{"uid":"cap_Q6CqjdsgPVkIogQUxWJBI","slug":"chess-notation-tools-fen-to-ascii-board-a35c6a33","name":"Chess Notation Tools – FEN to ASCII Board","description":"Render a FEN position as an 8x8 ASCII board (White at the bottom) plus a piece-by-square list.","url":"https://chess-notation.x402tookit.com/fen-board?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["fen"],"properties":{"fen":{"type":"string","description":"A FEN string; only the first field (piece placement) is required"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"rows":{"type":["array","null"],"items":{"type":"string"}},"ascii":{"type":["null","string"]},"pieces":{"type":["array","null"],"items":{"type":"object","properties":{"color":{"type":["null","string"]},"piece":{"type":["null","string"]},"square":{"type":["null","string"]}}}},"source":{"type":["null","string"]},"reasons":{"type":["array","null"]},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"pieceCount":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_zFLOpoQUZYlUmhwQlqzft","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Renders a FEN position string as an 8x8 ASCII chess board (White at bottom) plus a piece-by-square inventory list.","exampleAgentPrompt":"Can you render the FEN 'rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1' as an ASCII chessboard with a list of all pieces and their squares?","exampleUseCases":[{"title":"Visualize opening position after e4","prompt":"Show me an ASCII chessboard for the FEN 'rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1' and tell me which pieces are on which squares."},{"title":"Debug a puzzle starting position","prompt":"I have this puzzle FEN: 'r1bqk2r/pppp1ppp/2n2n2/2b1p3/2B1P3/2N2N2/PPPP1PPP/R1BQK2R w KQkq - 4 4' — can you render it as an ASCII board so I can see the piece placement?"},{"title":"Review endgame piece inventory","prompt":"Can you convert this endgame FEN '8/5k2/8/3KP3/8/8/8/8 w - - 0 1' into an ASCII board and list every piece still on the board with its square?"}],"resultDescription":"Returns an ASCII 8x8 board string with White at the bottom, an array of row strings, a list of pieces each with color, piece type, and square identifier, and a piece count. Also includes metadata fields like source and timestamp.","failureModes":["Missing or malformed FEN query parameter returns an error","Invalid FEN piece placement characters cause a parse failure","Completely empty FEN string is rejected","Payment not included or insufficient USDC results in 402 response"],"whenToPreferThis":"Choose this endpoint when you need a human-readable or agent-readable visual representation of a chess position from a FEN string, especially for display, debugging, or explaining board state. It is the right choice when you want both an ASCII diagram and a structured piece-by-square list in one call, rather than writing your own FEN parser.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:30:49.347Z","isFirstParty":false,"canonicalSlug":"chess-notation-tools-fen-to-ascii-board-a35c6a33"}