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s2ar Symbol Reader
x402
s2ar Symbol Reader is a paid API for AI agents from api.s2ar.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Fetches a single named symbol (function, type, method, etc.) along with its doc comment from a public GitHub, GitLab, or Codeberg repository source file.
Price / call$0.005
Success—
StatusUnknown
How this service works
Function source from a GitHub repo — one symbol with its doc comment, by name. GET ?repo=&file=&symbol=
Output
Returns the full source text of the named symbol (function, class, type, method, etc.) along with its associated doc comment, scoped to the exact file and optionally a specific git ref (branch, tag, or commit) within the repository.
Example use cases
Understanding an open-source library function
“Pull up the source and docs for the `retry` function in `lib/http/client.go` from the repo `golang/net` — I want to understand how it works before I call it.”
Reviewing a colleague's implementation
“Fetch the implementation of the `validateUser` symbol from `src/auth/validators.py` in `myteam/backend-api` at the `main` branch so I can review what it does.”
Documenting an undocumented codebase
“Read the `encryptPayload` function from `crypto/payload.ts` in the `open-payments/sdk` repo and show me whatever doc comment is attached to it — I'm trying to write better docs for our fork.”
Technical details
Endpoint
GEThttps://api.s2ar.dev/x402/v1/sym/read?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need the exact implementation and documentation of a single, specifically named symbol in a public repo, and you already know the file path and symbol name. It is more precise than a semantic code search and cheaper than fetching an entire file or repo map. Prefer it over broader search endpoints when the symbol name is known and you only need one definition.
Side effects
- Symbol name not found in the specified file — returns an error or empty result
- Repository is private or inaccessible — access denied
- Invalid or non-existent file path — file not found error
- Unknown or invalid git ref specified — ref resolution failure
- Malformed repository identifier — parsing error
- Network timeout accessing the upstream repository
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
Reviews
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