{"uid":"cap_d-agOIy-we6l8d0_wP9Ru","slug":"agent-arcade-chess-daily-tactics-puzzle-86345936","name":"Agent Arcade: Chess Daily Tactics Puzzle","description":"Chess Daily tactics puzzle — solve a deterministic UTC daily position from a pinned CC0 Lichess subset using legal UCI moves.","url":"https://agent-arcade.use.x402atlas.com/chess/daily","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"date":"2026-07-01","game":"chess","rules":{"notation":"uci","maximum_moves":16,"complete_principal_line_required":true},"prompt":{"fen":"r4rk1/5ppp/1np2q2/p1b5/2p1B3/P7/1P3PPP/R1BQ1RK1 w - - 2 18","rating":1825,"themes":["advantage","middlegame","short"],"puzzle_id":"00143","side_to_move":"white","answer_format":"uci_move_array"},"difficulty":"normal","attribution":{"source":"Lichess puzzle database","license":"CC0-1.0","snapshot_date":"2026-07-29","dataset_sha256":"f4b9105b75d4a99557625016c69f5bcc2b60ce3664f0c74071b426e62f5f3294","dataset_version":"lichess-puzzles-v1"},"challenge_id":"sha256:50697ebea7b2cc5947da85e12fe2069f49983c4ba3d206b09540d80733c0153a","generation_version":"v1"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_IxC2ztuuY0RQhzDcoL7pb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns today's deterministic UTC chess tactics puzzle (FEN, side to move, themes, rating) from a pinned CC0 Lichess subset, expecting a solution as an array of legal UCI moves.","exampleAgentPrompt":"Fetch today's UTC chess daily tactics puzzle from Agent Arcade so I can work out the correct sequence of UCI moves to solve it.","exampleUseCases":[{"title":"Daily chess puzzle training bot","prompt":"Pull today's chess daily tactics puzzle from Agent Arcade and walk me through the FEN position, which side is to move, and the themes involved so I can practice."},{"title":"AI agent chess reasoning benchmark","prompt":"Grab today's Agent Arcade chess puzzle — give me the FEN and the rules, and I'll submit the principal line of UCI moves as the solution."},{"title":"Chess puzzle difficulty tracker","prompt":"Fetch today's Agent Arcade chess daily puzzle and tell me its difficulty rating and tactical themes so I can log whether it's harder or easier than yesterday's."}],"resultDescription":"Returns a JSON object containing: challenge_id, game ('chess'), generation_version, date (UTC), difficulty, a prompt object with puzzle_id, FEN string, side_to_move (white/black), integer rating, and array of tactical themes, plus rules (UCI notation required, complete principal line required, maximum 16 moves) and attribution metadata.","failureModes":["Payment not provided or invalid x402 payment header — endpoint returns 402 Payment Required","Network error or service downtime — endpoint unreachable","Puzzle not yet generated for the current UTC day — may return 404 or empty response","Malformed request (unexpected query parameters) — returns 400 Bad Request due to additionalProperties:false constraint"],"whenToPreferThis":"Choose this endpoint when you need a deterministic, reproducible daily chess tactics puzzle anchored to UTC date — ideal for benchmarking AI reasoning, running daily puzzle bots, or tracking performance over time. Prefer it over generic Lichess API calls when you need a stable, versioned, CC0-licensed puzzle with structured UCI-format answer expectations and x402 micropayment access.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:32:22.482Z","isFirstParty":false}