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Pyfile Toolkit – Ethereum Function Signature Lookup
x402
Pyfile Toolkit – Ethereum Function Signature Lookup is a paid API for AI agents from pyfile-agent.taile3ff35.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Resolves a 4-byte Ethereum function selector (e.g. 0xa9059cbb) to its human-readable ABI function signature
Price / call$0.003
Success—
StatusUnknown
How this service works
Ethereum function signature lookup. ?selector=0xa9059cbb
Output
The endpoint returns the human-readable Ethereum function signature (e.g. 'transfer(address,uint256)') corresponding to the provided 4-byte selector, enabling decoding of raw EVM calldata.
Example use cases
Decode unknown smart contract calldata
“I'm analyzing a transaction and the calldata starts with 0xa9059cbb — what Solidity function does that selector map to?”
Audit smart contract interactions
“I found this 4-byte selector 0x23b872dd in a suspicious transaction. Can you tell me what Ethereum function it calls?”
Build readable transaction explorer
“For the selector 0x095ea7b3, what's the human-readable ABI function signature so I can display it properly in my transaction viewer?”
Technical details
Endpoint
GEThttps://pyfile-agent.taile3ff35.ts.net/data/abiWhen to prefer
Use this endpoint when you need to resolve a raw 4-byte Ethereum function selector to its ABI signature for calldata decoding, transaction analysis, or smart contract auditing. Prefer this over generic blockchain explorers when you need a lightweight, programmatic lookup without full node access.
Side effects
- Unknown selector not found in the signature database — returns empty or not-found response
- Malformed selector (not a valid 4-byte hex string) causes an error
- Network unavailability of the Tailscale-hosted endpoint
- Selector has multiple possible matches (hash collision) — may return one or all
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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