There are limits (it's still _revolutionary_ for an industry that loves to nickle & dime, though) Up to $400 per any single transaction and up to $250,000 in total transactions per year—or approximately $21,000 per month. Swiped transactions over these limits simply cost 2.75% per swipe. $21,000 * .0275 = $577.5 in fees. I would love to see more Square adoption. In Charleston, lots of cart vendors (hot dogs, popsicle…
In college, I financed a spring break trip with credit card points by buying US Savings bonds on a credit card. The US treasury quickly wised up and realized selling bonds without charging a credit card fee was stupid. Even the US treasury got caught up in the first internet craze.