I not means that the minimum exchange value is $50, i means the minimum exchange fees is $5! I means my calculation to earn the best exchange is exchange with the amount of $50!

For example, if you exchanges $10 with GMX you will only get $5, not the 12% which is $8.80, cos the minimum exchanges fees is $5. So, to get the best of it, if you exchange $50 with 12% fees, you will get $44 (which is more than the minimum fees of $5)

Hope everyone here clear now!
the original fee is too high, now it is $5 , so i will get nonthing if i exchange $5 EVO to LR. it is hard to reach $50 in EVO. maybe in a year.