwarded off the client's origin while still matching; the implicit and password grants; a public client registering a grant that needs a secret; and a client secret committed into the registration document itself. No secret value is ever reported. Pay 300000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| on_call_coverage_audit | Check that an on-call rota covers a period with no gap. Coverage is the union of the shifts in a rotation, so a gap is reported only where no shift covers the moment at all, which no per-shift check can find. Also reports one person on two rotations at once, where a page to both reaches one person so the second rotation is not a second responder; a shift longer than a stated maximum; too little rest between shifts; and a time with no UTC offset, which leaves a gap at every handover. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_auth_surface_diff | See how the declared authentication surface changed between two OpenAPI documents. Reports schemes added, removed or altered, scopes gained or lost, and the two cases a scheme comparison alone misses: an operation that now requires authentication where it required none, and an operation that no longer requires any. Reports what the documents say, not what the implementation enforces. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_breaking_change_audit | Decide whether an API change breaks your clients, operation by operation. Compares parameters, request bodies, responses and security across two OpenAPI documents, and classifies each change by who it breaks: the clients that call the API or the clients that read its responses. A newly required parameter breaks callers; a widened response enum breaks readers. A change it cannot classify is never counted as safe. Pay 250000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_client_breakage_report | Find out what an API change breaks for one named client, rather than for everyone. You declare the operations it calls and, optionally, the response fields it reads and the parameters it sends. Changes outside that usage are counted and set aside. A breaking change on an operation this client never calls is somebody else’s problem, and blocking a migration on it is the mistake this product exists to prevent. Pay 300000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_endpoint_inventory_diff | See which operations were added, removed, deprecated or renamed between two OpenAPI documents. Flags a removal that was never preceded by a deprecation, an operationId change that renames the method in every generated client, and a duplicated operationId that no generator can resolve. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_parameter_contract_audit | Audit a real request against the OpenAPI document it should satisfy. Matches the operation the way a router would, checks every path, query and header parameter against its declared schema, validates the body against the declared media type, and reports whether the credential the declared security scheme expects is present. You supply the request, so this works against an API nothing external can reach. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_required_parameter_drift | See which parameters and request bodies changed obligation between two OpenAPI documents. Separates tightening, where an existing caller now fails, from loosening, where a handler may now receive nothing it previously could not. A path parameter is treated as required whatever the document says, so moving one between optional and required is not reported as a change. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_response_conformance_audit | Audit a real response against what the OpenAPI document promises for that operation. Resolves the declared status exactly, by range such as 2XX, or through default, checks declared response headers are present, and validates the body against the declared schema for its media type. Catches an implementation that has drifted from its own published contract. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_spec_quality_audit | Audit one OpenAPI document for whether a client or documentation generator can actually work from it. Reports operations with no operationId or description, duplicated operationIds that no generator can resolve, parameters with no schema or no location, responses with no description, and security requirements naming a scheme the document never defines. Pay 80000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| openapi_status_code_contract_drift | See how declared response statuses changed per operation, and which operations are missing the statuses you require. Reports statuses added and removed, operations declaring no 2xx response at all, and responses with no description. Useful when a client has exhaustive error handling that a silently added status will fall through. Pay 90000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| package_manifest_audit | Audit a package manifest for what it leaves unpinned and undeclared. Reports a wildcard or latest specifier that accepts the next breaking release, a git or file specifier whose contents can change without the manifest changing, a version that is not an exact semantic version, missing engines, a dependency declared in both a runtime and a development group, and empty scripts. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| page_fingerprint | Fetch a reviewed public page and return SHA-256 hashes of both the raw HTML and the visible text, with byte and character counts. Two hashes because they answer different questions: the HTML hash moves when anything at all changes, the text hash moves only when the content a reader would notice does. