science-articles
DOAJ
A directory of vetted open-access journals together with article-level metadata, covering roughly 21,000 journals and over 10 million articles. Searches run through a keyless interface over its openly licensed metadata, or you can browse the site directly. Use it to confirm a journal is genuinely open access or to find freely readable articles.
Academic papers API
Why it’s useful & how it works
No key for search (CC0 metadata). Works both ways, fast.
What’s inside
~21k journals, ~10M+ articles.
API access
https://doaj.org/api/v3/search/articles/ <query> ; .../journals/<query>
Access
Programmatic API access (a key may be required — see the API tag).