PolyHistorical — Polymarket Order Book Data API

> 300ms order book snapshots for every BTC, ETH, and SOL Polymarket market. Full bid/ask depth, 13,000+ resolved markets. Built for traders, bots, and researchers.

PolyHistorical is an independent historical-data API for Polymarket prediction markets. It is not affiliated with, endorsed by, or connected to Polymarket or any exchange. The product captures the full Level-2 order book at 300ms intervals for every active market, including bid/ask depth, UP/DOWN token prices, and BTC/ETH/SOL reference prices from Binance and Chainlink.

What you get

• **Order book depth** — every bid, every ask, every price level, for both UP and DOWN tokens. Compute realistic slippage, model fills, measure liquidity.
• **300ms snapshots** — sub-second resolution lets you see depth shifts that minute-level candles hide.
• **REST API** — sub-50ms responses, pagination, filtering, rate limits suitable for both manual research and automated workloads.
• **Strategy Replay (Pro)** — pick a resolved market, define entry/exit rules in dropdowns, watch the market replay tick-by-tick with your strategy applied. PnL, drawdown, slippage, and win rate computed from real fills on the actual order book.
• **Complete archive** — markets stay available forever after resolution, with winners, final volumes, and settlement metadata preserved.

Markets covered

• BTC Up/Down — 5m, 15m, 1h, 4h, 24h
• ETH Up/Down — 5m, 15m, 1h
• SOL Up/Down — 5m, 15m, 1h

Reference prices sourced from Binance and Chainlink. 13,000+ resolved markets in the archive.

Pricing summary

• **Starter** — Free, no credit card. BTC last 50 (5m & 15m), last 24 (1h & 4h), last 5 (24h). 60 req/min, 1,000 req/day.
• **Pro** — $11/month. All BTC, ETH, SOL markets, unlimited history, Strategy Replay, priority support. 300 req/min, 50,000 req/day.
• **Enterprise** — Custom. Custom endpoints, dedicated infra, flexible rate limits, hands-on onboarding.

See [pricing.md](https://polyhistorical.com/pricing.md) for full details.

FAQ

Is PolyHistorical affiliated with Polymarket?

No. PolyHistorical is an independent data provider, not affiliated with, endorsed by, or connected to Polymarket or any exchange.

How granular is the snapshot data?

Full order book state at 300ms intervals for every active market, including bid/ask depth, UP/DOWN token prices, and BTC/ETH/SOL reference prices from Binance and Chainlink.

Is the API built for automated access?

Yes. Sub-50ms responses, pagination, filtering, and rate limits designed for both manual research and automated workloads.

What markets are supported?

BTC Up/Down across 5m, 15m, 1h, 4h, and 24h timeframes; ETH and SOL across 5m, 15m, and 1h. Each market includes complete order book history from open to resolution.

How is this different from candle/OHLC data?

Candles summarize price movement. PolyHistorical gives you the full order book — every bid, every ask, every price level. You can simulate realistic fills with actual slippage, measure spread dynamics, and see depth shifts that candles hide.

Can I try before paying?

Yes. The free Starter tier gives you access to recent BTC markets with full order book depth and 300ms resolution. No credit card required.

Can I see how my strategy would have played out on a past market?

Yes. Pro includes Strategy Replay. Pick any resolved market, define entry/exit rules with dropdowns, and watch the market replay tick-by-tick with your strategy applied. PnL, drawdown, slippage, and win rate are computed from real fills on the actual order book, not estimates.