CEX.IO offers security, high liquidity, and cross-platform trading. It has somewhat high fees, margin trading, almost 100% uptime, etc. It is headquartered in London, UK. It was affected by a small hack long back but has had no issues for a while. It has over 2 million accounts and a wide variety of cryptocurrencies for sale.CEX.io appears to have little no fees at first glance. They are able to do this by charging a premium on the Bitcoin price. When a user buys cryptocurrency on their exchange, they are paying more for the actual currency compared to the other exchanges prices. This doesn’t matter too much as it is basically the same thing as a service fee.