Ask HN: Best solution to accept micropayments

I was wondering what the best solution for accepting very small payments (lets say 1 dollar). I've looked at some of the bigger names and the results have been less than ideal, with the best possibility leaving me with only 78 cents of the original dollar.

Examples for 1 dollar - Wepay: 3.5% with 50 cent minimum = 50 cents Mpayy: 2% + 20 cents = 22 cents Google Checkout: 2.9% + $0.30 = 32.9 cents Paypal: 2.9% + $0.30 = 32.9 cents

Is there anything out there that offers a more optimal fee structure for 1 dollar payments? Can someone explain to me what the "behind the scenes" fees would look like for charging a buck on a visa or mastercard?