There are now a number of backend-as-a-service companies focused on mobile developers. We list 6 backend APIs that help with common mobile tasks, including the Cocoafish API, which was today acquired by Appcelerator. But it's a much bigger ecosystem, as shown in the infographic below.
Graphcool has extended its API via a new function: resolver. The resolver function extends the Grapcool API to 3rd party APIs and microservices. Graphcool pitches the function as one of its most powerful tools and expects it to simply integration with authentication services and third party APIs.