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| page_json_ld | Fetch a reviewed public page and return every JSON-LD structured-data block it declares, parsed. No script is executed. A block that is malformed is reported as a named warning rather than being silently dropped, so a caller can tell an empty page from a broken one. Pay 5000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| page_links | Fetch a reviewed public page and return its links with resolved absolute URLs and anchor text, the canonical URL, the declared meta robots directive, and how many links leave the host. Relative hrefs are resolved against the page, so a caller never has to guess a base. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| page_markdown | Fetch a reviewed public page and return its readable content as Markdown, with headings and list structure preserved. Script, style and template content is removed, and nav and aside elements plus anything marked role="navigation" are excluded from the text. Returns the licence and creator, because this content is reusable only on those terms. Truncation at any bound is reported, never silent. Pay 6000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| page_metadata | Fetch a reviewed public page and return its title, every meta and Open Graph tag, and the canonical URL. No JavaScript is executed and no script content is read. Returns the licence and creator for the content alongside it, so reuse terms travel with the result. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| page_tables | Fetch a reviewed public page and return its HTML tables as arrays of rows and cells. Bounded to ten tables, fifty rows each and twenty cells per row, and every bound that is reached is named in the warnings so a truncated table is never mistaken for a short one. Pay 6000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| pagination_contract_audit | Audit a pagination contract for the ways it loses or repeats rows. The central finding is the one almost every paginated API has at first: a sort on a non-unique field with no unique tiebreaker, so rows that compare equal have no defined order and a caller walking the pages can get one row twice and never get its neighbour, with nothing failing. Also reports offset pagination over a mutable sort, an unbounded page size, contradictory bounds, and a cursor contract that also takes an offset. Pay 240000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| payment_allocation_audit | Check that payment allocations are arithmetically consistent with the invoices and payments they refer to. An over-allocated invoice and an over-allocated payment are reported separately because they are different events: money applied beyond what was owed, and money applied that was never received. Also reports an unallocated remainder, an allocation to a cancelled invoice, and a cross-currency allocation, which converts at a rate the data does not state. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| pii_shape_audit | Report personal-data shapes in structured logs, by field and class and never by value. A payment card is confirmed by the Luhn check and an account number by its own mod-97 checksum, so a match is a plausible real value rather than any digit run, which keeps an order number from being reported as a card. A date of birth needs a field named for one as well as a date. Each match reports its field, how many lines carry it and how many distinct values there are. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| protobuf_schema_audit | Audit one .proto source for what protobuf rejects and what it will cost later. Reports an absent syntax line, which silently means proto2; a required field, which can never be removed; an enum with no zero value, so an unset field has nothing to read as; a zero value named after a real state; a duplicate number; a number inside the implementation-reserved range; a non-permitted map key; and a repeated field above the one-byte tag boundary while low numbers are free. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| protobuf_schema_compatibility | Decide whether two .proto sources are compatible, treating the field number as the identity it is. Reports a number freed without a reserved entry, which arms a future field to reinterpret old bytes; a number taken from a reserved range; a wire type change, which stops old messages decoding; a same-wire-type change that alters the decoded value, such as signed to unsigned; a rename, which is wire-safe and breaks generated code; cardinality and oneof moves; and enum number changes. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| public_catalog_offer_evidence | Extract schema.org Product JSON-LD structured data from caller-supplied authorized public product-page HTML. Returns deterministic normalized Product/Offer JSON, including supplied price and currency when present, with source HTML and record SHA-256 hashes. Performs no URL fetching or browser execution; hashes do not prove authenticity and supplied prices may be stale. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| referential_integrity_audit | Check that every reference in a child dataset resolves to a parent. Containment is one-directional, which is the difference from a reconciliation: a parent key nothing references is normal and is reported as a count, while a child key with no parent is a broken reference reported with every row carrying it. Also catches a duplicated parent key, which makes any reference to it ambiguous. