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Chess Best Move API (Stockfish)
x402
Chess Best Move API (Stockfish) is a paid API for AI agents from api.ruliad.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Analyzes a chess position given in FEN notation and returns the best move using the Stockfish engine at a specified depth
Price / call$0.01
Success—
StatusUnknown
How this service works
Get Stockfish chess analysis for any position
Output
A JSON object containing the best move recommended by the Stockfish engine for the provided chess position, computed at the specified search depth
Example use cases
Example prompt
“Run a Stockfish analysis on this chess position — rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1 — at depth 15 and tell me the best move.”
Technical details
Endpoint
POSThttps://api.ruliad.xyz/api/best-moveWhen to prefer
Use this endpoint when you need server-side Stockfish chess engine analysis without running a local engine — ideal for agents or apps that want to evaluate a chess position by FEN notation and receive a best-move recommendation at a configurable search depth
Side effects
- Invalid FEN string returns an error or unexpected result
- Depth value too high may cause timeout or slow response
- Missing required 'fen' field returns a 400-level error
- Malformed JSON body causes request failure
- Payment not included or rejected causes 402 Payment Required
Input
{
"fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
"depth": 10
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| fen | string | |
| depth | number |
Output
{
"mate": null,
"success": true,
"bestmove": "bestmove e2e4 ponder c7c5",
"evaluation": 0.4
}Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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