It might seem like it, but it's actually not that different from a lot of REST APIs I know of. Most REST APIs return a status (in our case "this":"succeeded"), and some sort of wrapper for the actual data (in our case "with":{}). The only thing that might be redundant is the "by" property, but I think it's useful to have in cases where you want to make doubly sure that the API did what you thought it was going to do.