OKEX is futures trading exchange launched by OKCoin – its parent Chinese company that is a big player in cryptosphere. Besides futures trading, which is available only for BTC and LTC coins, this platform provides standard exchange services like many other competitors. You can buy/sell BTC, ETH and LTC against USD and CNY and there is also a large field for “token trading”. By token trading they mean any transaction done between cryptocurrencies that doesn’t involve fiat money. You can choose different trading pairs (more than 50) and can exchange one token to another anonymously. OKEX is popular in Asia and is not used a lot in western market.