CEX.IO: Best Crypto Exchange CEX io is a cryptocurrency exchange that provides users with a convenient and fast platform for exchanging digital assets. The exchange supports spot trading for a wide range of cryptocurrencies, including popular options like Bitcoin, Ethereum, Litecoin, Tether, Cardano, Binance Coin, and Bitcoin Cash. Additionally, users can engage in CFD (Contract for Difference) trading. CEX .io also facilitates trading in fiat currencies such as the US dollar, euro, and British pound.