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- Bybit will transition to individually calculated open interest reporting as of June 11, 2026.
- The change will cause the OI numbers displayed to appear lower, but traders’ positions, margins and risk exposure will not change.
Bybit It changes how open interest is reported across derivatives markets. The Dubai-based exchange said the update will take effect on June 11, 2026, moving its methodology from binary or double counting to single measurement and single counting.
The change sounds technical, and to some extent it is. But it is important for traders who view open interest as a primary signal of leverage, positioning and market congestion. Bybit said the shift aims to bring its reporting framework closer to methods commonly used in global derivatives markets, where open interest is generally calculated once rather than from both sides of a trade.
Open interest is one of those metrics that often gets quoted quickly, sometimes too quickly. It shows the amount of exposure that remains open in the derivatives market, but the way it is calculated can change the size of this market that appears on the screen.
For cryptocurrency traders comparing exchanges, this difference is not trivial. A platform that uses double-sided counting can appear to show much higher visual interest than one that uses single reports, even if the underlying activity is similar.
The level of OI offered may decrease, but the trader’s exposure remains the same
Under Bybit’s current binary method, the matching of long and short positions can be calculated separately. With the new single system, the same market activity will be counted only once. As a result, open interest numbers displayed may decrease by approximately 50 percent, although this is a change in reporting and not a decrease in actual market activity.
This distinction is important. Bybit said traders’ actual positions, margin requirements, profit and loss calculations, position limits and risk exposure will not be affected. In other words, the screen may show a lower OI number after June 11, but the trader’s book will not be mechanically reduced or rebalanced because of it.
However, for analysts, a visual break will be important. Historical charts may look different before and after the switch, and trading models that treat OI changes as a signal of momentum or leverage may need to be adjusted.
The sudden decline in OI reported after June 11 should not automatically be read as deleveraging. It may simply reflect the new calculation method.
The position limits will also be adjusted to keep the same practical limits. Since the unilateral OI is expected to be approximately half of the previous binary figure, Bybit will double the rate applied to each contract when calculating the limits.
This is designed to keep the real trading environment stable. Without this adjustment, the low reported base OI may distort how position limits are applied. Bybit’s approach means that the key metric changes, while the practical limits for traders remain consistent with the previous framework.
API users get new fields before switching
Updated AI displays It will appear across several parts of the platform, including Markets page, Trading page Indicators, contract detail pages, open interest pages and candlestick dashboards within the app. The change will be applied to Perpetuals, futures and options.
For enterprise users, developers, and data vendors, updating the API is the part to keep an eye on. Bybit will introduce two new fields: singleOpenInterestindicating open interest on one side, and singleOpenInterestValuewhich shows the same value in dollars.
These areas should help trading desks, analytics providers, and risk teams separate old-style and new-style readings more cleanly. It also gives integrators time to update dashboards, backtesting systems, and automated monitoring tools before changing the methodology in the public interface.
The broader point is comparison. Cryptocurrency derivatives markets have matured rapidly, but data standards still vary across locations. OI is used to judge liquidity, crowded positions, liquidation risk and sentiment. If exchanges calculate them differently, traders may end up comparing numbers that look similar but don’t measure exactly the same thing.
