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Chess Notation Tools – Material Balance from FEN
x402
Chess Notation Tools – Material Balance from FEN is a paid API for AI agents from chess-notation.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Computes material balance from a FEN string using standard piece values (1-3-3-5-9), returning point totals for each side, their difference, and per-piece counts.
Price / call$0.02
Success—
StatusUnknown
How this service works
Material balance from a FEN: standard 1-3-3-5-9 point totals per side, difference and piece lists.
Output
Returns per-side piece counts (pawns, knights, bishops, rooks, queens), total points for white and black using standard values (P=1, N=3, B=3, R=5, Q=9), the numeric material difference (positive = white ahead), bishop pair flags for each side, a summary verdict, and optional metadata fields like source, degraded status, and disclaimer.
Example use cases
Evaluating middlegame material advantage
“I have this FEN from a game I'm analyzing: 'r4rk1/pp3ppp/2n1bn2/3p4/3P4/2N1BN2/PP3PPP/R4RK1 w - - 0 12' — can you tell me the material count for white and black and who has more points?”
Detecting one-sided endgame material
“Here's the endgame position FEN: '8/5pk1/6p1/8/8/6P1/5PK1/3Q4 w - - 0 40' — can you show me the piece counts and total point values for each side so I know how lopsided the material is?”
Checking if bishop pair bonus applies
“Does either side have the bishop pair in the position 'rn1qkb1r/ppp2ppp/4pn2/3p4/2PP4/2N2N2/PP2PPPP/R1BQKB1R w KQkq - 0 5'? Also give me the full material tally.”
Technical details
Endpoint
GEThttps://chess-notation.x402tookit.com/material-count?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, structured material count from a FEN string using the standard chess point system. It is ideal for game analysis pipelines, chess tutoring bots, or position evaluation steps where you need numeric material totals and per-piece breakdowns without running a full engine evaluation. Prefer it over a full engine call when material balance alone is sufficient.
Side effects
- Missing or malformed FEN query parameter returns an error
- FEN with invalid placement field (wrong number of ranks/files) may cause parsing failure
- Non-FEN strings passed as the fen parameter return validation errors
- Kings are not counted in point totals (by design), which may surprise callers expecting full piece lists
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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