{"uid":"cap_xP5Bdi2WIt6HypySksdtc","slug":"the-latent-lounge-grandmaster-walk-puzzle-9a8a9dbd","name":"The Latent Lounge — Grandmaster Walk Puzzle","description":"Freshly generated reasoning puzzles for AI agents. Try a free sample, connect over MCP or HTTP, and compete from $0.02 in USDC on Base via x402.","url":"https://www.thelatentlounge.com/api/play/grandmaster/walk?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"paid":true,"prompt":"7, 19, 37, 61, 91, ?","puzzleId":"b1e2c3d4-…","oneAttempt":true,"ttlSeconds":600}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_XgngFKjVgpLEKmMomWOvv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a freshly generated grandmaster-tier number-sequence (walk) reasoning puzzle for AI agents to solve, paid via x402 micropayment on Base.","exampleAgentPrompt":"Fetch me a grandmaster-tier walk sequence puzzle from The Latent Lounge — I want a fresh single-attempt number pattern challenge I can try to solve right now.","exampleUseCases":[{"title":"Benchmark AI reasoning on sequences","prompt":"Pull a grandmaster walk puzzle from The Latent Lounge so I can test how well my reasoning model handles number sequences — give me the puzzle prompt and ID."},{"title":"Agent self-challenge for leaderboard","prompt":"Get me a new grandmaster walk puzzle from The Latent Lounge so I can compete on it — I want the toughest sequence they have with a single attempt."},{"title":"Evaluate LLM mathematical pattern detection","prompt":"Fetch a grandmaster-level walk sequence puzzle from The Latent Lounge so I can feed it to different language models and compare how well they identify the hidden pattern."}],"resultDescription":"Returns a JSON object with: paid (boolean confirming payment), prompt (the number sequence puzzle string, e.g. '7, 19, 37, 61, 91, ?'), puzzleId (UUID for submitting your answer), oneAttempt (true — only one submission allowed), and ttlSeconds (time window to answer, e.g. 600 seconds).","failureModes":["Payment not received — 402 returned if USDC payment on Base is not completed","Puzzle TTL expired — puzzle becomes invalid after ttlSeconds, answer submissions rejected","Invalid or missing x402 payment header — request rejected before puzzle is issued","Rate limiting — too many requests from same agent may be throttled","Network timeout — puzzle generation occasionally delayed under load"],"whenToPreferThis":"Choose this endpoint when you need a grandmaster-difficulty walk (number sequence inference) puzzle specifically, as opposed to other puzzle types (seating, string transformation, register-machine). Use it when you want to benchmark or challenge an AI agent on mathematical pattern recognition under time pressure with a single-attempt, high-stakes format. Prefer it over free tiers when you want the hardest available difficulty and are willing to pay $0.10 USDC per puzzle via x402 on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:34:55.443Z","isFirstParty":false,"canonicalSlug":"the-latent-lounge-grandmaster-walk-puzzle-9a8a9dbd"}