{"uid":"cap_-gpXvAff3TLNL7ffGlgh3","slug":"quartermaster-surewhynot-app-transaction-decoder-ae08200d","name":"quartermaster.surewhynot.app Transaction Decoder","description":"Decode a Base transaction's calldata into a human-readable function call and arguments — ERC-20 transfer/approve and the EIP-3009 transferWithAuthorization used by x402 settlements. Recognizes x402 settlement transactions.","url":"https://quartermaster.surewhynot.app/v1/tx-decode","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["hash"],"properties":{"hash":{"type":"string","pattern":"^0x[0-9a-fA-F]{64}$","description":"Base transaction hash to decode"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_lgz0RcFNbdi-lCR0Y-_7x","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Decodes a Base blockchain transaction's calldata into a human-readable function name and arguments, recognizing ERC-20 transfer/approve and EIP-3009 transferWithAuthorization used in x402 settlements.","exampleAgentPrompt":"Can you decode this Base transaction for me and tell me what function was called and with what arguments? The hash is 0x3a1b2c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b.","exampleUseCases":null,"resultDescription":"A structured breakdown of the transaction's calldata including the decoded function name (e.g. transfer, approve, transferWithAuthorization), all arguments with their names and values, and a flag indicating whether this is recognized as an x402 settlement transaction.","failureModes":["Transaction hash not found on Base — hash may be for a different chain or not yet confirmed","Invalid hash format — must be 0x-prefixed 66-character hex string","Transaction has no calldata (plain ETH transfer) — no function to decode","Unrecognized function selector — returns raw selector without human-readable decoding","Network timeout when fetching transaction from Base RPC"],"whenToPreferThis":"Use this endpoint when you need to understand what a specific Base transaction actually did at the calldata level — especially for ERC-20 transfers, approvals, or x402 settlement transactions using EIP-3009 transferWithAuthorization. Prefer this over generic block explorers when you need structured, machine-readable output for programmatic use or when working within an x402 payment workflow.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:48:20.523Z","isFirstParty":false}