I will guess everyone who makes a comment here will say "binance".
it is a fact and binance population is increasing, as well as bnb coins, everyone is hunting for it to get an IEO opportunity.
Non-US BitMEX trader here.
A few leverage trading sites that I know are not actively banning US IPs RIGHT NOW & SO FAR requires no KYC:
BaseFEX
Quedex
KuMEX
The issue with Binance isn't US authority requiring KYC. It is some more complicated legislation which essentially requires all American leverage traders to only trade on US-based, regulated, taxable exchanges. But they dont have eyes on every exchange out there.