Open Interest
Open interest is the total number, or value, of derivatives contracts such as futures and options that are still open and have not been closed or settled. It shows how much money and leverage is committed to a market at a given moment.
How open interest works
Every futures or options contract has two sides, a buyer and a seller. When a new buyer and a new seller open a contract together, open interest rises by one. When both close their positions, it falls by one. If one trader simply hands a position to another, open interest stays the same.
In crypto, open interest is usually quoted in dollars across exchanges, often for perpetual futures, which never expire and are the most traded crypto derivative.
Open interest versus volume
Volume counts how many contracts traded during a period. Open interest counts how many remain open at the end of it. A day can show huge volume while open interest barely moves, if traders mainly open and close positions within the day.
How traders read it with price
A common rule of thumb combines open interest with price. Rising prices with rising open interest suggest new money is opening positions, often read as conviction behind the move. Rising prices with falling open interest can mean short sellers are closing positions rather than new buyers arriving.
These readings are heuristics, not reliable signals. Rising open interest only says that more positions exist; it cannot show whether the new longs or the new shorts are more aggressive, and both sides are always equal in size.
Say open interest in a coin's futures rises from 1 billion to 1.5 billion dollars in a week while the price barely moves. Much more leverage is now in the market. When price eventually breaks out in either direction, liquidations can amplify the move.
Risks and common mistakes
Very high open interest relative to market cap often means crowded, leveraged positioning, which can lead to long squeezes or short squeezes. A sudden drop in open interest during a sharp price move usually signals forced liquidations. Treat open interest as a measure of how much leverage is at stake, not as a buy or sell indicator.
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Frequently asked questions
Is rising open interest bullish?
Not by itself. It means more contracts are open, and every long has a matching short. Traders combine it with price, funding rates and other data, and even then the reading is uncertain.
What is the difference between open interest and trading volume?
Volume counts contracts traded over a period, while open interest counts contracts still open at a point in time. One measures activity, the other outstanding exposure.
Why does open interest drop during crashes?
Sharp moves trigger liquidations, which forcibly close leveraged positions. Each closed contract reduces open interest, so large drops often mark liquidation waves.
Related terms
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