Is there any exchanges that allows to place market orders (buy at ask and sell at bid) without any fees? or crazy wide spread?
Try cobinhood, it's zero trading fee but the things is they're withdrawal fee is a little bit higher, but it's pretty good to use, so far.
IMO, trading fee shouldn't bother you since you're earning good and it doesn't kill you tho, instead always just look fir high trading volume.