Open interest

Open interest (OI) is the total count of active contracts — longs matched against shorts — that remain open at any given moment. Every new matched trade between two new participants increases OI by one contract; closing an existing position decreases it by one. OI is distinct from trading volume, which counts every transaction regardless of whether it opens or closes.

OI is most useful in combination with price action and the funding rate:

• Rising OI + rising price: new money is entering on the long side, suggesting conviction behind the move.
• Falling OI + rising price: shorts are covering, not fresh longs opening — the rally may be less durable.
• Rising OI + falling price: new shorts are piling in, adding downward pressure.
• Falling OI + falling price: longs are exiting, capitulation or position cleanup.

Example: BTC-PERP OI climbs from 50,000 BTC to 65,000 BTC over 48 hours while price rises 12% and the funding rate turns strongly positive. That combination signals crowded longs and elevated risk of a long squeeze if price reverses.

Quantle's backtester incorporates OI data where available to help strategies avoid entering during crowded, high-liquidation-risk environments. Research output only — not investment advice.