Live perpetual-futures open interest — the total value of leveraged positions still open. Rising OI means new leverage entering; a build-up into a stalling price is where liquidation cascades start.
Universe = Hyperliquid perps. The API also serves cross-exchange (Binance / OKX / Bybit) OI with multi-window change.
Direction beats level. Pair it with funding.
Open interest is the total notional of perp contracts currently open. Unlike volume, OI counts positions still on — a direct gauge of how much leverage and capital is committed right now.
curl -H "X-API-Key: cdk_live_yourkey" \ https://cryptodataapi.com/api/v1/derivatives/open-interest
See the open interest endpoint docs.
Open interest only becomes useful once you can see it move. The archive keeps the cross-exchange split at 5-minute resolution, so an OI build or flush is a measurable event with a timestamp rather than a number you happened to notice — and it lines up directly with the funding and liquidation series on the same clock.
curl -H "X-API-Key: cdk_live_yourkey" \ "https://cryptodataapi.com/api/v1/backtesting/snapshots?data_type=coinglass_oi&start=2026-07-01&limit=1000"
Snapshot pulls are streamed row by row, so a large limit costs bounded memory — but coinglass_oi is one of the fat types. Page it by date range rather than asking for everything at once.