Plain English
Open interest (OI) is the total dollar value of all open positions on a futures or perp market. Rising OI in an uptrend = new capital entering bullishly. Rising OI in a downtrend = new shorts opening. Falling OI = positions closing. One of the most-watched indicators for crypto derivatives flows.
How it actually works
Each contract has two sides — long and short — but OI counts each pairing once. When a new long opens against a new short, OI rises by one contract. When a long closes against a short, OI falls. Tracking OI per venue (Binance, Bybit, Hyperliquid, CME) shows where speculative capital is concentrated.
What it means for you
OI is best used alongside funding rate and price: rising OI + rising price + positive funding = healthy bullish trend; rising OI + falling price + positive funding = topping signal as longs trap themselves; falling OI + flat price = traders flushing out, often near a turning point. CoinGlass and Velo are the standard dashboards.
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Educational content only. Not investment, tax, or legal advice.