Accept Credit Cards through Iphone (Squareup)

This seems pretty cool. 

https://squareup.com/

Simple pricing

After your first 30 days of using Square, you pay only 2.75% per swipe. That’s it.
No monthly fees, hidden costs, or additional credit card fees. Just swipe and with simple multiplication you’ll know exactly how much will be in your bank account.
Payments, simplified.
Do businesses know what they pay for credit card processing?

If you enter credit card numbers manually, Square costs 3.5% + 15¢ per transaction.