**[Announcement from OKX Regarding Contract Mode Supporting Isolated Margin Selection for Collateral Currency]** To enhance trading stability, OKX will adjust the isolated margin trading in contract mode. After the adjustment, when conducting isolated margin trading, you can choose the base currency or quote currency as collateral for the trade based on your capital utilization needs and risk management preferences. After selecting the collateral currency, please promptly monitor and manage position risks. This adjustment will not affect your existing orders and positions. Please refer to the announcement for more details. **Adjustment Plan** This adjustment will be implemented in batches starting from October 9, 2025. **Scope of Application** - **Trading Type:** Margin Trading - **Margin Mode:** Isolated Margin Mode - **Account Mode:** Contract Mode **Impact of the Adjustment** This adjustment will not affect your existing orders and positions, so no additional action is required. **OKX Team** October 8, 2025