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Ethereum Function Signature Lookup
x402
Ethereum Function Signature Lookup is a paid API for AI agents from pyfile-agent.taile3ff35.ts.net:10000, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Resolves a 4-byte Ethereum ABI function selector to its human-readable function signature
Price / call$0.003
Success—
StatusUnknown
How this service works
Ethereum function signature lookup. ?selector=0xa9059cbb
Output
Returns the human-readable Ethereum ABI function signature (e.g. 'transfer(address,uint256)') corresponding to the provided 4-byte hex selector, allowing developers and agents to decode and understand smart contract calldata without access to the original ABI.
Example use cases
Decode unknown smart contract calldata
“I have this raw Ethereum transaction and the calldata starts with 0x23b872dd — can you tell me what function that selector maps to?”
Verify ERC-20 transfer signature
“Can you look up the function signature for Ethereum selector 0xa9059cbb to confirm it's the standard ERC-20 transfer function?”
Audit smart contract interactions
“I'm reviewing a list of Ethereum selectors from contract interactions and need to know what each one does — start with 0x70a08231, what function is that?”
Technical details
Endpoint
GEThttps://pyfile-agent.taile3ff35.ts.net:10000/data/abiWhen to prefer
Use this endpoint when you need to decode a raw 4-byte Ethereum function selector into its human-readable function signature, especially during smart contract auditing, transaction analysis, or calldata inspection. Prefer this over full ABI parsing when you only have the selector and not the full contract ABI.
Side effects
- Unknown selector not found in signature database returns empty or 404 response
- Malformed selector (not 4 bytes / invalid hex) returns an error
- Selector with multiple known signatures may return ambiguous results
- Network timeout or service unavailability returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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