Basically it really depends on how much you put in and how you configure your robot. With Cryptohopper, you can try their platform for 7 days.
It does not depend on how much you put in,,, the bankroll size just changes the size of your lots but it does not change the percentage! Of course,,, there is a minimum you need or you will not even be able to execute the trades and $40 a month means you need 1% target a month so $4000 if that is your style. 10% of $400? Not realistic:)