Best Polymarket Backtesting API: What to Look For
A buyer-focused guide to choosing the best Polymarket backtesting API for historical order books, resolved markets, slippage, and strategy replay.
The best Polymarket backtesting API is the one that lets you test against historical market conditions instead of simplified prices. For prediction markets, that means order book depth, spreads, timestamps, and resolved outcomes.
Required Features
- Historical order book snapshots
- Full bid and ask depth
- Resolved market metadata
- Reference prices for crypto markets
- Pagination and export options for large tests
Nice-to-Have Features
- Strategy replay workflow
- Bulk CSV or Parquet export
- Clear API documentation
- Free tier for validation
- Rate limits suitable for automated research
Evaluation Table
| Question | Why it matters |
|---|---|
| Does it include full depth? | Needed for slippage and capacity |
| Does it include resolved markets? | Needed for outcome-aware backtests |
| Is it API-first? | Needed for repeatable research pipelines |
| Can I export data? | Useful for notebooks and larger studies |