{"uid":"cap_mQfsadlkbld3BjOSGjnQs","slug":"base-transaction-lookup-usdc-payment-verifier-4c153667","name":"Base Transaction Lookup & USDC Payment Verifier","description":"Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.","url":"https://kr-x402-mvp.kgy5612.workers.dev/crypto/tx?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["hash"],"properties":{"hash":{"type":"string","pattern":"^0x[0-9a-fA-F]{64}$","examples":["0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca"],"description":"Base tx hash"},"expect_to":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"Optional: payee you expect to receive USDC"},"expect_usdc":{"type":"number","minimum":0,"description":"Optional: minimum USDC amount expected (with expect_to)"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"to":"0xca11bde05977b3631167028862be2a173976ca11","from":"0xc6699d2aada6c36dfea5c248dd70f9cb0235cb63","hash":"0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca","block":53220068,"chain":"base","method":"aggregate3 (Multicall3)","status":"success","fee_eth":6.5e-7,"gas_used":92312,"timestamp":"2026-10-28T23:18:03Z","transfers":[{"to":"0xe4be4d0bd82d8e68203deff81f79ede0529f2617","from":"0xa1d1c0cf717402ff3651aa4873ccf96410b01978","token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","amount":0.002,"symbol":"USDC"}],"value_eth":0,"confirmations":21764,"usdc_received":{"0xe4be4d0bd82d8e68203deff81f79ede0529f2617":0.002},"payment_verified":true,"is_x402_settlement":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_4_3xs77nNvLopUt3p0eLo","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches on-chain details for a Base transaction by hash, including gas used, transfers, USDC amounts received, and whether it constitutes a valid x402 payment settlement.","exampleAgentPrompt":"Can you look up Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and confirm whether it successfully settled at least 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 as an x402 payment?","exampleUseCases":[{"title":"Confirm x402 micropayment before serving response","prompt":"Check Base tx 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and tell me if it's a valid x402 settlement that sent at least 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617."},{"title":"Audit counterparty payment receipt","prompt":"I need to verify that 0xc6699d2aada6c36dfea5c248dd70f9cb0235cb63 actually paid us on Base — can you pull up transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and show me the USDC transfers and whether it succeeded?"},{"title":"Debug failed Base transaction","prompt":"Transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca on Base — can you fetch the status, gas used, and any token transfers so I can figure out what happened?"}],"resultDescription":"Returns a JSON object with the transaction hash, block number, chain, method name, status (success/fail), gas used, fee in ETH, timestamp, number of confirmations, value in ETH, list of ERC-20 token transfers (from/to/token/amount/symbol), a usdc_received map keyed by recipient address, a payment_verified boolean, and an is_x402_settlement boolean.","failureModes":["Invalid or malformed tx hash (not matching ^0x[0-9a-fA-F]{64}$) returns a validation error","Transaction not yet indexed or too recent may return not-found or incomplete data","Transaction exists on a different chain (not Base) will not be found","expect_to / expect_usdc mismatch causes payment_verified=false rather than an error","Network or RPC timeout on the Base node returns a 5xx error","Payment of $0.002 USDC required via x402 — missing payment header returns 402"],"whenToPreferThis":"Use this endpoint when you need to verify a specific Base mainnet transaction by hash, especially to confirm x402 micropayment settlement (payment_verified + is_x402_settlement flags), USDC transfer amounts per recipient, and gas costs — all without needing an API key. Prefer this over a generic block explorer when your agent needs machine-readable JSON with pre-parsed USDC receipt data and x402 settlement confirmation built in.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:41:46.387Z","isFirstParty":false,"canonicalSlug":"base-transaction-lookup-usdc-payment-verifier-4c153667"}