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Polymarket Historical Data API

Kwery provides a production-ready Polymarket API with full-depth historical order books, OHLCV candles at 5m–24h, and snapshot-at-timestamp reconstruction. Access normalized Polymarket CLOB data via REST API—no scraping, no S3 dumps. Built for quant researchers and trading bots.

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What you get

Full bid/ask depth (full + incremental diffs)
OHLCV at 5m, 15m, 1h, 4h, 24h
Snapshot-at-timestamp reconstruction
Up/Down binary markets for BTC, ETH, SOL, XRP
Single normalized schema with other venues (Kalshi, Binance, etc.)

Sample request & response

GET /v1/snapshots/polymarket_btc-up/at?time=2026-03-04T14:00:00Z

{
  "snapshots": [{
    "time": "2026-03-04T14:00:00Z",
    "mid_price": 0.487,
    "orderbook_up": {
      "bids": [{"price": 0.485, "size": 9012}],
      "asks": [{"price": 0.488, "size": 8731}]
    }
  }]
}

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