Best Free Polymarket Data API
Free Polymarket Data Options
There are limited options for accessing Polymarket historical data for free. Here's how they compare:
Free Tier Comparison
| Feature | PolyHistorical Free | Polymarket CLOB API | Dune Analytics |
|---|---|---|---|
| Historical Order Books | ✓ Sub-second snapshots | ✗ Live only | ✗ |
| Resolved Market Data | ✓ | Limited | ✓ On-chain only |
| Order Book Depth | ✓ Full depth | ✓ Current only | ✗ |
| Rate Limit | 60 req/min, 1K/day | Varies | Query-based |
| Auth Method | API key | Wallet signature | Account |
| Credit Card Required | No | No | No |
What You Get Free on PolyHistorical
- BTC, ETH, and SOL Up/Down prediction market data
- Recent market history: Last 50 markets (5m/15m), 24 (1h/4h), 5 (24h)
- Full order book depth on every snapshot
- Sub-second granularity (300ms intervals)
- No credit card, no trial period — free means free
Quick Start
curl -H "X-API-Key: YOUR_FREE_KEY" \
"https://api.polyhistorical.com/v1/markets?coin=BTC&active=true"Sign up at polyhistorical.com/signup to get your free API key in 30 seconds.