[venaoy]

Yes it is legal:

"Beginning January 27, 2013, merchants in the United States and U.S. Territories will be permitted to impose a surcharge on consumers when they use a credit card." http://usa.visa.com/personal/get-help/checkout-fees.jsp

[scotty79]

> Historically Visa has not permitted retailer surcharging, but allowing surcharging was a key provision required by merchants to settle long-standing litigation brought by a class of retailers in 2005.

It's good that governments still have a bigger stick they can use to beat some sense into corporations.