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Available on all plans (Free tier included).
Historical orderbook snapshots, top-of-book timeseries, and trade data for Kalshi markets. Data available from March 19, 2026 onward. Returns native Kalshi data with YES and NO sides. Data becomes available approximately one hour after it occurs.

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What you can build

  • Backtesting: replay historical orderbooks and trades to validate trading strategies before deploying capital
  • Price charts: build custom candlestick or mid-price charts from top-of-book snapshots
  • Liquidity analysis: measure how bid/ask depth and spreads change around major events like FOMC decisions or economic releases
  • Execution quality: compare your historical fills against the orderbook at time of execution to measure slippage
  • Volatility models: derive implied volatility from orderbook snapshots and track how it evolves over time
  • Trade flow analysis: identify patterns in trade size, frequency, and taker side leading into event resolution

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Pagination

All historical endpoints use cursor-based pagination. Pass pagination_key from the previous response to get the next page. 
{
  "pagination": {
    "limit": 100,
    "count": 100,
    "has_more": true,
    "pagination_key": "eyJo..."
  }
}