In europe it's more like $0.35 on a $100 transaction for standard personal Mastercards and Visa due to regulation, the rest goes to the issuing bank to cover their costs and card rewards, and to your merchant bank to cover their costs and risk of chargeback. In US and Asia the interchange fees are much higher due to lack of regulation, thus it's not unusual for small business to pay a bundled rate of upwards of 4% if little credit history