There are several hundred different interchange fees and are usually made of two different components.  A percentage of sales amount and cents. For Example. Interchange for Visa Signature Preferred is 2.10% + 0.10.So, if you process a $10 Visa Signature preferred card you will pay $0.31 as interchange fee. $10 x 2.1% = $0.21 + $.10 = $0.31The rate above is just one of interchange rate and varies depending on various factors like Type of business : Defined by MCC code. Supermarket, retail, service station, non-profit etc. Processing method: Card present: These are transactions where the card was present and swiped using an electronic device. Usually at brick and mortar merchants.Card not present: These are transactions that are manually entered either by the merchant on an secure portal or by customer on an ecommerce site. Type of card Is it a credit or debit card, rewards or without rewards,personal, corporate or small business. Card brand Is it a Visa, MasterCard, Discover or American ExpressHonestly, all these different rates are confusing, but if you rather know them, they are listed below.Visa Interchange FeesMasterCard Interchange Fees