to make any currency on the exchange, you need to pay a commission.
you can run dollars there, there seems to be less commission, and many different altcoins can be bought for them
For that polenix and bitrex are best option, you need to bear the just a few cents in the earning you are or at the time you buying alone with the coin you are using. Other than exchange that coin for multiple coin and all you have to use the gas fee from the amount you have. If you have eth in your wallet, it takes the fees amount from that.
Many altcoins can be buy bought don't go with every coin according to the one day growth alone. Even bitcoin also falls from the past two days. Keep invest on the right coin that is the right way.