{"slug":"api-x402node-dev-chain-sig-decode-b025e7","title":"Decode a 4-byte function selector or calldata into human-readable Solidity funct","host":"api.x402node.dev","method":"GET","resource":"https://api.x402node.dev/chain/sig-decode","category":"market","description":"Decode a 4-byte function selector or calldata into human-readable Solidity function signatures via openchain - reverses on-chain selectors that LLMs cannot know. function selector, 4byte decode, sig decode, calldata decode, method id, selector lookup Accepts payment on Base or Solana — either networ","price_listed":0.004,"price_asked":0.004,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":484,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"data":"string","selector":"string","sig":"string"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"data":{"description":"Data (optional)","type":"string"},"selector":{"description":"4-byte selector or full calldata, e.g. 0xa9059cbb (required)","type":"string"},"sig":{"description":"Sig (optional)","type":"string"}},"required":["selector"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-18","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.004,"price_match":true,"latency_ms":484,"error":null}],"description_full":"Decode a 4-byte function selector or calldata into human-readable Solidity function signatures via openchain - reverses on-chain selectors that LLMs cannot know. function selector, 4byte decode, sig decode, calldata decode, method id, selector lookup Accepts payment on Base or Solana — either network works.","last_updated":"2026-10-16T07:47:29.419Z","schemes":["exact"]}