# Services from api.s2ar.dev on Zero

> api.s2ar.dev serves 9 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.s2ar.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.s2ar.dev/health.json

## Services

- [s2ar Symbol Finder — Code Search by Name in GitHub Repo](https://www.zero.xyz/c/s2ar-symbol-finder-code-search-by-name-in-github-repo-76b6a785/llms.txt): $0.005/call via x402. Searches a public GitHub, GitLab, or Codeberg repository for every definition of a named symbol, returning file paths and line ranges for all matches.
- [s2ar Poetry Form Scorer](https://www.zero.xyz/c/s2ar-poetry-form-scorer-dc478eb6/llms.txt): $0.005/call via x402. Grades a text passage against a named poetic form, returning deterministic meter, rhyme, and line diagnostics
- [s2ar x402 Endpoint Inspector](https://www.zero.xyz/c/s2ar-x402-endpoint-inspector-a67953c7/llms.txt): $0.005/call via x402. Probes a given HTTPS endpoint for its x402 payment-wall properties — 402 status, accepted payment methods, price, Bazaar extension, and CDP verdict — returning a signed, verifiable record.
- [s2ar Semantic Code Search](https://www.zero.xyz/c/s2ar-semantic-code-search-36dd249b/llms.txt): $0.01/call via x402. Searches a GitHub/GitLab/Codeberg repository by meaning/natural language query and returns matching symbol definitions with file paths and line numbers
- [s2ar Repo Symbol Map](https://www.zero.xyz/c/s2ar-repo-symbol-map-dfa53753/llms.txt): $0.01/call via x402. Returns files in a GitHub/GitLab/Codeberg repo ranked by imports, with their definitions, fitted to a token budget.
- [s2ar Symbol Listing (File Skeleton)](https://www.zero.xyz/c/s2ar-symbol-listing-file-skeleton-916e24bb/llms.txt): $0.005/call via x402. Returns a structural skeleton of a source file from a GitHub/GitLab/Codeberg repo — every function, type, and method with their line ranges but without body code.
- [s2ar Symbol Reader](https://www.zero.xyz/c/s2ar-symbol-reader-d75cc6fc/llms.txt): $0.005/call via x402. Fetches a single named symbol (function, type, method, etc.) along with its doc comment from a public GitHub, GitLab, or Codeberg repository source file.
- [s2ar Image Certify](https://www.zero.xyz/c/s2ar-image-certify-1583c15d/llms.txt): $0.01/call via x402. Compress an image and verify that a vision model can still read it, returning a signed, publicly verifiable certificate
- [s2ar Assert](https://www.zero.xyz/c/s2ar-assert-6f5dc020/llms.txt): $0.005/call via x402. Validates agent output against JSON schema, term lists, length constraints, citation rules, and source quotes, returning a signed verification record.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)