{"uid":"cap_aSwJO06a1btagjGAXlKAD","slug":"base-chain-transaction-lookup-verification-4be0166f","name":"Base Chain Transaction Lookup & Verification","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/transaction?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_lIdpuVI0CF0CG-Gv1GiWG","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 and verifies details of a Base blockchain transaction by hash, including transfer amounts, gas usage, USDC received, and x402 payment settlement status.","exampleAgentPrompt":"Can you look up Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and confirm it successfully sent at least 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617?","exampleUseCases":[{"title":"Confirm x402 micropayment settled","prompt":"Check if the Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca actually settled as an x402 payment and that 0.002 USDC reached address 0xe4be4d0bd82d8e68203deff81f79ede0529f2617."},{"title":"Audit agent payment before proceeding","prompt":"Before I unlock the next step for my trading agent, verify that transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca on Base succeeded and paid at least 0.002 USDC to the expected payee."},{"title":"Debug a failed onchain transfer","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 what tokens were transferred?"}],"resultDescription":"Returns a JSON object with the full transaction record: to/from addresses, block number, chain, decoded method name, success/fail status, ETH fee, gas used, ISO timestamp, token transfer list (including symbol, amount, and addresses), ETH value, confirmation count, per-address USDC received map, a payment_verified boolean, and an is_x402_settlement boolean.","failureModes":["Invalid or malformed tx hash (not matching 0x[64 hex chars] pattern) returns a 400 error","Transaction not found on Base returns a 404 or empty response","expect_to / expect_usdc mismatch causes payment_verified to return false rather than an error","Network congestion or RPC node unavailability may cause timeouts","Very recent transactions with zero confirmations may not yet be indexed"],"whenToPreferThis":"Use this endpoint when an AI agent needs to programmatically verify that a specific Base blockchain transaction occurred, succeeded, and transferred the correct USDC amount to the correct address — especially for x402 payment settlement confirmation. Prefer this over a general block explorer when you need machine-readable JSON with decoded transfer amounts and a payment_verified flag rather than a human-readable UI.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:42:12.597Z","isFirstParty":false,"canonicalSlug":"base-chain-transaction-lookup-verification-4be0166f"}