Swell requires an initial minimum account balance of $50. They won’t penalize you if market performance causes your account to dip below $50, but if you choose to withdraw an amount that will take your account below the minimum, they will ask you to either skip the withdrawal or close your account instead.

If all you ever do is put in your first $50, your annual fees will be approximately  $0.37 ($50 x 0.0075= $0.37).