{"uid":"cap_HTSoIlLPLHkwbOD97UXCU","slug":"polymarket-price-history-17f0c4ad","name":"Polymarket Price History","description":"Historical odds (implied probabilities) for a Polymarket outcome token. Returns timestamped price samples with first/last/min/max summary. Useful for: tracking probability shifts around events, computing realized volatility, backtesting prediction strategies.","url":"https://agent402.tools/api/polymarket-price-history","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"tokenId":{"type":"string","description":"CLOB token id (decimal string) from market.clobTokenIds."},"fidelity":{"type":"number","description":"Sample granularity in minutes (1-720, default 60)."},"interval":{"type":"string","description":"Lookback window: 1h, 6h, 1d, 1w, 1m, max (default 1d)."}}},"responseSchema":{"type":"json","example":{"max":0.67,"min":0.55,"last":0.62,"count":24,"first":0.58,"points":[{"price":0.58,"timestamp":1751200000},{"price":0.59,"timestamp":1751203600}],"source":"polymarket-clob","tokenId":"72909...","interval":"1d","fidelityMinutes":60}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_x49dFtrpTLrZnYAWso4T9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns historical implied probability samples for a Polymarket outcome token, including timestamped price series and first/last/min/max summary statistics.","exampleAgentPrompt":"Show me the hourly probability history for Polymarket token 12345678 over the past week — I want to see the first, last, min, and max prices and all the timestamped samples.","exampleUseCases":null,"resultDescription":"A list of timestamped price samples (implied probabilities between 0 and 1) for the specified Polymarket outcome token, plus a summary with first, last, minimum, and maximum values across the requested lookback window.","failureModes":["Invalid or unknown tokenId returns an error or empty result","fidelity value outside 1-720 range rejected","Unrecognized interval string returns an error","Polymarket CLOB data unavailable for the requested window","Network timeout or upstream API failure"],"whenToPreferThis":"Use this endpoint when you need historical probability timeseries data for a specific Polymarket outcome token — particularly for analyzing how market sentiment shifted around events, computing volatility, or backtesting prediction strategies. Prefer this over the live orderbook endpoint when historical context matters rather than current bids/asks.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:55:10.081Z","isFirstParty":false}