Ask HN: Framework to bill customers for cloud compute costs?

I'm not clear whether this thing exists, but essentially, I have a useful algorithm for a specific niche market. I would like to implement it on a highly parallel cloud compute platform (think running a job on 1000+ nodes at once, possibly though not necessarily with mapreduce). And I would like to charge customers for using this algorithm.

Is there an existing framework that handles all the necessary billing - ideally with customers directly liable to the compute provider, to limit my own liability, with a percentage added for my own fees?

I appreciate on AWS you can release an EC2 image which people can use on their own instances while you charge an hourly licensing fee. Ideally I'd be looking for something easier on the customer, though.