What is open interest and why does it move?
Open interest is the total value of all futures contracts currently open. It tells you how much money is actively betting on a price direction — and whether that conviction is growing or fading.
What open interest actually measures
Think of open interest as the size of the crowd. Every futures contract requires two people — a buyer (long) and a seller (short). Open interest counts how many of these paired contracts are currently open and unresolved.
When OI rises, new money is entering the market — new longs and shorts are opening positions. When OI falls, money is leaving — existing positions are being closed.
The four combinations to know
Why sudden OI changes matter
A sudden spike in OI often precedes a significant price move — because new money is taking a strong directional bet. A sudden drop in OI often marks the end of a trend — as positions are unwound and conviction drains away.
Watch the OI history on Deriflux. If OI has been rising steadily for several hours alongside price, the trend has conviction. If price is rising but OI is flat or falling, be cautious — it may be a short squeeze rather than genuine demand.
Exchange differences
Binance typically has the largest OI of any exchange. Hyperliquid, being a decentralised exchange (DEX), has been growing its share — which is a meaningful signal about increasing on-chain adoption. When Hyperliquid OI grows significantly relative to Binance, it often reflects more sophisticated traders moving on-chain.