Data catalog
Polymarket historical data catalog
Marketlens records full L2 order books for every recurring Polymarket market and for any event that sustains real trading volume. Books are captured at full depth with millisecond price changes, alongside trades, candles, and resolution outcomes. This catalog covers the actively collected series, grouped by category, with standalone events cataloged separately.
Data as of 2026-08-16
Categories
Most active series
The ten series with the highest traded volume in the archive.
FIFA World Cup
daily · 14,077 markets · $1.5B
FOMC
monthly · 18 markets · $748.5M
Bitcoin Hit Price Monthly
monthly · 160 markets · $250.6M
Crude Oil (CL) hit
monthly · 193 markets · $172.0M
MLB
daily · 23,149 markets · $118.0M
BTC Multi Strikes Weekly
daily · 1,808 markets · $99.2M
ATP
daily · 25,997 markets · $68.9M
Ethereum Hit Price Monthly
monthly · 144 markets · $57.3M
WTA
daily · 13,291 markets · $32.6M
Bitcoin Hit Price Weekly
weekly · 355 markets · $25.5M
How the data is collected
Actively traded markets get a dedicated WebSocket connection to Polymarket's CLOB: full book snapshots anchor a stream of price change deltas, so the book at any millisecond reconstructs exactly. The longest dated event books are captured as full depth snapshots at regular intervals. The format, fields, and replay endpoints are documented in the order book docs, and full markets download as Parquet via exports.
Free sample datasets
Slices of this archive are published openly on Hugging Face under CC BY 4.0, so the real format can be inspected before signing up. A full day of BTC 5 minute book depth, every market Polymarket listed on the 2026 World Cup final, and the settled outcome of every resolved market in the archive. Each ships snapshots, deltas and trades as Parquet, with the reconstruction documented on the dataset card.
Both order book samples are archived on Zenodo with citable DOIs, so a paper can reference the exact files at a fixed version: 10.5281/zenodo.21933084 for the Bitcoin day and 10.5281/zenodo.21933086 for the final, and mirrored on Kaggle.
Try it
Query any of it with one API key
The free tier includes 5M rows per day with full API and full archive access, no card required.
$ pip install marketlens