Documentation

Start

• QuickstartFirst evaluation in two minutes
• Errors and next_actionEvery error tells you what to do
• Limits, units and budgetsHow cost works and how to cap it

Guides

• Stockfish from Pythonrequests, async, and python-chess
• Stockfish from JavaScript and TypeScriptfetch in Node, Deno, Bun and the browser
• Use Stockfish from Claude, Cursor and other MCP clientsthe MCP server and the Claude Code skill
• A Discord chess bot in 60 linesanswer /analyze with a board and the best line
• A lichess bot backed by the APIplay on lichess without hosting an engine
• Annotate PGNs in CIa GitHub Action that evaluates every game in a repo
• Give an OpenAI or Anthropic model a chess enginetool-calling definition and a budget guard

API reference

• POST /v1/eval
• POST /v1/bestmove
• GET /v1/engines
• GET /v1/price
• POST /v1/legal-moves
• POST /v1/validate
• POST /v1/signup
• GET /v1/me
• GET /v1/usage
• GET /v1/keys
• POST /v1/keys
• PATCH /v1/keys/{id}
• DELETE /v1/keys/{id}
• POST /v1/keys/{id}/rotate
• POST /v1/analyze
• POST /v1/batch
• GET /v1/jobs/{id}
• DELETE /v1/jobs/{id}
• GET /v1/jobs/{id}/result
• POST /v1/billing/checkout
• POST /v1/billing/portal