Bybit will update the Open Interest (OI) calculation method on Jun 11, 2026.

OI will change from double-sided to single-sided calculation. As a result, displayed OI values will be around 50% lower than current levels. The adjustment does not reflect significant changes in actual OI levels on Bybit. This is a display update only and does not indicate lower market activity.

Your positions, margin, P&L and trading experience will not be affected.

Example: OI display update

If a BTCUSDT contract has:
• 1,000 BTC in long positions
• 1,000 BTC in short positions

Current method:
OI = 2,000 BTC

New method:
OI = 1,000 BTC

The displayed OI value will appear lower, but actual market activity remains unchanged.

Position limits remain unchanged

Position limits based on OI will continue to work the same way after the update.

Example:
• Before: OI = 10,000 BTC, rate = 10%, limit = 1,000 BTC
• After: OI = 5,000 BTC, rate = 20%, limit = 1,000 BTC

Risk parameters will be updated automatically to reflect the new calculation method.

API update

Starting Jun 11, 2026, the following API fields will support single-sided OI:
• singleOpenInterest
• singleOpenInterestValue

The following areas on Bybit will display updated unilateral OI figures:

• Markets page — The OI chart and figures for Perpetuals, Futures and Options will reflect single-sided open interest.

• Trading page — The OI indicator on the trading interface will display the new unilateral value.

• Contract detail and Open Interest pages — OI data will display single-sided figures.

• App — Trading page (K-line/Data panel) — The Open Interest value in the data panel will reflect unilateral open interest for the selected contract and period.

Please update your integrations before the effective date.

If you have any questions, please contact our Customer Support.