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| resource_tag_contract_audit | Audit a resource inventory against a tagging contract. The finding that spans the inventory: two tag keys differing only in case, which cloud APIs treat as different keys so every grouping and cost report splits silently across them. Also reports a required tag absent, an empty value that satisfies a presence check and carries no information, a value with surrounding whitespace that groups separately, a value outside a permitted set, and a value a declared pattern does not accept. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| revenue_recognition_schedule_audit | Check that a revenue recognition schedule sums to its contract value exactly and covers its term with no gap or overlap. A cent either way means that amount is either never recognised or recognised without having been contracted, and both are reported with the exact figure. Periods are treated as inclusive day ranges, so the day after one ends is the day the next must begin, and a gap and an overlap are separate findings because they are opposite errors. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| reverse_dns_consistency_audit | Check the address, reverse name and forward address triple that receivers actually evaluate. Reports an address with no reverse name, which many receivers refuse before the message body is sent; a reverse name that resolves to a different address, so forward confirmation fails, which is worse than having none because it looks configured; a provider-generated name; and a HELO that does not match the reverse name. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| sbom_component_diff | Compare two software inventories and report what entered, left and moved. Reads CycloneDX components and SPDX packages, matching by package URL where both sides carry one because a bare name matches the wrong component across ecosystems. Reports version moves with breaking risk, a declared licence that changed, and a new component declaring no licence. A licence change is reported as a change in a declared field, not as a licensing conclusion. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| secret_shape_audit | Report credential-shaped values in supplied configuration, by shape class and position, never by value. Recognises a PEM private key block, a JSON Web Token whose header actually decodes, documented key prefixes, a URL carrying a password, and a long run with the character mix of a generated key rather than of text. Also reports a field named like a credential whose value matches no listed shape. The shape classes are published in every response. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| security_header_diff | Compare a fixed list of ten security-relevant response headers across two releases and name the specific reverts. Reports a header removed, added or changed, and separately a reduced Strict-Transport-Security max-age, dropped includeSubDomains, a newly permitted unsafe-inline or unsafe-eval, and a Content-Security-Policy that moved from enforcing to report-only so it no longer blocks anything. Observable differences only, not an assessment of whether either configuration is adequate. Pay 110000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| sitemap_contract_audit | Audit one supplied sitemap or sitemap index. Reports entries with no loc, locations that are not absolute URLs, locations on an unexpected host, duplicated locations with the entries they occupy, fragments, unescaped ampersands that make the document invalid XML, double-escaped ampersands that name a URL which does not exist, and lastmod values that either are not W3C datetimes or match the shape without being real dates. No URL is fetched. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| slo_definition_audit | Judge whether a service level objective can actually be observed, before any measurement exists. The central check: at the expected event volume, one failure may already exceed the whole budget, so the objective is met with zero failures and breached by one and measures nothing in between. Also reports a budget of fewer than ten events, where chance dominates service quality, and a burn-rate alert whose own window is longer than the time that burn takes to exhaust the budget. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| slowly_changing_dimension_integrity | Check that a versioned dimension is temporally coherent, per key. Reports intervals that overlap, so a point-in-time lookup returns two rows; gaps, so it returns none; more than one live version; an interval ending before it starts; and a current flag that disagrees with its own interval. Intervals are treated as half-open, so a row ending exactly where the next begins is contiguous rather than overlapping. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| span_attribute_contract_audit | Hold spans to an attribute convention the caller states, including per span kind. The finding that matters most: a span name embedding an identifier. The name is the aggregation key, so a name per call means every call is its own operation and no latency distribution exists for it; identifiers belong in attributes. Also reports a required attribute absent, an attribute the contract forbids, reported by key and never by value, and an unrecognised span kind. