Mastercard has a special “Convenience” rate program designed for a few specific types of merchants. You must be categorized as a quick-service food establishment, movie theater, taxicab/limousine, or convenience store to gain access to these rates. The intention of this program is to give lower rates to merchants who regularly process many small-ticket sales. These interchange rates have no “per-transaction” fees, which often add up quickly for low-average-ticket merchants!