Official MCP RegistryListed
PayCheck
Score merchant domain, https URL, or 0x wallet trust before an agent pays. Does not send payments.
First seen 15 Oct 2026. Evidence as of 15 Oct 2026.
3
Tools
From an anonymous probe
1
Source listings
Each with its own history
1
Recorded changes
Since first seen
Tools
| Tool | Description | Behaviour |
|---|---|---|
| check_merchant | Decide whether an autonomous agent should pay a merchant, host, or wallet. PayCheck returns a deterministic trust score for one target. It does not send money, does not sign transactions, and does not hold wallet keys. Use this immediately before a payment, a checkout redirect, or a transfer to a new 0x address. Pass the payee as a bare domain (api.openai.com), an https URL, or a 0x address with 40 hex characters. Do not use this tool to execute a payment. Do not use it to overturn a block. Do not call it again with a reworded category, purpose, or amount to fish for a better verdict: those fields are ignored and are not stored. Trusted is returned only for the published allowlist of known AI and developer APIs, served over https on port 443. A new or random domain is never trusted. A wallet is never trusted. Scoring v1 does not analyze on-chain history. If the URL contains an embedded 0x address, this scores the host only and will not return trusted; pass the bare address to score the wallet. Arguments: target (required string); amount_usd (optional number, ignored); category (optional string, ignored); api_key (optional pc_live_ key). You may also send Authorization: Bearer or X-API-Key. Omit the key for the anonymous allowance. Returns: score (integer 0-100), verdict (trusted | unknown | suspicious | block), reasons[], recommended_action (proceed | verify_out_of_band | require_human_review | do_not_pay), signals (host, allowlist, domain age, wallet flags, reason_codes; chain_analysis is always not_in_v1), checked_at (ISO-8601), policy_version ("1"). Free tier: 100 checks per UTC day anonymous, 1,000 per UTC day with a free pc_live_ key or a Toolweather bundle client whose x-tw-bundle-client is hex. A bundle client prefixed anon: stays at 100 per day. The same target for the same caller is idempotent for 60 seconds and does not consume a second check. Over the daily cap, each extra check is $0.001 USDC on Base (eip155:8453) via x402 and the PayAI facilitator. get_quota, get_api_key, docs, and MCP discovery are not billed. If PAY_TO is unset, an over-cap check returns HTTP 402 payment_not_configured. | Changes data |
| get_api_key | Mint one free PayCheck API key. The key looks like pc_live_ followed by hex and raises the merchant-check allowance from 100 to 1,000 per UTC day. Use this once when you set up a long-running agent, then store the key and pass it on later check_merchant or get_quota calls. The plaintext key is returned only in this response. PayCheck stores a SHA-256 hash. Do not call this every turn. Do not call it to score a payee or to dodge a block verdict. Minting is free and is not an x402 check, and it is limited to 10 new keys per caller IP per UTC day. A new key does not change any merchant score. Checks above the free daily cap still cost $0.001 USDC on Base via x402. Returns: api_key, token_type (bearer), daily_limit (1000), prefix, note. | Changes data |
| get_quota | Show how many free PayCheck merchant checks the current caller has left for the current UTC day. Use this before a batch of check_merchant calls, or after an HTTP 402, to read the remaining free allowance and when it resets. Do not use this to score a payee. It accepts no target and it does not consume a check. Do not pay x402 for this tool. It is always free. Identity matches check_merchant. Anonymous IP: 100/day. pc_live_ api_key (api_key argument, Authorization: Bearer, or X-API-Key): 1,000/day. Toolweather bundle headers x-tw-bundle-secret and x-tw-bundle-client: hex client 1,000/day, anon: prefix 100/day, any other client id 100/day. Returns: subject_kind, limit, used, remaining, resets_at (next UTC midnight, ISO-8601), billed (always false), policy_version. No x402 charge. | Read-only |
Change history
- Listed (registry)
| Source | Listing | First seen | Last seen | Versions |
|---|---|---|---|---|
| Official MCP Registry | io.github.toolweather/paycheck | 15 Oct 2026 | 15 Oct 2026 | 1 |