Just found out about CloudRail now, looks awesome!

1. Is Xamarin support on the radar at all? That would allow me to integrate apps on multiple device platforms and multiple services all with one library.

That's a pretty compelling case for the kind of work my company does.

2. Is there a one-time, fixed, pricing tier that you've considered (maybe including paid updates)? As a consultant in a larger firm, we will often build apps for a client and hand it off to them when it's done. Handing them a monthly bill isn't often an option, but engaging with them when APIs change and their APP will need to be updated is a fairly common/straightforward thing to do.