For non-recurring tiny payments I use PayPal for Digital Goods* for one of my side projects. It works about as well as paypal in general - but it is oddly hosted on even slower servers. It’s 5.5% + $0.05, so you don’t want to use it on anything costing more than say 5$.
If your customers are likely to be repeat customers, Amazons FPS Aggregated Payments* make some sense.
If your customers are likely to be repeat customers, Amazons FPS Aggregated Payments* make some sense.
* https://cms.paypal.com/c2/cgi-bin/?cmd=_render-content&c...
* https://payments.amazon.com/sdui/sdui/business?sn=devfps/agg...