I have test the Exchange BitMax.io
https://bitmax.io/#/register?inviteCode=FN8UOAY2
BitMax.io is a multi-trading Platform, you can reach it 3-Ways.
Web-Browser, iPhone and Android App.
There is a good Balance-Overview in the Backoffice.
The Exchange looks very well and it is very easy to trade.
On Coingecko, the Exchange is on Rang 1, with 4.899.812.925 $ (21.03.2019)
The BitMax ER20 Token BTMX is a Payback Token and have a big potential.
The Price for one Token, is only 0.09USD, like the Binance Coin at the start.
Have a look on: https://bitmax.io/#/register?inviteCode=FN8UOAY2