There is only one reason to use an API — a developer has a use-case for it. Setting aside all of the security concerns, the existence of some API proxy is not useful in and of itself. Not only is it dead simple to set something like that up, by oneself, thus eliminating the security risks of relying on a third party, it’s just not going to gain traction if it doesn’t add something that makes it more useful than simply calling the endpoint API.

It’s cool you’re looking to try things, but perhaps coming up with a novel service would be a better use of time and effort.

I wish you luck.