Open Interest. How much money is actually in the trade.
Open interest is the number of derivative contracts currently open. Unlike volume, which counts every transaction, open interest counts positions that still exist, so it measures commitment rather than activity.
Its usefulness comes almost entirely from reading it alongside price, because the same open interest number means opposite things depending on which way price is going.
The four combinations worth knowing
Price up with rising open interest means new money is buying, which supports the move. Price up with falling open interest means shorts are covering, which is a weaker foundation because the buying stops when the shorts are done. Price down with rising open interest means new shorts are being opened. Price down with falling open interest means longs are giving up. Two of those describe fresh conviction; two describe positions being closed.
Open Interest in a strategy
A rising market backed by rising open interest has new participation behind it.
A sharp rally on falling open interest is closing pressure, not accumulation.
Open interest climbing much faster than price is a sign of leverage stacking into the market.
A steep drop in open interest marks positions being flushed, often alongside liquidations.
Only take breakouts that new money is behind
Breakout strategies fail most often on moves driven by shorts covering. Open interest is what separates those from real participation.
- IFPrice closes above the highest high of the last 20 days
- ANDOpen interest has risen 5% or more over the previous 4 hours
- ANDVolume on the breakout candle is at least 1.5x its 20-period average
- ANDThe move is not occurring within 30 minutes of a funding settlement
The open interest condition is the one doing the real filtering. A breakout on rising open interest means new longs are opening positions. The same breakout on falling open interest means shorts are closing, and that buying disappears the moment they are done, which is the classic failed breakout. The funding-settlement clause exists because prices often jump around settlement for reasons that have nothing to do with a breakout.
Each derivatives venue publishes current open interest per contract, usually alongside a historical series at fixed intervals.
Cross-venue totals show whether positioning is building market-wide or only on one exchange.
Some venues split open interest by collateral type, which changes how a squeeze propagates.
The number is meaningless on its own
Open interest read without price direction tells you nothing at all. It is a confirming input, not a standalone signal, and any strategy using it needs the price context in the same condition.
Let Open Interest pull the trigger for you.
Set it up in paper mode in minutes. No code, no card, no custody.
- Confirming a trend
- Spotting a squeeze
- Leverage building up