Ask HN: Is there any decent API to download a paper given its name?

I am developing a PDF viewer designed for reading research papers[1]. One very useful feature that I would like to add is the ability to directly download and open a paper just by clicking on its name in the PDF file. I have implemented a version of this using PyPaperBot [2] which is not bad, but it is not as fast as I would like it to be (it uses scihub which doesn&#x27;t have the best servers).<p>By parsing the html from google scholar, I wrote a python script that does this which was very fast and was working perfectly, however, after using it for a couple of minutes (maybe about 10-15 requests), I can no longer query google scholar using python requests (the returned html is a request for captcha). It appears that google disallows any programmatic use of google scholar (even though this was not spammy at all, the user has to manually click on a paper to send a request to google scholar).<p>Anyway I was wondering if there is any decent and free API to get the url of a paper given its name, I have found a couple of paid ones but they are way too expensive.<p>[1] https:&#x2F;&#x2F;sioyek.info<p>[2] https:&#x2F;&#x2F;github.com&#x2F;ahrm&#x2F;sioyek-python-extensions#-paper_downloader