Costs of various payment plaftorms
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As of Dec, 2011. 

Visa rates go down for reliable or "small ticket" vendors; eg 1.65% + $0.04 per
swipe. See http://usa.visa.com/download/merchants/Interchange_Rate_Sheets.pdf

 - Visa Standard Credit Fee: 2.70% + $0.10 per swipe
 - Visa Standard Debit Fee: 1.90% + $0.25 per swipe
 - Visa Utility Payment (Credit or Debit): $0.75
 - PayPay transfer, credit or debit (p2p): 2.9% + $0.30
 - PayPay transfer, bank (p2p): Free
 - PayPal merchant (eg, ebay): 2.9% + $0.30
 - PayPal discounted merchant: 2.2%
 - Stripe: 2.9% + $0.30
 - Dwolla under $10: free
 - Dwolla over $10: $0.25
 - Square credit cards: 2.75%