Neat. I'll be interested to see how access restriction by user is handled? Obscure header key or URL? Something authenticated? I guess I will have to sign up to find out. It doesn't appear to be documented publicly.
There's three access levels: public (anyone can access), authenticated (anyone authenticated user in your organisation can access), and private (only selected users can access).
If an API requires authentication, then you'll need to login to see documentation or query it.
There's a little about it on https://sheetlabs.com/#/docs at the bottom, but you're right that the docs need to be fleshed out more fully and linked from the front page.
