We have it on beta version. Simply login (or register) to Binance then put this URL into browser: https://beta.binance.com/en/trade/BTC_USDT
You will land on page with option of markets and a button margin.
The margin is just x2 but this is not the catch.. The catch is..
This is not the first asian exchange that allows margin trading only for KYC users, yet normal trading for everyone. Same is with ie BiBox.
If you want to trade margin/perpetual without KYC then you can use only BitMex or ByBit for now.