PolyOrderbooks

What it does

Backtest Polymarket strategies against the order book that actually existed. PolyOrderbooks provides historical L2 bid/ask depth, prices, and liquidity data through a REST API and Python SDK. Query 1-second historical snapshots, analyze spreads and depth, and model realistic fills instead of relying only on midpoint price history. Free tier available.

1-second Polymarket order book history for crypto markets. Full L2 bid/ask on the free Starter plan. Official Python SDK and MCP server. Pro from $19/mo.

Full bid/ask depth for Polymarket crypto markets, captured every second. Query books, prices, and liquidity through a REST API, Python SDK, or MCP server — not just midpoints. 897k order book snapshots at 1-second resolution, registered on Zenodo (10.5281/zenodo.22084114, August 2026) with a DataCite DOI and CC BY 4.0 licence. Free to download — valid in a data availability statement. Paid archives typically offer no persistent identifier. Polymarket's API is great for live prices. Typical historical archives sample once per minute. We capture full bid/ask depth every second — built for crypto backtests and final-minute settlement research. Three steps. One API. Your client never talks to…from polyorderbooks.com

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