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Not sure off the top of my head but it's possible that crossref DOI lookup has an API you can use for this.

https://openapc.github.io/general/openapc/2018/01/29/doi-rev...

I do use crossref for bibtex. It is not useful for getting a download link (as far as I know).

Ah sorry. I guess I don't understand what you are looking for.

Once you have a DOI (from crossref or otherwise) you can get a legal download link simply by putting 'https://doi.org/' in front of it (though it will often go to a summary/login page rather than the PDF) and a SciHub PDF link by prepending 'https://sci-hub.ru/'. Or am I missing something?

I already use scihub (I explained in the post). However, it is much much slower than google scholar.

Then 'https://scholar.google.com/scholar?q=<doi>', where <doi> is URL escaped?

It seems to me that Crossref can give you the DOI, and once you've got that then getting to article text is pretty trivial. I must be missing something.

Google blocks you once you use python to request it multiple times (I explained in the post).

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