REST API Open Interest

REST API - Open Interest Data

Open interest data shows the total value of outstanding derivative contracts.

GET

/download

Download Open Interest Data

Download hourly open interest data files for futures trading pairs.

Example: Download BTCUSDT Open Interest

bash

curl "https://api.cryptohftdata.com/download?file=binance_futures/2025-08-01/20/BTCUSDT_open_interest.parquet.zst&api_key=your-api-key-here" \
  -o BTCUSDT_open_interest_20.parquet.zst

Futures Only

Open interest data is only available for futures/derivatives exchanges.