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| spf_include_budget_audit | Compute the exact SPF lookup cost across a supplied include tree. The budget of ten resolving mechanisms is shared across the whole evaluation rather than per record, which is why a record with three includes can cost fourteen lookups and no single record looks wrong. Reports the total against the limit, the headroom left, a cycle in the include chain, and every include whose record was not supplied so the total is a floor. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| spf_record_audit | Audit an SPF record. Reports two or more records on one name, which is a permanent error so most receivers treat the domain as having no SPF at all; a lookup count at or beyond the limit of ten resolving mechanisms, beyond which the evaluation is a permanent error; a record ending in +all, which authorises every host on the internet; a record ending neutral with no all or redirect; a term after all, which is never evaluated; and an unrecognised term, which is itself a permanent error. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| sql_ddl_compatibility | Compare two SQL schema snapshots and report what would break a client written against the first. Separates reader breakage from writer breakage, because the same change breaks different people: a dropped column breaks whoever selects it, a new NOT NULL column with no default breaks every existing insert. Also reports narrowed and widened types, lost defaults, nullability flips, collation changes and added or removed uniqueness. Pay 280000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| sql_migration_blast_radius | Read migration statements and report what each one touches and what it costs. Names the statements that rewrite a table, the ones that scan every row while holding a lock, the ones that discard data irreversibly, and the renames that break every client still deployed with the old name the instant they commit. Reports tables and columns touched so a reviewer can see the reach of a migration without reading every statement. Pay 300000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| structured_data_contract_audit | Audit the JSON-LD a supplied page declares against a contract the caller states. Entities inside @graph and nested inside other entities are flattened first, because reading only the top level misses every entity a real page declares that way. Reports required types absent, required properties missing per entity, unmentioned types when unknown types are forbidden, entities with no @type, and blocks with no @context. Only JSON-LD is read, and that is stated rather than treated as conformant. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| tabular_contract_audit | Audit your own delimited data against a contract you declare, and get one pass/fail plus the exact row and clause of every breach. Checks types, required values, enums, numeric bounds, lengths, patterns, uniqueness, composite primary keys, null-rate ceilings, header drift and encoding damage in one pass. A pass means the audit was complete and nothing broke, so a file beyond the bounds reports incomplete rather than passing. Nothing is fetched: you supply the rows. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| tax_computation_audit | Check tax amounts against a rate schedule the caller supplies. When a declared amount disagrees, the other inclusivity formula is tried too: if that one gives the declared figure, the finding says the policy and the data disagree rather than that the arithmetic is wrong, which is a different correction. Also reports a code absent from the schedule, a line rate disagreeing with it, and an amount too precise for the currency. Not tax advice. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| telemetry_attribute_contract_audit | Audit telemetry attributes against a contract, and against the thing a schema cannot see: cardinality. Reports missing required attributes, undeclared attributes, an attribute appearing as two types across the batch, and an attribute whose distinct values exceed your limit - because in a metrics backend each distinct value is a separate series, and that is how an index or a bill explodes. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| terraform_plan_blast_radius | Read a Terraform plan and report what applying it destroys. Names each resource to be destroyed or replaced, and for a replacement the attribute the plan says forced it, which is what a caller changes to avoid it. Separates a destroy of a resource type that holds data, where re-applying does not bring it back, from a destroy of something stateless. The type patterns treated as holding data are published in the response and the caller can add to them. Pay 250000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| terraform_plan_change_summary | Summarise a Terraform plan and name everything it would destroy. A replacement is expressed as a create and a delete together, so reading only the first action would report a destroy and recreate as a plain create; replacements are classified as such. Counts changes by action and by resource type, and reports a destroy or replacement of any resource type or address you declare protected. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| terraform_plan_drift_audit | Read a Terraform plan expected to be empty and report why it is not. Drift and planned changes are reported separately, because Terraform records them separately and they answer different questions: one is what somebody changed outside the configuration, the other is what applying would do about it. Where before and after attributes are both present, the fields that actually moved are named rather than reporting the resource as generically drifted. