DepthFeed
DepthFeed provides historical order-book and price data for prediction markets such as Polymarket, Kalshi, and Limitless. It captures full bid and ask depth on both sides at every change, rather than just sampling top-of-book or last trade prices. The service offers a clean REST API and live WebSockets with normalized JSON schemas, epoch-millisecond timestamps, and keyset pagination. It is engineered to help quantitative traders backtest strategies against real liquidity and slippage conditions.
Checked on Sep 30, 2026.
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