Using Doni is absolutely free. At “Cash Out” for an Event, we charge a small fee of 3.5% of the total amount collected. This helps pay the providers that transmit money for us and allows us to “keep the lights on” at Doni. As an example, if the Doni amount you collected came to a total of $100, then the costs of transferring to a bank account are $3.50, so ultimately, $96.50 is actually transferred to you.