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Chess Position Analysis & Move Generation (x402.forgemesh.io)
x402
Chess Position Analysis & Move Generation (x402.forgemesh.io) is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Analyzes a chess position from a FEN string, returning all legal moves in SAN and UCI notation, game state flags (check, checkmate, stalemate, draw, etc.), and optionally validates/applies a move to produce the resulting FEN.
Price / call$0.002
Success—
StatusUnknown
How this service works
Chess position analysis from a FEN string: every legal move in SAN and UCI notation, whose turn it is, and full game-state flags — check, checkmate, stalemate, draw, insufficient material, threefold repetition. Optionally validate and apply one move to get the resulting FEN. Deterministic rules logic, not engine evaluation.
Output
Returns a list of all legal moves in both SAN (e.g. Nf3) and UCI (e.g. g1f3) notation, indicates whose turn it is, and provides boolean game-state flags for check, checkmate, stalemate, draw, insufficient material, and threefold repetition. If a move was provided, also returns the resulting FEN after that move is applied.
Example use cases
Example prompt
“What are all the legal moves from this chess position — rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1 — and is the position in check? Also apply the move e7e5 and give me the resulting FEN.”
Technical details
Endpoint
POSThttps://x402.forgemesh.io/chess-movesWhen to prefer
Choose this endpoint when you need deterministic rules-based chess move generation or position validation — not engine evaluation or best-move suggestions. Ideal for chess apps, puzzle validators, game state machines, or any workflow that needs to enumerate legal moves or detect terminal game states from a FEN string without calling a full chess engine.
Side effects
- Invalid FEN string returns an error indicating unparseable position
- Illegal or malformed move string returns a validation error
- Move provided is not legal in the given position — returns error indicating illegal move
- Missing 'fen' field returns a 400-level bad request
- Ambiguous SAN move without sufficient context may fail to parse
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fen | string | FEN position string, or 'start' for the initial position |
| move | string | Optional move to validate/apply, SAN (Nf3) or UCI (g1f3) |
Output
Schema · Response
{
"type": "json",
"example": {
"turn": "white",
"state": {
"in_check": false,
"game_over": false
},
"valid_fen": true,
"legal_moves": [
"a3",
"a4",
"Nf3"
],
"move_applied": {
"san": "e4",
"legal": true,
"fen_after": "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1"
}
}
}Tags
x402
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