Typically, if a business accepts cards, part of their agreement with the card-processing company is that they cannot charge a surcharge. Card transactions have

Typically, if a business accepts cards, part of their agreement with the card-processing company is that they cannot charge a surcharge. Card transactions have to be the same price (presented to the customer) as cash transactions. (I forget how gas stations get around this.) I do tend to see "card transactions under $X will have a Y¢ surcharge" handwritten signs in smaller businesses. I don't know if that's permitted or if MegaGloboCorp simply hasn't cared that the dive bar or taqueria isn't holding to their contract.