I agree with the previous comments about a project like this not being open source isn't a great idea. Hard to monetize on GETs and anyone who invests a lot of

I agree with the previous comments about a project like this not being open source isn't a great idea. Hard to monetize on GETs and anyone who invests a lot of time developing to the url's API will have to redo their app when you deprecate your service, as google did with the chart API. Still, having it as a hosted service doing image charts can be great, you just need to give folks a backup plan.