I don't think there is a public api available for this sorta stuff. You could use DNSimple API for domain lookup & registration but it's a paid service.
Why would you wanna get into hosted service? I believe currently you've a perfect model where you don't have to deal with logistics issues and you can just keep improving the SDK.
Having a service would make it possible to set up plugins for no-code solutions, it's very difficult to do this with the SDK as that requires code to be written. The less friction to get started the better.
OBS is for streaming your screen, for recording checkout ScreenFlow.
Thank you for taking time to respond the question. You shared some very good pointers on how I should be looking at my products rather than going in spirals of due diligence.
Looking from the lens of v0.1 is far more achievable instead of aiming of v1.
I'm making your this answer my manifesto of launching products going forward. Cheers!
I use splitbee.io for my personal site, it works nicely.