PolyOrderbooks
Historical Polymarket L2 order books
API · Python
PolyOrderbooks is a read-only REST API and official Python SDK for historical Polymarket data — full L2 bid/ask depth, prices, volume, liquidity, and spread metrics, not just midpoints. Replay what the book actually looked like to estimate fills and slippage in backtests.
The hosted archive indexes 819k+ markets and 779M+ order book snapshots, with open markets snapshotted every second and 1-second resolution available on paid plans. Discovery APIs search markets by slug, outcomes, and resolution status, with a resolved-markets archive that includes winners.
Queries run against the archive, not live Polymarket, so your research never touches production rate limits. Public developer docs and OpenAPI spec, a free Starter tier, and enterprise S3 export in Parquet, CSV, or JSON.
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Information
- Developer
- PolyOrderbooks
- Category
- Data Feeds
- Price
- Free / from $19/mo
- Size
- —
- Languages
- EN
- Age Rating
- 4+
- Compatibility
- API, Python
- Source status
- Live site
- External link
- polyorderbooks.com ↗