Resolved Markets
Historical Polymarket order book data API
Polymarket's public API doesn't serve historical order book depth. Resolved Markets does. It has captured 4.2B+ order book snapshots across 184 recurring and event series since March 2026: crypto up/down (BTC, ETH, SOL, XRP, DOGE, HYPE, BNB), sports, weather, economics, equities and social markets, plus Hyperliquid perpetual futures books. Crypto up/down markets are captured every 100 ms.
Use it to backtest against the real book instead of the mid price, replay markets second by second, or give an AI agent live and historical market data through a hosted MCP server. Access is by REST, WebSocket, CLI or MCP, with CSV export on higher tiers.
The free tier covers all crypto markets with 5,000 credits a month and needs no card. Paid plans start at $17/mo.
