Minimums are legal. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 permits businesses to impose a minimum purchase amount of up to $10 f

Minimums are legal. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 permits businesses to impose a minimum purchase amount of up to $10 for credit card use, but the minimum must be the same for all credit card issuers and payment card networks.