**[OKX Announcement on Adjusting the Calculation Methods for Delivery Price, Exercise Price, and Settlement Price]** To further enhance the user trading experience, OKX plans to adjust the calculation methods for Delivery Price, Exercise Price, and Settlement Price on March 18, 2026. After the adjustment, the relevant prices will be calculated based on the average index price over the last 30 minutes before expiration. The system will collect and record a price point every 200 milliseconds and calculate the average based on all price points within this time window. This adjustment means that the price calculation window will be shortened from the original 1 hour to 30 minutes. To avoid ambiguity, March 18, 2026, will be the first date to adopt the 30-minute price calculation window. At the same time, all related indicators or parameters calculated based on this average price (such as Delta decay and other related calculations) will also be adjusted accordingly. OKX reserves the right to make further adjustments to the price calculation methods with prior notice.