MCP server
Plumb Data Exchange
By mlcharle518
Verified table jobs and RPC-free payment verification (Base/Ethereum). Pay per call via x402.
Listed on
First seen 7 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
1
Directories
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12
Tools
From an anonymous probe
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| check_x402_receipt | Free. Cross-check a seller's signed x402 offer + receipt (offer-and-receipt extension): verifies the signatures (official x402 functions; pin the seller with sellerAddress for EIP-712 or sellerJwk for JWS), checks offer and receipt agree, and returns the exact `claim` to prove with verify_payment. Pass that verification's checkId to learn which side failed. | Not declared |
| convert_to_csv | Convert a table to CSV without changing any value; verified by round-trip. Costs $0.05 USDC (x402). | Not declared |
| deduplicate | Remove duplicate rows by exact key, keeping the first or last, and report conflicting columns per group. Costs $0.05 USDC (x402). | Not declared |
| get_job | Free. Status and (once verified) the result of a paid job, using the accessToken its paid call returned. | Not declared |
| get_verification | Free. Current state of a verification by checkId; re-checks it once its retry or challenge time has passed. | Not declared |
| get_verifications | Free. Up to 50 checks at once (re-checked when due), as rows; format "csv" adds a reconciliation CSV. | Not declared |
| reconcile | Compare two versions of a table by key: rows added, removed and changed (with the changed columns). Costs $0.05 USDC (x402). | Not declared |
| try_verify_payment | Free: the same verification as verify_payment, limited to 3 NEW claims per client per day (asking again about a claim already checked is always free). | Not declared |
| verify_payment | Verify an on-chain payment without trusting any RPC: did this tx transfer at least this amount of a token (default USDC) to this payee, optionally from this payer? Proven by Plumb (Base via proof-backed L1 checkpoints, Ethereum via a light client). Bound to the exact transfer (log index); returns the proof level, how long a Base checkpoint can still be challenged, the evidence to re-check, and an Ed25519-signed receipt. Never answers not_paid while a payment is still pending; abstains (unverifiable) whenever the proof is incomplete. Costs $0.02 USDC (x402); asking again about the same claim costs nothing. Optional requiredLevel (releasable or not) and callbackUrl (signed events when the level is reached, the answer changes, or checking gives up). | Not declared |
| verify_payments_batch | Verify up to 25 payments in one call for $0.25 USDC (x402): give `claims` (same fields as verify_payment) or `csv` (header: chain,txHash,payee,token,minAmountRaw,payer,logIndex). Claims already checked cost nothing; if all of them were, nothing is charged. Returns one row per claim (format "csv" adds a reconciliation CSV). | Not declared |
| watch_verification | Free for a PAID check: add a callback (https) that receives signed events when requiredLevel is reached, when the answer changes, when it becomes final, or when checking gives up. The service re-checks on its own. | Not declared |
| what_should_i_build | What should I build? x402 agent demand by category from public chain data (Base USDC + XRPL), with fake demand removed (testers, sellers paying themselves, loops; wallet fleets counted as one buyer) and gaps ranked (repeat buyers per seller). Rolling 7 days, refreshed every 2 h. Signed answer with sample transactions you can check, plus a dashboard link. | Not declared |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | Plumb Data Exchange | - | 7 Oct 2026 |