Interchange rates are established by MasterCard and Visa, and are generally paid by acquirers to card issuers on purchase transactions conducted on credit cards. Interchange rates are only one of many cost components included in a MDR, and are a necessary and efficient method by which the card associations maintain strong and vibrant payment networks.
The card associations periodically adjust interchange rates to reflect changes in the credit card marketplace. Setting interchange rates is a challenging proposition that involves an extremely delicate balance. Visa normally makes their changes in the fall of each year, and MasterCard in the spring. Accordingly, here is the most recent MasterCard rates and criteria effective as
of April 2010... click here