Historical market depth,
captured the moment it existed.
Prediction markets reprice continuously — and their order books vanish the instant a market settles. Polybook records them second by second, so you keep the full historical record after the market is gone.
Historical data since March 2026 · 8 streams · CSV, Parquet, REST API
What we record
Every market, from pre-open to settlement, at one-second resolution — a complete historical dataset you can query.
| Symbols | BTC · ETH · SOL · XRP |
|---|---|
| Market lengths | 5 minutes · 15 minutes |
| Recorded per row | best bid and ask (both outcomes), resting sizes, freshness, market phase |
Complete capture
Purpose-built collectors watch every market through its entire life — recording starts before the market opens, so nothing is missed at the boundaries.
Honest data
Values are recorded as they happened or not at all. If the feed was stale, the data says so — your models learn from what the market really looked like.
Full history kept
Market IDs, settlement results and capture details are stored alongside the numbers — long after the market itself is deleted from the venue.
Simple to use
Standard formats, one consistent schema, an easy HTTP API.
Start in minutes
Download CSV or Parquet files, or call the REST API with any HTTP client. One schema across everything — learn it once.
Know what you're working with
Data freshness and window completeness are part of the data itself. Every analysis is reproducible, and defensible.
See the data first.
Download real rows from the archive — the same data, the same format, as every paid plan.
Get sample data →