Pendulum Flow
@pendulumflow.com
Free hourly Polymarket orderbook data in Parquet. Every era carries the individual price changes, not only the periodic depth snapshots. The current era is our own capture: several machines record at once and the merge keeps what they heard, with the duplicates taken out. The earlier eras are mirrors of third-party captures.
Pendulum Flow's Company Logos
Pendulum Flow's Brand Colors
Hex Code
Color name
RGB
HSL
CMYK
#C0392B
Tall Poppy
192, 57, 43
6, 63, 46
0, 70, 78, 25
#15181D
Woodsmoke
21, 24, 29
218, 16, 10
28, 17, 0, 89
#F0D9B0
Double Colonial White
240, 217, 176
38, 68, 82
0, 10, 27, 6
About Pendulum Flow
Polymarket Orderbook Archive is a free data service operated by Pendulum Flow, providing historical Polymarket orderbook captures for research, analysis, and trading applications. Its archive contains billions of recorded events, published in hourly Parquet files and available without an account, API key, or rate limit. The newest records come from Pendulum Flow’s own multi-machine capture, which combines observations, removes duplicates, and preserves microsecond arrival times. Earlier periods are supplied by mirrored third-party captures and are identified separately by source and quality.
Users can download files directly or work with them through tools such as DuckDB and PyArrow. The archive also provides checksums, manifests, format documentation, coverage audits, beginner guidance, and examples for uses including backtesting, depth analysis, slippage estimates, and wallet performance research. Its historical coverage includes listed gaps, and the project invites contributions of missing or higher-quality recordings. The service is free to use and supported by donations; users can also contact the operator with feedback, data contributions, or feature requests.
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