Bybit to Shift Open Interest Reporting to Single-Counted Method

• Bybit will move to single-counted open interest reporting from June 11, 2026.
• The change will make displayed OI figures appear lower, but traders’ positions, margins and risk exposure will not change.

Bybit is changing how it reports open interest across its derivatives markets. The Dubai-based exchange said the update will take effect on June 11, 2026, moving its methodology from bilateral, or dual-sided, counting to unilateral, single-counted measurement. The change sounds technical, and in a way it is. But it matters for traders who watch open interest as a core signal for leverage, positioning and market crowding. Bybit said the shift is intended to bring its reporting framework closer to methods commonly used in global derivatives markets, where open interest is generally counted once rather than from both sides of the trade. Open interest is one of those metrics that often gets quoted quickly, sometimes too quickly. It shows how much exposure remains open in a derivatives market, but the way it is counted can change how large that market appears on screen. For crypto traders comparing exchanges, that difference is not trivial. A platform using dual-sided counting can appear to show much higher OI than a venue using single-counted reporting, even if the underlying activity is similar. Displayed OI may fall, but trader exposure stays the same Under Bybit’s current bilateral method, matching long and short positions can be counted separately. With the new unilateral system, the same market activity will be counted only once. As a result, displayed open interest figures may fall by around 50 percent, though this is a reporting change rather than a reduction in actual market activity. That 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 a trader’s book will not be mechanically reduced or rebalanced because of it. For analysts, however, the visual break will matter. Historical charts may look different before and after the switch, and trading models that treat OI changes as a momentum or leverage signal could need adjustment. A sudden drop in reported OI after June 11 should not automatically be read as deleveraging. It may simply reflect the new calculation method. Position limits will also be adjusted to preserve the same practical thresholds. Since unilateral OI is expected to be roughly half the previous bilateral figure, Bybit will double the applicable rate for each contract when calculating limits. This is designed to keep the real trading environment stable. Without that adjustment, a lower reported OI base could distort how position limits are applied. Bybit’s approach means the headline metric changes, while the practical limits for traders remain aligned with the previous framework. API users get new fields before the switch The updated OI displays will appear across several parts of the platform, including the Markets page, trading-page indicators, contract detail pages, open interest pages and in-app candle data panels. The change will apply to perpetuals, futures and options. For institutional users, developers and data vendors, the API update is the part to watch. Bybit will introduce two new fields: singleOpenInterest, which shows unilateral open interest, and singleOpenInterestValue, which shows the same value in dollar terms. Those fields 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 the methodology changes in the public interface. The broader point is comparability. Crypto derivatives markets have matured quickly, but data standards still vary across venues. OI is used to judge liquidity, crowded positioning, liquidation risk and sentiment. If exchanges calculate it differently, traders can end up comparing numbers that look similar but do not measure exactly the same thing.