What Is Open Interest in Crypto Futures?

Open interest (OI) is one of the most useful — and most misread — numbers in futures trading. It is simply the total value of all futures contracts that are currently open. Here is what it tells you and how to use it.

Open interest vs volume

These get confused constantly. Volume is how many contracts changed hands in a period; a contract opened and closed in the same hour still adds to volume. Open interest is how many contracts are still open right now. If you open a position and someone else takes the other side, OI rises by one. When either of you closes, OI falls.

Reading OI with price

• Price up + OI up — new longs are driving the move; bullish conviction.
• Price up + OI down — shorts are covering, not new buying; the rally may be weaker than it looks.
• Price down + OI up — new shorts piling in; bearish conviction.
• Price down + OI down — longs capitulating; a flush that can mark a bottom.

Why it matters for liquidation risk

High open interest means a lot of leveraged positions are stacked up — and when price moves sharply, those positions get liquidated in cascades, accelerating the move. Spikes in OI often precede volatile liquidation events. It also feeds the funding rate: lopsided OI pushes funding to extremes.