Bitmex
https://www.bitmex.com/BitMEX is the leading crypto derivatives exchange, providing professional crypto traders with a platform that caters to their needs with low latency, deep liquidity, and unmatched reliability.
Since our founding, no cryptocurrency has been lost through intrusion or hacking, allowing BitMEX users to trade safely in the knowledge that their funds are secure. So too that they have access to the products and tools they require to be profitable.