{"uid":"cap_adoaN6MyQ08EqabO4mV2Y","slug":"hars-zero-signal-api-historical-screener-d36929ae","name":"HARS-Zero Signal API – Historical Screener","description":"Polymarket prediction-market intelligence for AI agents. Pay-per-call in USDC via x402 protocol. Multi-chain: Base + Solana.","url":"https://hars.cryptotavern.xyz/paid/historical-screener?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"object","example":{"count":0,"markets":[]}},"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":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_uloDROIg7iyFYh6P-ado7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Screens historical Polymarket prediction-market data to surface intelligence signals for AI agents, billed per call in USDC via x402.","exampleAgentPrompt":"Pull me historical Polymarket markets related to US elections from HARS-Zero — I want to see which markets closed and what the outcomes were.","exampleUseCases":[{"title":"Research resolved election prediction markets","prompt":"Screen Polymarket's historical data for any resolved markets about the 2024 US presidential election — I want to see how they were priced and what happened."},{"title":"Backtest crypto event market signals","prompt":"Pull all past Polymarket markets related to Bitcoin ETF approval from HARS-Zero so I can analyze how the crowd priced that event over time."},{"title":"Sports outcomes market analysis","prompt":"Use the HARS-Zero historical screener to find closed Polymarket markets about NFL Super Bowl outcomes — I need the list of markets and their final results."}],"resultDescription":"Returns a JSON object with a count of matched markets and an array of historical market records from Polymarket matching the supplied filter criteria. Markets array may be empty if no records match.","failureModes":["Empty markets array and count=0 when no markets match the filter criteria","402 Payment Required if USDC payment via x402 is not included or insufficient","Invalid or malformed properties filter may return an error or empty result","Rate limiting or service unavailability returning 5xx errors","Ambiguous filter properties leading to unexpectedly broad or narrow result sets"],"whenToPreferThis":"Choose this endpoint when you need to screen or filter historical Polymarket prediction-market data programmatically within an AI agent workflow, especially when paying per-call in USDC via x402 suits your architecture. Prefer it over direct Polymarket API access when you want pre-packaged intelligence signals rather than raw market data, or when operating on Base or Solana chains.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:45:59.205Z","isFirstParty":false,"canonicalSlug":"hars-zero-signal-api-historical-screener-d36929ae"}