Bybit Adjusts Open Interest Calculation Method

Bybit has announced that, effective June 11, the method for calculating open interest (OI) will change from a bilateral to a unilateral counting approach, and API users are advised to update their API fields accordingly. This change aims to enhance market transparency and align Bybit’s methodology with other crypto derivatives platforms, facilitating cross-platform data comparison for users and analysts alike. Under the new calculation method, the displayed open interest value will decrease, but actual market activity remains unchanged. This adjustment reflects only a change in calculation methodology; individual users’ positions, margin requirements, profit-and-loss calculations, and position limits remain unaffected. Additionally, the system will automatically adjust fees to maintain existing position limit levels. Starting June 11, updated open interest data will be displayed on Bybit’s market data page, trading page, and mobile app. API users must complete their system updates prior to the effective date. Example: For the BTCUSDT perpetual contract, if there are simultaneously 1,000 BTC of long positions and 1,000 BTC of short positions, the displayed open interest will change from 2,000 BTC to 1,000 BTC.