Historical Market Data

o2 publishes historical market data as free, downloadable files at data.o2.app. No account or API key is required - browse it in your browser and download files directly.

Available data

Daily files are provided for each market: ETHUSDC, FUELUSDC, wBTCUSDC, and USDTUSDC.

Dataset	Description
Trades	Every individual trade.
Aggregated Trades	Trades from a single taker order executed at the same price, merged into one row.
Candlesticks (K-lines)	OHLCV price bars at 1m, 5m, 1h, and 1d intervals.

Data is available from January 2026 and updated daily (around 02:00 UTC) with the previous UTC day's data.

File organization

Files are grouped by dataset, then market (and interval, for candlesticks). Open data.o2.app to browse, or download a file directly by its path:

spot/daily/trades/ETHUSDC/ETHUSDC-trades-2026-07-01.zip
spot/daily/aggTrades/ETHUSDC/ETHUSDC-aggTrades-2026-07-01.zip
spot/daily/klines/ETHUSDC/1h/ETHUSDC-1h-2026-07-01.zip

Each file is a ZIP containing a single CSV. Alongside every ZIP is a .CHECKSUM file with its SHA-256 hash so you can verify the download.

curl -O https://data.o2.app/spot/daily/klines/ETHUSDC/1h/ETHUSDC-1h-2026-07-01.zip

File formats

Every CSV includes a header row.

Trades

Column	Description
trade_id	Unique trade identifier.
timestamp_ms	Trade time (Unix milliseconds).
price	Execution price.
qty	Base asset quantity.
quote_qty	Quote asset quantity.
is_buyer_maker	Whether the buyer was the maker.
is_self_trade	Whether both sides belong to the same account.

Aggregated Trades

Column	Description
agg_trade_id	Aggregated trade identifier.
price	Execution price.
quantity	Total base asset quantity.
first_trade_id	First trade ID in the aggregate.
last_trade_id	Last trade ID in the aggregate.
timestamp	Trade time (Unix milliseconds).
count	Number of trades aggregated.
is_buyer_maker	Whether the buyer was the maker.
is_best_match	Whether the trade was a best-price match.

Candlesticks (K-lines)

Column	Description
open_time	Bar open time (Unix milliseconds).
open	Open price.
high	Highest price.
low	Lowest price.
close	Close price.
volume	Base asset volume.
close_time	Bar close time (Unix milliseconds).
quote_volume	Quote asset volume.
trade_count	Number of trades in the bar.

For live market data, see Markets and the Market Data API.