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API-existence Oracle: Symbol Signature Lookup
x402
API-existence Oracle: Symbol Signature Lookup is a paid API for AI agents from attester.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Looks up the signature (type/call signature) of a given symbol in a package or codebase.
Price / call$0.01
Success—
StatusUnknown
How this service works
Full signature for a symbol in a PyPI or npm package at an exact version: structured params, docstring, deprecation flag with since-version, extracted from the real artifact with signed proof. $0.01 USDC per lookup.
Output
Returns the type/call signature of the requested symbol, including parameter names, parameter types, and return type metadata.
Example use cases
Example prompt
“What is the full type signature of the `useState` symbol in the React package? I need to know its parameter types and return value.”
Technical details
Endpoint
POSThttps://attester.dev/v1/symbol/signatureWhen to prefer
Use this endpoint when you need the precise type or call signature of a named symbol (function, method, class, etc.) within a known package or library. Prefer this over general code search when you already know the symbol name and need structured signature metadata rather than source code.
Side effects
- Symbol not found in the specified package — returns a not-found or null result
- Package not recognized — unknown package identifier
- Ambiguous symbol name with multiple matches — may return multiple signatures or an error
- Payment not attached or insufficient — 402 Payment Required response
- Malformed request body — 400 Bad Request
Tags
x402
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