What is open interest?

Open interest is not volume

Volume counts what changed hands over a period. Open interest counts what is still held right now. They answer different questions and often move in opposite directions.

If you open a position and someone else closes theirs against you, volume rises and open interest does not change: the contract simply moved from one owner to another. Open interest rises only when a NEW contract is created — a new buyer and a new seller both entering.

What rising and falling mean

Open interest on its own is neutral: it is a headcount, not a direction. Its meaning comes from what price is doing at the same time.

• Price up, open interest up — new money is backing the move. Fresh longs are being opened.
• Price down, open interest up — new short exposure is being built. Also new money, in the other direction.
• Price up, open interest down — shorts are closing. The move is driven by people leaving, not arriving.
• Price down, open interest down — longs are closing. Same logic, mirrored.

Why sharp drops matter

Open interest falls when positions close, and positions close in two very different ways: because someone decided to, or because the exchange decided for them.

A liquidation cascade shows up as a fast, deep drop in open interest alongside a violent price move. That combination is a fingerprint: it says the move was made of forced exits rather than fresh conviction, which is why such moves often retrace as quickly as they came.

Reading it across coins

Absolute open interest scales with the size of the coin: comparing BTC to a small alt in dollars tells you mostly which is bigger. The comparable number is the CHANGE — how much a coin's open interest grew or shrank over a period, in percent.

That is why our board shows both: the dollar figure for scale, and the 24-hour change for comparison.

Common questions

Is high open interest bullish or bearish?

Neither on its own. It measures how much money is committed, not which way. The direction comes from what price does while open interest changes.

Why does open interest fall during a crash?

Because positions are being closed — often involuntarily. Liquidations close positions at market, which removes contracts and drops open interest fast.

Can open interest be higher than the coin supply?

Yes. Futures are contracts, not coins: they can be created in any quantity as long as someone takes each side. This is normal and is one reason futures markets can move price far more than the underlying spot volume suggests.