Treco

It is easy, fast and free to exchange Cryptocurrency (btc, eth, BitcoinABC, ripple etc.) with Treco.
Treco also has XTR, Treco Exchange Token. When you make a transaction, XTR is given by Treco as a commission.
It has automining feature which means to do the best deal by having the bot automatically without the user performing the trade.
It has referral system,when your friend signs up via your link, your friend will get 1000 XTR and you will get 1000 XTR. (with 90 days lockup)