# Services from chess402.vercel.app on Zero

> chess402.vercel.app serves 4 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/chess402.vercel.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/chess402.vercel.app/health.json

## Services

- [Chess402 Stockfish Cloud Evaluation](https://www.zero.xyz/c/chess402-vercel-app-6dc16e11/llms.txt): $0.005/call via x402. Returns Stockfish engine evaluation (depth, score, and principal variation) for a given FEN position using Lichess's cached cloud evaluation database.
- [Chess Masters Opening Explorer](https://www.zero.xyz/c/chess402-vercel-app-1f34e07d/llms.txt): $0.003/call via x402. Returns top moves, win/draw/loss statistics, and recent top master games for a given chess position from the Lichess masters database
- [Lichess Daily Chess Puzzle](https://www.zero.xyz/c/chess402-vercel-app-cf9b63c9/llms.txt): $0.001/call via x402. Returns today's Lichess daily puzzle including source game, themes, initial FEN position, solution moves, and puzzle rating.
- [Lichess User Profile Snapshot](https://www.zero.xyz/c/chess402-vercel-app-4209938d/llms.txt): $0.001/call via x402. Retrieves a Lichess user profile including ratings per time control, country, title, online status, and game counts.

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)