Credit card swipe fees can range from less than 2 percent to as much as 5 percent, depending on the type of transaction, the merchant and the type of card. MasterCard’s most recent schedule of U.S. interchange fees covers 135 pages.
Some of the highest fees for merchants come with rewards cards, which have proven increasingly popular with consumers. Retailers who want to be part of Visa’s or MasterCard’s network can’t discriminate among cards; they must accept all of them
Retailers attack MasterCard, Visa model | StarTribune.com