Nothing. Seriously -- nothing. You don't pay us a dime. Our free version is free forever. There's no setup fee, no onboarding fee, no monthly fee and no per-transaction fee. When you get paid your rebate, we keep a small slice of that money to cover our operating costs, but that's coming from the banks to us, so you don't pay us anything.
For the paid tiers, the monthly fee comes from your rebate. If you sign up for a paid tier and don't earn a large enough rebate to cover the monthly cost, we cover the difference.