Is it possible to set default grades/post grades for assignments via API?

[jgrnst]

I have a number of assignments which are created automatically via MyLab, and posting each of them via the web interface, as well as setting default grades for them, is very tedious. Even if it wasn't, my preferred way of working with Canvas is via the API. Is there a call for posting grades for an assignment (that is, making them visible to students) and for setting default grades for an existing assingment?