I was reading about your exchange platform and ran into the part where traders can give kind of loans to each other, so I was interested is there some kind of minimal or maximal limit on how much can one trader lend from another?
Bitto is not giving loans, users are. So as long as it suits both users and they have at least some crypto to back up their deal, it will be fine. As for daily interest - again that's with the users to decide. If someone is desperate enough to borrow money for 18% daily interest, he will.