{"uid":"cap_BZnW8xHP8PGx1CFEOXl7o","slug":"base-chain-transaction-lookup-x402-4d15cf10","name":"Base Chain Transaction Lookup (x402)","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/api/chain/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_swlltWevqeTb8WPxBqw37","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":"Retrieves detailed on-chain transaction data for a given Base network transaction hash, including transfers, USDC flows, gas usage, and x402 payment verification.","exampleAgentPrompt":"Can you look up Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and tell me whether it was a successful x402 USDC payment and how much USDC was received?","exampleUseCases":[{"title":"Verify x402 micropayment before serving content","prompt":"Before I unlock the premium data, check that Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca actually sent at least 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 and that it's confirmed."},{"title":"Debug failed on-chain payment","prompt":"I sent a transaction on Base with hash 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca but I'm not sure it went through — can you check the status, gas used, and whether any USDC actually moved?"},{"title":"Audit x402 settlement for accounting","prompt":"Pull the full details for Base tx 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca — I need the timestamp, block number, USDC transfers, and confirmation that it was flagged as an x402 settlement for my records."}],"resultDescription":"Returns a JSON object with the transaction's hash, sender, recipient, block number, chain, contract method called, success status, ETH fee, gas used, timestamp, number of confirmations, ETH value, a list of token transfers (including token address, amount, symbol, from/to), a map of USDC received per address, a payment_verified boolean, and an is_x402_settlement boolean.","failureModes":["Invalid or malformed transaction hash (not matching ^0x[0-9a-fA-F]{64}$) returns a validation error","Transaction not found on Base returns a 404 or empty result","Payment not yet confirmed may return payment_verified: false","x402 payment of 0.002 USDC required per call; missing or failed payment returns HTTP 402","Network congestion or RPC timeout may cause transient errors","Providing expect_to or expect_usdc that don't match actual tx data returns payment_verified: false"],"whenToPreferThis":"Use this endpoint when you need to verify or inspect a specific Base chain transaction — especially to confirm x402 micropayment settlement, check USDC transfer details, or validate on-chain state before releasing a resource. Prefer it over block explorers when you need structured, machine-readable output with x402 payment verification flags rather than human-readable HTML pages. It requires no API key and charges only $0.002 USDC per call via x402.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:41:45.383Z","isFirstParty":false,"canonicalSlug":"base-chain-transaction-lookup-x402-4d15cf10"}