Took 'em long enough.

Only downside is that Amazon has smaller fees for micropayments than other payment providers at 2% + $0.05 for debit cards and 5% + $0.05 for credit.

For comparison, Stripe has a rate of 2.9% + 30¢ -- but I'm sure KS will get a better deal due to the magnitude of their throughput.

Given that the average pledge size is $25 it won't that much of a problem, but any of those $1 pledges are close to halved from KS+Stripe fees before they get to the creator.