# Services from chess-notation.x402tookit.com on Zero

> chess-notation.x402tookit.com serves 8 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-notation.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/chess-notation.x402tookit.com/health.json

## Services

- [Chess Notation Tools – Square Info](https://www.zero.xyz/c/chess-notation-tools-square-info-8e24ed9e/llms.txt): $0.02/call via x402. Returns file, rank, color, index, diagonals, mirror squares, and positional flags for a given chess square like e4.
- [Chess Notation Tools – FEN to ASCII Board](https://www.zero.xyz/c/chess-notation-tools-fen-to-ascii-board-a35c6a33/llms.txt): $0.02/call via x402. Renders a FEN position string as an 8x8 ASCII chess board (White at bottom) plus a piece-by-square inventory list.
- [Chess Notation Tools – Material Balance from FEN](https://www.zero.xyz/c/chess-notation-tools-material-balance-from-fen-c83237f9/llms.txt): $0.02/call via x402. 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.
- [Chess Notation Tools – PGN Header Parser & Validator](https://www.zero.xyz/c/chess-notation-tools-pgn-header-parser-validator-e86167db/llms.txt): $0.02/call via x402. Parses PGN tag pairs, validates the Seven Tag Roster, checks result token and date format, and counts moves in the movetext.
- [Chess Notation Tools – Piece Moves from Square](https://www.zero.xyz/c/chess-notation-tools-piece-moves-from-square-07429b7e/llms.txt): $0.02/call via x402. Returns all squares a given chess piece can reach from a specified starting square on an empty board, along with the count of reachable squares.
- [Chess Square Distance Calculator](https://www.zero.xyz/c/chess-square-distance-calculator-09408d80/llms.txt): $0.02/call via x402. Computes the minimum number of moves between two chess squares for king, rook, bishop, and knight pieces on an empty board.
- [Chess Time Control Classifier](https://www.zero.xyz/c/chess-time-control-classifier-bee03c8a/llms.txt): $0.02/call via x402. Classifies a chess time control (bullet, blitz, rapid, or classical) from base minutes and optional increment, and returns estimated game length.
- [Chess FEN Validator](https://www.zero.xyz/c/chess-fen-validator-ffc1cc22/llms.txt): $0.02/call via x402. Validates a chess FEN string by checking syntax of all six fields, king and pawn counts, castling rights, en passant consistency, and piece totals.

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)