This speaks of "multiple translations." What I would really like are APIs to critical editions of the Greek New Testament, Septuagint, Hebrew Bible, Peshitta, Vulgate, etc. I'm not holding my breath; those are all under copyright, as I understand it, and they aren't cheap when added onto the major bible software packages.
I know of at least one public domain edition of the Byzantine majority text of the Greek NT:
I don't know anything about the non-Jewish sources, but Sefaria makes basically everything available via an API, no idea if it's free or not. A tonne of their code is available on GitHub as well.
I know of at least one public domain edition of the Byzantine majority text of the Greek NT:
https://newchristianbiblestudy.org/bible/greek-byzantine-200...
(not sure if that's the official page)
Edit: I suppose I could create my own API for that one!