Open interest (OI) is the size of futures positions that are still open. It shows how much leveraged positioning is sitting in the market right now.
Open interest vs volume
- Volume is how much traded over a period. It's a flow.
- Open interest is what's still open. It's a stock.
Every futures position has a long on one side and a short on the other, so a rise in OI alone can't tell you which side grew.
| What happened | Open interest |
|---|---|
| A new long meets a new short | Rises |
| An existing position changes hands | Unchanged |
| A long and a short both close | Falls |
| A forced liquidation | Falls |
Reading it with price
These are common readings, not rules.
| Price | Open interest | Common reading |
|---|---|---|
| Up | Up | New money coming in on the long side |
| Up | Down | Shorts closing out as price rises |
| Down | Up | New shorts coming in |
| Down | Down | Longs closing out as price falls |
Why it matters
High open interest means a lot of leverage. With a lot of leverage, small moves can set off a chain of liquidations. A sharp drop in OI after a big move usually means positions have been flushed out.
Common mistakes
- Reading it as direction. A rise doesn't tell you whether price goes up or down.
- Ignoring the unit. OI can be quoted in coins or dollars. In dollars, it grows when price rises even if no new positions open.
- Using one exchange as the whole market. Numbers differ by venue.
What to read alongside it
Use funding rates and the long/short ratio for the lean, and the liquidation map for where forced closes sit.
The WhaleCue Sectors screen lists coins with surging open interest every day.
FAQ
Is falling open interest bad? Not by itself. It means positions closed. With less leverage, the market can actually calm down.
Does spot have open interest? No. It exists only in contract markets such as futures and options.
This isn't investment advice. Always make your own decisions.