Open Interest

Open interest is the running total of outstanding derivative contracts that have been opened but not yet offset or settled. It increases when a new buyer and new seller create a fresh contract, and decreases when existing holders close. As a market-structure gauge it shows the size of committed leverage: rising OI with rising price suggests new longs, rising OI with falling price suggests new shorts, and falling OI signals position unwinding. Read alongside funding and price, OI hints at how crowded and leveraged a move is — and therefore how much fuel exists for a liquidation cascade.

In plain English — Open interest (OI) counts how many futures or perpetual contracts are live in the market right now — every open position contributes, and a contract leaves OI only when both sides close it. Unlike volume (which counts all trades), OI reflects how much capital is committed and at risk. Rising OI means new money and new positions; falling OI means positions are being closed out.

BTC perp open interest climbs from $8B to $12B while price grinds up slowly. That growing OI shows fresh leverage entering — which can fuel a continuation, but also stacks more positions that could be liquidated if price snaps back.