The interchange rates (or interchange fees) represent the portion of payment settlement cost that is paid to the card issuing banks. These fees are established by the credit card companies. Interchange rates are openly disclosed on both VISA's and MasterCard's websites. No payment acquirer can settle payments for less than actual interchange. It is part of the unavoidable cost of processing card payments. There are literally hundreds of interchange rates and these vary by card type, cardholder rewards, transaction scenario, and merchant type. These links will take you to the published interchange rates:
Interchange fees actually have two cost components, a percentage rate and a fee per transaction. Interchange rates span from about 0.05% to 3.25% and the transaction fees range from zero to approximately $0.22 per transaction. Interchange fees are ultimately charged to the merchant for the privilege of accepting card payments. The examples below represent some of the more prevalent interchange rates: