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Polymarket Historical Data Download

Every Polymarket market since 2026-05-01: order books, trades, and on-chain fills as daily Parquet files, plus Chainlink prices. Start with 600 free downloads.

2026-05-01
all markets since
daily
Parquet file per market
600
free downloads
End point
/v1/polymarket/l2/{YYYY/MM/DD}/{market_slug}.parquet
/v1/polymarket/trades/{YYYY/MM/DD}/{market_slug}.parquet
/v1/polymarket/onchain_fills/{YYYY/MM/DD}/{market_slug}.parquet

What you can download

Order book snapshots and updates, tick size changes, trades, and on-chain fills for every market since 2026-05-01 (crypto Up/Down since 2026-02-01), plus Chainlink prices and TWAP. Updated daily.

The Polymarket samples come from a BTC Up/Down 5m market.

#market_slugtimestamplocal_timestampevent_typeask_pricesask_sizesbid_pricesbid_sizes
1btc-updown-5m-178433280017843325007700001784332500798498book[0.51, 0.52, ... 0.99][619.93, 162.67, ... 43595.86][0.5, 0.49, ... 0.01][393.44, 188.75, ... 43546.02]
2btc-updown-5m-178433280017843327933640001784332793377432book[0.52, 0.53, ... 0.99][116.97, 248.53, ... 42501.49][0.5, 0.49, ... 0.01][953.1, 115, ... 42705.77]
3btc-updown-5m-178433280017843327946000001784332794608325book[0.52, 0.53, ... 0.99][127.22, 253.53, ... 42501.49][0.51, 0.5, ... 0.01][5, 938.9, ... 42705.77]
4btc-updown-5m-178433280017843327956110001784332795642681book[0.6, 0.61, ... 0.99][405.88, 262.02, ... 42501.49][0.51, 0.5, ... 0.01][5, 938.9, ... 42705.77]
5btc-updown-5m-178433280017843327957510001784332795758615book[0.53, 0.6, ... 0.99][8.64, 405.88, ... 42501.49][0.51, 0.5, ... 0.01][5, 938.9, ... 42705.77]
6btc-updown-5m-178433280017843327962280001784332796237192book[0.6, 0.61, ... 0.99][405.88, 257.01, ... 42501.49][0.52, 0.51, ... 0.01][79.9, 5, ... 42705.77]
7btc-updown-5m-178433280017843327962940001784332796316292book[0.64, 0.65, ... 0.99][434.07, 674.5, ... 42501.49][0.53, 0.52, ... 0.01][5, 50, ... 42705.77]
8btc-updown-5m-178433280017843327973760001784332797385138book[0.64, 0.65, ... 0.99][229.07, 474.5, ... 42606.49][0.52, 0.51, ... 0.01][50, 5, ... 42705.77]

Order book snapshots from websocket feed. Since 2026-02-01

Download SampleSee Schema

API Example

import pandas as pd
market_slug = "btc-updown-5m-1784332800"
data_type = "l2"
date = "2026/07/18"

url = f"https://api.pmdata.dev/v1/polymarket/{data_type}/{date}/{market_slug}.parquet"
# no_l2_url = f"{url}?outcome=No"
df = pd.read_parquet(url, storage_options={"api_key": "<YOUR_API_KEY>", "User-Agent": "Mozilla/5.0"})
print(df.head())

Frequently asked questions