Ouyi will cease trading in USDC on the USDT/USD spot trading pair To optimize the experience of spot trading products, Ouyi will no longer support trading in USDC for new orders in USDT/USD Ⓢ trading pairs, but will continue to support trading in USDG or RLUSD. For more information on the unified order book, please refer to the product documentation. Schedule: May 20, 2026 at 17:00 (UTC+8) - USDT/USD Ⓢ will no longer support USDC as a trading currency. Impact on you spot orders: For new orders, you will not be able to submit new orders for trading in USDC on USDT/USD Ⓢ. USDT/USD Ⓢ will continue to support new orders traded directly in USDG or RLUSD. All pending orders submitted before the effective date (priced in USDC, USDG, and RLUSD) will remain valid and will not be forcibly cancelled by the system. You can still modify and cancel trading strategy orders - take profit stop loss, move take profit stop loss, and plan orders: Strategy orders that have not been triggered and use USDC as the trading currency will be cancelled by the system at the effective time. Strategy orders using USDG and RLUSD as trading currencies are not affected. Strategic trading: Running strategies using USDC will be revoked by the system at the effective time, and their associated pending orders will also be revoked. Continue to operate normally using USDG or RLUSD strategies. New strategies can still choose USDG and RLUSD as trading currencies. Not affected: USDT/USD Ⓢ can still be used for spot trading with TradeWith USDG or RLUSD. Your USDT, USDC, USDG, and RLUSD balances are not affected. If alternative trading pairs need to continue trading between USDT and USDC, please use the following independent spot trading pairs: Trading Pair Product IDUSDC/USDTUSDC-USDT. Please check your current strategy order and trading strategy before the effective time of USDT. If it is set to use USDC as the trading currency on USDT/USD Ⓢ, please migrate it to USDG and RLUSD, or to the above-mentioned independent trading pairs, to avoid accidental revocation when it takes effect. If you need assistance, please contact OKX customer service. OKX reserves the right to modify, revise, or withdraw this announcement at any time without prior notice. Thank you for your continuous support of Ouyi. Ouyi Team May 20, 2026