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| terraform_plan_policy_audit | Hold a Terraform plan to a contract the caller states: resource types forbidden or permitted, tags every resource must carry, actions that must not appear, a ceiling on destructive changes, and attribute values that must not be used. Tags are read from tags, tags_all or labels, because providers differ and reading only one would report a tagged resource as untagged. Which rules ran is published, so a contract that checked nothing is visible rather than reading as a pass. Pay 200000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| trace_integrity_audit | Check whether a set of spans forms coherent traces. Reports a parent that is not in the data, so the trace renders as fragments rather than one tree; a trace with no root or several; a cyclic parent chain, which makes any walk loop; a span that ends before it starts; and a child whose times fall outside its parent, which is clock skew between hosts rather than a code defect and which every latency figure derived from the trace inherits. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| translation_memory_conflict_audit | Report text reuse conflicts between a base locale and its translations, in both directions. One source string translated several ways makes the interface say the same thing in different words in different places. Several source strings translated identically removes a distinction the product makes in one language and not the other. Neither is visible key by key, which is why this is a property of a pair of files. Comparison folds case and trims whitespace by default. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| trial_balance_reconciliation | Derive account balances from journal entries and compare them with a declared trial balance. Reports an account whose balances differ, with the exact difference; an account carrying a reported balance that nothing in the journal supports; an account with journal movement that appears in no reported figure; and a trial balance whose own debit and credit columns do not foot. Both a debit and credit pair and a single signed balance column are accepted, because exports are written both ways. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| webhook_delivery_integrity_audit | Audit a webhook delivery log. Reports events that never succeeded and whether they still have retries or have exhausted them and are lost, events delivered more than once so the receiver had to be idempotent, retries issued after a success, and attempts beyond the declared limit. No payload is inspected and no signature or secret is handled. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| website_evidence_pack | Everything a reviewed public page declares, in one call and one fetch: title, meta and Open Graph, canonical, robots directive, JSON-LD with its schema.org types, resolved links with an external count, tables, content fingerprints, and readable Markdown. Replaces six separate extraction calls, and adds the cross-checks none of them can make alone — a canonical that disagrees with the URL you asked for, a page declaring noindex, missing structured data. Pay 50000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_asset_network_compatibility | Find out whether your wallet configuration can satisfy a challenge, option by option. For each accepted payment it says usable or not and why: a network you are not configured for, an asset you do not hold, a scheme you have not implemented, or an amount above your ceiling. Names the cheapest usable option, because a buyer facing several will otherwise take the first one listed. Nothing is paid. Pay 110000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_catalogue_integrity_audit | Check that an advertised catalogue matches the challenges actually served. Reports a resource advertised and not served - a dead listing a buyer follows to nothing - and a resource served and not advertised, which nobody can discover. Compares advertised price, network, asset and payee against what the challenge really says, since a buyer budgeting from a listing budgets wrongly when they disagree. Nothing is paid. Pay 160000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_challenge_batch_audit | Audit a whole set of captured 402 challenges in one call. Per challenge it reports whether a payment can be constructed, which blocking defects stand in the way, whether the resource is bound to the URL it came from, the cheapest accepted amount and the networks offered. A challenge supplied without its URL has its binding reported as unchecked rather than assumed sound. Nothing is paid. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_challenge_decode | Decode an x402 payment challenge before paying: give it the raw 402 body or payment-required header, as JSON or base64, and get back the version, resource, and every accepted payment normalised to scheme, network, asset, amount and payTo. Names what is wrong with named warnings — bad amount, unrecognised network, invalid payTo, unsupported scheme, missing input or output schema — and returns the declared Bazaar schemas. No network call, no payment sent. Pay 2000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_endpoint_health | Is this paid endpoint answering right now? Returns whether it serves a payment challenge, how many well-formed priced offers it carries, which warnings would actually break a payment as opposed to merely making the call harder to construct, and a single payable_now flag. Reports only what was observed; it makes no judgement about the seller. