# Services from chess-eval.x402supply.com on Zero

> chess-eval.x402supply.com serves 2 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/chess-eval.x402supply.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/chess-eval.x402supply.com/health.json

## Services

- [Chess Eval – Best Line (Principal Variation Playthrough)](https://www.zero.xyz/c/chess-eval-best-line-principal-variation-playthrough-804fe58e/llms.txt): $0.01/call via x402. Plays out Stockfish's predicted principal variation move-by-move, returning each ply as a SAN move with its per-ply centipawn evaluation and depth reached.
- [Chess Position Evaluator (Stockfish via x402)](https://www.zero.xyz/c/chess-position-evaluator-stockfish-via-x402-51c4601d/llms.txt): $0.01/call via x402. Evaluates a chess position using real Stockfish 10 (asm.js), returning the best move, centipawn/mate score, and principal variation for a given FEN string.

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)