OKEx released an official announcement: OKEx has performed a temporary system upgrade at 16:40 on February 28, and the upgrade is expected to last 40 minutes. During the upgrade, delivery contracts (currency standard contracts, USDT contracts) and options contracts will be suspended. Market updates, order placement, order cancellation, and order modification functions will not be available. The scope of influence includes the WEB, APP, PC client, and API End (query and operation). During the upgrade, users can access OKEx normally, and normal transactions of other business lines are not affected.