[thatthatis]

I think amazon payments has special terms for this kind of thing

[plusbryan]

Yes they do (this was news to me). For Transactions < $10:

1.5% + $0.01 for Amazon Payments balance transfers

2.0% + $0.05 for bank account debits

5.0% + $0.05 for credit card

They also appear to support payment aggregation, which is another method of making micropayments via credit card profitable.

https://payments.amazon.com/help/Amazon-Flexible-Payments-Se...