Data catalog
Polymarket 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. What the whole archive holds is described on Polymarket historical data, the price lines behind every market on Polymarket price history, and any series can be pulled as a Polymarket dataset.
Data as of 2026-09-17
Categories
Most active series
The ten series with the highest traded volume in the archive.
FIFA World Cup
daily · 14,077 markets · $1.5B
Fed Decision
monthly · 23 markets · $782.7M
What price will Bitcoin hit (Monthly)
monthly · 211 markets · $250.6M
Crude Oil (CL) hit
monthly · 228 markets · $172.2M
MLB
daily · 56,155 markets · $164.8M
ATP
daily · 43,417 markets · $112.1M
Bitcoin above (Weekly)
daily · 2,195 markets · $99.3M
Counter Strike
daily · 8,762 markets · $74.8M
League of Legends
daily · 4,140 markets · $64.0M
UEFA Champions League 2025
daily · 471 markets · $60.0M
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, with their trades and candles collected alongside. 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 under CC BY 4.0, so the real format can be inspected before signing up. Seven complete events, backtestable offline with the SDK, are on GitHub at polymarket-historical-data. On Hugging Face: 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 1M rows per day with full API and full archive access, no card required.
$ pip install marketlens