Will api sub domain return S-Expressions with data like most API send JSON?

What kind of data you want to expose with the API?

It would be nice if the api use CORS[1] headers, so you can use the api from
Browser's JavaScript. I think it would be nice example for my Scheme
interpreter, how easy is to interact with S-Expr API. There will be not much
of use of the API in browser if it's restricted and you need to use
server proxy script just to use it.

[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS