Polymarket Prediction Market Data

Live and historical forecast probabilities from Polymarket, the largest prediction market. Each market asks a question about a future event (an election, a Fed decision, a sports result, a product launch, a crypto price) and its price is the crowd's probability that the outcome happens. The API covers every active and resolved market: questions and outcomes, current probabilities, trading volume, liquidity, open interest, end dates and resolutions, plus full price history that goes back to a market's launch. Use it to track how expectations moved around news, compare forecasts across events, or chart the odds of anything the market covers. No API key required.

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Polymarket Prediction Market Data

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What you can query

market and event search, current outcome probabilities, 24h/1w/1mo/1y volume, liquidity, open interest, end dates and resolutions, full price history (daily back to launch, hourly and finer for recent periods), recent trades, top holders, tags/categories

What you can do

  • Chart how the probability of an event changed over time
  • Track forecasts for elections, Fed decisions, and economic releases
  • Find the most traded or fastest-moving prediction markets right now
  • Compare the market's forecast with an outcome or another data source
  • Build a dashboard of the forecasts that matter to your business

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