Have you looked at AWS's DevPay? http://aws.amazon.com/devpay/ http://aws.amazon.com/devpay/ If your customers could provide you with an image of their server

Have you looked at AWS's DevPay? http://aws.amazon.com/devpay/ http://aws.amazon.com/devpay/ If your customers could provide you with an image of their server you could add that to your AWS account, and then bill them through DevPay for their usage. However, there might be some limitations with DevPay that I am not aware of, and it might not give you and your users the flexibility you need. On the plus side, it would keep everything self-contained - the user no longer needs to worry about paying you and Amazon. Also, I agree with elliottcarlson - anyone planning to use your site would be able to follow instructions to create/share their AWS keys. I like the site/idea, good luck.