{"uid":"cap_mp_lwLaaEdm76QxDOGDr_","slug":"x402-trust-discovery-api-onchain-transaction-lookup-c454548d","name":"x402 Trust & Discovery API — Onchain Transaction Lookup","description":"Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for \"is this API endpoint a scam\" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.","url":"https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/onchain/tx?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"hash":{"type":"string","description":"0x transaction hash on Base."}}},"responseSchema":{"type":"json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_wGQyLf6iTFzNAeIhcGfNW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Retrieves onchain transaction data from Base by transaction hash, providing keyless settlement history for x402/MPP payment endpoints.","exampleAgentPrompt":"Can you look up the Base transaction with hash 0xabc123... and tell me what the onchain settlement record shows?","exampleUseCases":[{"title":"Verify x402 payment settled onchain","prompt":"I just paid an x402 API and got a transaction hash back — can you check onchain whether that payment actually confirmed on Base? The hash is 0x4f3a2b1c9d8e7f6a5b4c3d2e1f0a9b8c7d6e5f4a3b2c1d0e9f8a7b6c5d4e3f2."},{"title":"Audit API billing history","prompt":"I need to audit our agent's spending — can you pull the onchain transaction record for hash 0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b from Base so I can confirm what was charged?"},{"title":"Debug a failed payment attempt","prompt":"Our automated agent says it submitted a payment but I'm not sure it went through — look up Base transaction 0x9f8e7d6c5b4a3f2e1d0c9b8a7f6e5d4c3b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e and show me what the onchain data says."}],"resultDescription":"Returns a JSON object containing onchain transaction details from Base for the provided transaction hash, including settlement status, payment amounts, and related metadata relevant to x402/MPP payment verification.","failureModes":["Invalid or malformed transaction hash returns an error","Transaction hash not found on Base returns empty or 404 response","Network latency from Base RPC may cause timeouts","Transactions still pending may not yet appear in results","Hash from a different chain (not Base) will return no results"],"whenToPreferThis":"Use this endpoint when you need to verify or audit a specific Base blockchain transaction by its hash without holding wallet credentials. It is particularly useful for confirming x402 or MPP payment settlements, auditing agent spending, or debugging payment flows where you have a tx hash and need onchain ground truth.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T03:29:15.203Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-onchain-transaction-lookup-c454548d"}