{"uid":"cap_Gv4za065pqkblqFyq700q","slug":"vextorium-polymarket-history-4c5d825f","name":"Vextorium Polymarket History","description":"558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.","url":"https://api.vextorium.com/v1/polymarket-history?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"slug":{"type":"string"},"result":{"type":"integer","description":"Outcome index (0 = first)"},"interval":{"enum":["1h","6h","1d","1w","1m","max"],"type":"string"}}},"responseSchema":{"type":"json","example":{"result":"Yes","series":[{"date":"2026-10-01T20:30+00:00","probability_pct":0.05},{"date":"2026-10-01T21:00+00:00","probability_pct":0.05}],"max_pct":0.05,"min_pct":0.05,"interval":"1d","question":"Will Oprah Winfrey win the 2028 Democratic presidential nomination?","change_pp":0,"current_probability_pct":0.05}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Z9zwD57N57i6wkDCeu37_","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches historical probability time-series data for a Polymarket prediction market by slug, including current probability, min/max, and change over a chosen interval.","exampleAgentPrompt":"Pull the daily probability history for the Polymarket market 'will-oprah-winfrey-win-the-2028-democratic-presidential-nomination', outcome index 0, using the 1d interval — show me the current probability, the min/max, and how much it's changed.","exampleUseCases":[{"title":"Tracking election odds over time","prompt":"Get me the weekly probability history for the Polymarket market slug 'will-donald-trump-win-the-2024-us-presidential-election', outcome 0, so I can see how the odds have moved over time."},{"title":"Monitoring a crypto event prediction","prompt":"Fetch the hourly Polymarket probability data for 'will-bitcoin-reach-100k-by-end-of-2025', outcome index 0, using the 1h interval — I want to see the current probability and how much it's shifted recently."},{"title":"Comparing current vs historical market probabilities","prompt":"Check the max interval history for Polymarket slug 'will-the-fed-cut-rates-in-march-2025', outcome 0 — give me the all-time high and low probabilities and the current reading."}],"resultDescription":"Returns a JSON object with the market question text, the outcome label (e.g. 'Yes'), a time-series array of {date, probability_pct} objects, the current probability percentage, min/max probabilities over the period, the interval used, and the change in percentage points.","failureModes":["Invalid or non-existent slug returns an error or empty result","Outcome index out of range returns null or error","Unsupported interval value rejected at schema validation","Market with insufficient history may return a sparse or empty series","Network timeout or upstream Polymarket API unavailability"],"whenToPreferThis":"Use this endpoint when you need historical probability data for a specific Polymarket prediction market, particularly for time-series charting, trend analysis, or monitoring how crowd-sourced event probabilities have evolved. Prefer this over generic DeFi data endpoints when the user explicitly references Polymarket markets or prediction market odds.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T12:45:28.401Z","isFirstParty":false,"canonicalSlug":"vextorium-polymarket-history-4c5d825f"}