API & Developers

Polymarket Market Data API: Historical Books for Developers

A developer guide to Polymarket market data APIs, including live CLOB data, historical snapshots, resolved markets, and backtesting workflows.

A Polymarket market data API can mean live CLOB data, historical snapshots, or resolved market metadata. Developers usually need different APIs for live execution and historical research.

Market Data Types

  • Live order book state
  • Historical order book snapshots
  • Resolved market outcomes
  • Reference prices for crypto event markets
  • Bulk exports for offline analysis

Live API vs Historical API

NeedUse
Place or cancel ordersPolymarket CLOB API
Replay past order booksPolyHistorical API
Backtest resolved marketsHistorical snapshots plus outcomes
Download research datasetBulk export or Parquet data

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