{"uid":"cap_AOCw-E6A7xtnnoHiYnrpg","slug":"base-transaction-explainer-x402-payment-verifier-837e724e","name":"Base Transaction Explainer & x402 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/v1/tx-explain?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_Q8ePJE9ko5I-l02xZyRO3","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":"Decodes a Base chain transaction hash into human-readable details including transfers, gas, method called, and USDC payment verification for x402 settlement confirmation.","exampleAgentPrompt":"Can you look up Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and confirm whether it successfully sent at least 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 as an x402 payment?","exampleUseCases":[{"title":"Verify x402 micropayment settled","prompt":"Check Base tx 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and confirm it was a valid x402 settlement where at least 0.002 USDC landed at 0xe4be4d0bd82d8e68203deff81f79ede0529f2617."},{"title":"Audit onchain USDC transfer","prompt":"Decode this Base transaction hash 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca for me — I need to know the sender, receiver, USDC amount transferred, gas used, and whether it succeeded."},{"title":"Debug failed payment confirmation","prompt":"My agent just submitted a Base tx with hash 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca but I'm not sure it went through — can you check the status, number of confirmations, and whether any USDC was actually transferred?"}],"resultDescription":"Returns a JSON object with: transaction hash, block number, chain, decoded method name (e.g. 'aggregate3 (Multicall3)'), status (success/fail), gas used, fee in ETH, timestamp, all token transfers (from/to/token/amount/symbol), ETH value, confirmation count, a usdc_received map keyed by recipient address, payment_verified boolean, and is_x402_settlement boolean flag.","failureModes":["Invalid or malformed hash (not matching ^0x[0-9a-fA-F]{64}$) returns 400 error","Transaction not found on Base returns 404 or empty result","expect_to or expect_usdc mismatch causes payment_verified to return false","Network timeout or RPC issues may cause delayed or failed responses","Non-Base chain transaction hashes will not resolve correctly"],"whenToPreferThis":"Use this endpoint when you need to verify or audit a specific Base chain transaction — especially to confirm x402 USDC micropayment settlement before granting access to a resource. Prefer this over generic block explorers when you need structured, machine-readable output with explicit payment_verified and is_x402_settlement flags that an AI agent can act on directly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:16.598Z","isFirstParty":false,"canonicalSlug":"base-transaction-explainer-x402-payment-verifier-837e724e"}