Announcement by Ouyi on Adjusting the Statistical Method for VIP Trading Volume of Options Dear Ouyi user: Starting from May 21, 2026, the 30 day trading volume of options used for VIP rating will be calculated using effective nominal value. This adjustment only involves the option category, and other categories are not affected. Please note: Ouyi reserves the right to modify or postpone the effective date of the above changes at its own discretion. Please always refer to the Ouyi rate page in your region for the latest information. If the effective date changes, no further notice will be given. The trading volume of options is calculated using effective nominal value. For each transaction, the effective nominal value=Min (nominal value, | commission |/| commission rate |). The handling fee is the actual fee charged (including the 7% option premium effect), and the handling fee rate is the corresponding maker or taker rate for the user. If the handling fee exceeds 7% of the option premium, | handling fee |/| handling fee rate |=Notional, the trading volume remains unchanged. Only when the transaction fee triggers the cap, will the trading volume be correspondingly reduced. Currency based options: The transaction fee is based on the underlying asset (such as BTC) and needs to be multiplied by the index price at the time of transaction to convert to USD. The handling fee is equal to the settlement asset valuation handling fee multiplied by the index price. USD Standard Options: The transaction fee has been denominated in USD and no additional conversion is required. The handling fee equals the settlement handling fee. The platform settles daily at 0:00 (UTC+8) and calculates the option trading volume for the past 30 days. The calculation method for trading volume of other categories (spot, contract, perpetual, spread) remains unchanged. Assuming the contract multiplier of the BTCUSD option is 0.01, the face value is 1 BTC, and your take rate is 0.03%, buy 100 call option contracts (with a nominal value of 1 BTC). If the option premium is 0.05 BTC and the handling fee is 0.03% x 0.01 x 1 x 100=0.0003 BTC, then the minimum value between 7% x 0.05 x 0.01 x 1 x 100=0.0035 BTC (without triggering the cap) is 0.0003 BTC. Effective nominal value=Min (1, 0.0003/0.03%)=1 BTC, with no change in trading volume. If the option premium is 0.001 BTC, the handling fee is 0.0003 BTC, and 7% x 0.001 x 0.01 x 1 x 100=the minimum value among 0.00007 BTC, which is 0.00007 BTC (trigger cap). Effective nominal value=Min (1, 0.00007/0.03%)=0.2333 BTC, adjusted trading volume to 0.2333 BTC. Users trading options are requested to adjust their trading strategies in a timely manner according to the adjusted rules. If you have any questions about the above changes, please visit www.okx.com/helpcenter or contact the Ouyi customer support team through the in app customer service function. Thank you for your continued support. Ouyi team