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Polymarket

The largest prediction market by volume. EventGraph ingests all the active events every 15 minutes.
  • Platform code: polymarket
  • Market type: Binary (Yes/No) and categorical
  • Price range: 0.01 – 0.99 (implied probability)
  • Volume currency: USDC
  • Event URL format: https://polymarket.com/event/{event_slug}/{market_slug}

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Kalshi

US-regulated prediction exchange. Ingested every 15 minutes.
  • Platform code: kalshi
  • Market type: Binary and multi-outcome (multiple sub-markets per event)
  • Price range: 0.01 – 0.99 (cents on the dollar)
  • Volume currency: USD
  • Event URL format: https://kalshi.com/events/{event_id}
Kalshi events often have many sub-markets (e.g. “Who wins the Senate seat?”). When using the Compare endpoint, the sub_markets array lists all outcomes for multi-outcome events.

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Limitless

Fast-growing on-chain prediction market. Updated every 60 seconds (live).
  • Platform code: limitless
  • Market type: Binary
  • Price range: 0.00 – 1.00
  • Volume currency: ETH / USDC
  • Event URL format: https://limitless.exchange/events/{event_id}

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OpinionTrade

Indian prediction market. Ingested every 15 minutes.
  • Platform code: opiniontrade
  • Market type: Binary and categorical
  • Volume currency: INR
  • Event URL format: https://app.opinion.trade/detail?topicId={event_id}

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Price normalization

All prices are normalized to a 0.0 – 1.0 probability scale regardless of the source platform: 
no_price = round(1 - yes_price, 4)
A yes_price of 0.65 means the market implies a 65% probability of the event resolving YES.