Screenshot-as-a-Service

In need of setting up a screenshot-as-a-service on our Linux box. The service shall produce a PNG from a URL. We are likely to use PhantomJS unless you have a better, more authentic way to generate it. We like to have a service layer where we can call it remotely, similar to [login to view URL] or [login to view URL] We just need to have a REST endpoint and an authentic screenshot from a URL.