I've heard a lot about Bitmex. A lot of people trade there are with leverage. It's very dangerous but I want to try it too. You should use stop losses and trade a small part of deposit.
It will be good if you exert some effort to research about bitmex before you use it, not just because you heard over it means you should easily try it.
On the other hand, US residents are prohibited in using bitmex and don't dare to use VPN as bitmex team can still caught you.
Bitmex is not a "normal" crypto exchange where you can trade a coin with another coin. It's a derivative exchange, you can only trade BTC and several altcoins futures contracts in Bitmex. All contracts are bought and sold in Bitcoin, that's why you don't see other deposit/withdraw option other than Bitcoin. You can't deposit/withdraw USD, everything is in BTC.
Here's the list of
traditional futures use in bitmex
btc, bch, eos, ltc, ada, xrp, eth