You can play this with margin @ http://bit.ly/2QjJ75v - I dont see these talked about but they have a good selection of margin pairs vs USDT - They have stringent KYC rules and don't allow Americans or Japanese - but they accept Crypto deposits so if you are from there a little bit of 'fraud' I am sure you can get around that. Hint - Tunnelbear - https://www.mailboxde.com/address-in-ger... - some Photoshop ; )
They are a little different, to long you need to loan USDT in the pair you want to play, for example if you play this you go to margin borrow - XRP then loan USDT and buy XRP.
To short you either buy the asset or loan it and sell it in margin. Lil weird and clumsy but good selection or pairs will be a money maker when the market turns .