I second this (although I'd just stick with JSON-RPC 1.0). REST has its uses case, but alas it's now so ubiquitous that developers don't even think about wether

I second this (although I'd just stick with JSON-RPC 1.0). REST has its uses case, but alas it's now so ubiquitous that developers don't even think about wether they should or should not use it. For machine to machine communication between heterogenous systems, the simplicity of JSON-RPC means one can implement a client easily in any language. Also creating method stubs is trivial. The payload is still human-readable should you use it from the browser and it's not prone to debates and interpretations around the meaning of HTTP verbs. All you have to know is what method you want to call and with what arguments... something that is natural to all developers, while they almost always get the endpoints/resources/verbs thing wrong.