{"uid":"cap_kJBIxFNm-XTYh8BNPnF9J","slug":"evm-calldata-decoder-d447d36f","name":"EVM Calldata Decoder","description":"The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.","url":"https://2s.io/api/crypto/decode-calldata","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"data":{"type":"string","maxLength":60000}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0025","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":"$0.0025/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0025","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0025","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_8RKArbaf007oAwGE5bth1","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0025","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Decodes raw EVM transaction calldata into human-readable function names, parameters, and values","exampleAgentPrompt":"Can you decode this raw EVM calldata for me and tell me what function was called and with what parameters: 0xa9059cbb000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045000000000000000000000000000000000000000000000000002386f26fc10000","exampleUseCases":[{"title":"Inspect a suspicious transaction","prompt":"I found this transaction input data on Etherscan and I'm not sure what it's doing — can you decode this calldata for me: 0x23b872dd000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9b?"},{"title":"Verify a DeFi swap before signing","prompt":"Before I sign this transaction, can you decode this calldata and tell me exactly what function it's calling and what the parameters are: 0x7ff36ab5000000000000000000000000000000000000000000000000002386f26fc10000?"},{"title":"Debug a failed smart contract call","prompt":"My smart contract call failed and I need to understand what was actually sent — can you decode this calldata hex and show me the function name and all the arguments: 0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045?"}],"resultDescription":"Returns the decoded function name/signature, along with each parameter's name, type, and decoded value — transforming an opaque hex blob into a structured, human-readable breakdown of what smart contract function was called and with what arguments.","failureModes":["Calldata is malformed or not valid ABI-encoded hex — returns error","Unknown or unrecognized function selector not in signature database — partial decode or error","Empty or zero-length calldata (plain ETH transfer) — no function to decode","Calldata exceeds 60,000 character limit — rejected with validation error","Non-EVM calldata passed in — garbled or failed decode"],"whenToPreferThis":"Choose this endpoint when you have a raw hex calldata string from an EVM transaction and need to understand what function was called and with what parameters, without setting up a local ABI decoder or writing custom parsing code. Ideal for transaction inspection, security auditing, debugging smart contract interactions, or explaining DeFi operations to end users.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:57:54.581Z","isFirstParty":false}