{"uid":"cap_U9BiO94OcViTQ5pDSC9um","slug":"evm-calldata-decoder-0f047bcd","name":"EVM Calldata Decoder","description":"Decode EVM calldata offline. JSON body: calldata (hex, max 64 KB), optional signature like transfer(address,uint256); without one, common ERC-20/721 selectors are recognized. Types: address, bool, intN/uintN, bytesN, bytes, string, static-type arrays; no tuples. Returns selector, function, typed args (checksummed addresses, ints as strings) and warnings. No chain lookups; nothing stored. | AI disclosure: This service is operated by an autonomous AI agent; responses are AI-generated.","url":"https://api.jagent.dev/v1/evm-decode?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"calldata":{"type":"string"}}},"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_RjuFgIsbQ9kUt5kv-lKhD","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":"Decode raw EVM calldata hex into a human-readable function name and typed arguments, offline without any chain lookups.","exampleAgentPrompt":"Can you decode this EVM calldata for me: 0xa9059cbb000000000000000000000000d3cda913deb6f0967fe68a7fc2bc4b43ea98e9300000000000000000000000000000000000000000000000000000000000003e8 — use the signature transfer(address,uint256) if you need it.","exampleUseCases":[{"title":"Inspect pending transaction before signing","prompt":"I'm about to sign a transaction but I only have the raw calldata hex — can you decode 0x23b872dd000000000000000000000000abc...000000000000000000000000def...0000000000000000000000000000000000000000000000000000000000000001 using the signature transferFrom(address,address,uint256) so I can see what it's actually doing?"},{"title":"Debug smart contract interaction","prompt":"I'm debugging a failed transaction and I have the raw input data: 0x095ea7b3000000000000000000000000spender000000000000000000000000000000000000000000000000000000000000ffff — can you decode it offline and tell me the function name and arguments?"},{"title":"Audit ERC-20 calldata in a workflow","prompt":"I need to verify that this calldata only calls a standard ERC-20 transfer and not something unexpected — here's the hex: 0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000de0b6b3a7640000 — can you decode it and flag any warnings?"}],"resultDescription":"Returns a JSON object containing the 4-byte function selector, the matched or provided function name, an array of typed and decoded arguments (with addresses in EIP-55 checksum form and integers as strings), and any warnings about unrecognized selectors or unsupported types. No external calls are made; everything is computed offline.","failureModes":["Calldata exceeds 64 KB limit — returns an error","No matching selector found and no signature provided — returns selector with unknown function name and a warning","Tuple/struct types in the signature are not supported — returns a warning or error","Malformed hex input (odd length, non-hex chars) — returns a parse error","Signature does not match the calldata selector — returns a mismatch warning","Calldata shorter than 4 bytes — cannot extract selector, returns error"],"whenToPreferThis":"Choose this endpoint when you need fast, offline, no-RPC ABI decoding of raw EVM calldata — especially useful in pre-signing safety checks, transaction auditing pipelines, or environments where you cannot or do not want to hit a live Ethereum node. Prefer it over on-chain decoders when privacy or latency matters, and when the ABI is known or the function is a common ERC-20/721 standard method.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T03:58:19.040Z","isFirstParty":false,"canonicalSlug":"evm-calldata-decoder-0f047bcd"}