I see firebase for Libgdx https://github.com/TomGrill/gdx-firebase but this is guide for android. Is firebase on MOE now?
It is not a guide, but an extension for libGDX, that (in theory) should provide a unified API for firebase across platforms. It is currently only partially implemented for Android as far as I can see. One could take the MOE bindings for firebase, and implement the wrapper in this project for ios-moe as well.