{"uid":"cap_1C8wfWVoXIFKQHb78C6ry","slug":"proofwork-base-usdc-receipt-verifier-2651293a","name":"Proofwork Base USDC Receipt Verifier","description":"Small non-cyber evidence and data APIs payable per request with x402 on Base.","url":"https://proofwork-the402-webhook.phase-voice.workers.dev/v1/base-usdc-receipt","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","queryParams"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["transaction_hash"],"properties":{"transaction_hash":{"type":"string","pattern":"^0x[a-fA-F0-9]{64}$"},"expected_recipient":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$"},"expected_amount_usdc":{"type":"string","pattern":"^(?:0|[1-9][0-9]{0,11})(?:\\.[0-9]{1,6})?$"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"mode":"inspect","verdict":"observed","evidence":[],"finality":"finalized","observed":{},"confirmed":true,"transaction":{}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_6-udCE07mG2XM37wGtYsg","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies a specific Circle USDC payment on Base mainnet by checking a transaction hash against an expected recipient and amount, returning finalized chain evidence.","exampleAgentPrompt":"Can you verify that transaction 0x4a3b...f9e2 on Base mainnet actually sent 12.50 USDC to wallet 0xAbCd...1234 and confirm it's finalized?","exampleUseCases":[{"title":"Confirm customer payment before service delivery","prompt":"Before I release the digital goods, verify that transaction 0x7f3c2a...d891 sent exactly 49.99 USDC to my wallet 0xDe45...9Abc on Base and that it's finalized."},{"title":"Audit trail for automated invoice reconciliation","prompt":"I need to confirm that the USDC payment for invoice #1042 went through — the transaction hash is 0xA1b2C3...e4F5, expected recipient is 0x1234...abcd, and the amount should be 200.00 USDC on Base mainnet."},{"title":"Dispute resolution for a marketplace transaction","prompt":"A buyer claims they paid 75.00 USDC to 0x9876...fedc on Base — can you check transaction 0xBc12...3dEf and tell me if it's confirmed and finalized so I can settle the dispute?"}],"resultDescription":"Returns a JSON object with a 'verdict' field (e.g. 'confirmed'), a 'confirmed' boolean, a 'finality' field indicating chain finality status (e.g. 'finalized'), an 'evidence' array of supporting on-chain data, and an 'observed' object with raw transaction details. Agents can use 'confirmed: true' and 'finality: finalized' together to conclusively prove payment occurred.","failureModes":["Transaction hash not found on Base mainnet — returns unconfirmed or error verdict","Expected amount or recipient does not match on-chain data — returns verdict indicating mismatch","Transaction exists but is not yet finalized — returns pending finality status","Malformed transaction hash (not 0x + 64 hex chars) — schema validation error","Invalid recipient address format — schema validation error","Amount format exceeds allowed precision or length — validation rejection"],"whenToPreferThis":"Use this endpoint when you need cryptographic, on-chain proof that a specific USDC payment occurred on Base mainnet with exact recipient and amount matching. Prefer it over general blockchain explorers when you need a structured, machine-readable verdict with finality confirmation — ideal for automated payment gating, invoice reconciliation, or dispute resolution in agent workflows where trust in payment receipt must be verifiable without a centralized payment processor.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:36:07.304Z","isFirstParty":false}