796 is the first futures exchange to ever offer > 20:1 leverage! This is even more than the top Chinese exchanges.
The way it works is simple
1. Choose 2% initial margin
2. Place up to 50 btc buy/sell order on 1 btc margin - After your order is filled every $1 increase/decrease in bitcoin value earns $50 worth of btc (subject to 0.03% transaction fee)
Since all transaction are completed in BTC there is no need to interact with fiat.
Warning - With high leverage comes high risk while rewards can be great so can losses