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_endpoint_preflight | Find out what an x402 endpoint will charge before you pay it. Probes the endpoint, reads the challenge from the header or the body, and returns the decoded price, network, asset and payTo plus the declared input and output schemas. Never sends a payment. Only reviewed origins are reachable, and a redirect is refused rather than followed. Pay 4000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_merchant_contract_audit | Audit a merchant estate across all its endpoints at once. The findings that matter are the ones no single-challenge check can see: endpoints paying different addresses, sitting on different networks, or declaring different protocol versions. Also checks each challenge against a contract you declare - expected payee, network, asset, host and price ceiling. Nothing is fetched, so this works on a merchant you do not control. Pay 180000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_merchant_readiness_audit | Is this merchant safe to depend on? Audits up to ten x402 endpoints in one call and returns a verdict — ready, partially ready or not ready — with the specific blockers. Checks each endpoint serves a payable challenge with well-formed terms and a declared input schema, and adds the cross-endpoint check no single probe can make: whether every endpoint pays the same recipient. Never pays anything. Pay 150000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_metadata_drift | Did this paid endpoint change its terms since you last looked? Give it a previous challenge as the baseline and it returns every difference: price changes with old and new amounts, offers added or removed, a protocol version change, and a payee_changed flag when a new recipient address appears. Never pays the endpoint. Pay 6000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_payee_drift_report | Compare two snapshots of captured challenges and report every change of payee. A payee change is the most consequential thing a challenge can do, because paying the new one sends funds to a different recipient. Specifically flags a new payee sharing its first six and last four characters with the old one, which passes a human comparison and is a different account. Reports a change to confirm, never an accusation. Nothing is paid. Pay 140000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_payment_requirement_conformance | Decide whether a captured 402 challenge can actually be paid. Separates defects that stop a payment being constructed from ones that merely make the call harder to get right, and checks the resource is bound to the endpoint that served it - a challenge naming a different resource would, if paid, satisfy a requirement for something else. Also names the price spread when several payments are accepted. Nothing is fetched and nothing is paid. Pay 100000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_price_drift_report | Compare two snapshots of captured challenges and report every price movement per resource. Amounts are compared as exact integers, so a large atomic amount is never collapsed by floating point. Reports a resource that was priced before and is absent after, a rise beyond a tolerance you set, and a new resource that appeared. Nothing is paid. Pay 130000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_resource_binding_audit | Check that every challenge you captured names the endpoint that served it. A challenge naming a different resource would, if paid, satisfy a requirement for something else. A host mismatch is reported differently from a path mismatch, the first being the stronger signal. Also reports a non-https resource and, under version 2, a bare string resource, where a client reading resource.url gets undefined and stops checking the binding. Nothing is fetched and nothing is paid. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_seller_migration_impact | Find out what a seller’s change breaks for one specific buyer. You declare which resources you call and what your wallet supports; changes to anything else are counted and set aside, because blocking your own upgrade on somebody else’s change is the mistake this prevents. Reports a resource you use becoming unpayable by you, moving to an unsupported version, changing payee, or rising in price. Nothing is paid. Pay 220000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| x402_version_compatibility_audit | Find out which x402 versions you are actually dealing with across a set of sellers. Reports challenges declaring a version you do not support, challenges declaring no version at all - where how to read the rest is a guess - and a set spanning more than one version, which means your client must implement each of them at once. Nothing is paid. Pay 110000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| yaml_document_audit | Report what a YAML reader will do with the text supplied, as distinct from whether the data is correct. Reports a duplicate key, which most readers accept while silently keeping the last; an unquoted YAML 1.1 boolean word such as on, off, yes or no, which arrives as a boolean rather than text; a leading zero read as octal; and a two-part version read as a float, where a patch number would change the type. Anchors and merge keys are refused with the line. Pay 120000 atomic USDC on Base via exact x402. MCP does not pay; it provides a challenge handoff. | Not declared |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | zFinia Intelligence | - | 2 Oct 2026 |