science-articles
PubMed / PMC (NCBI E-utilities)
The US National Institutes of Health's index of biomedical literature, covering roughly 37 million citations plus about 10 million full-text articles in PubMed Central. You search the corpus through NCBI's E-utilities, which return results without an API key. It is the standard first stop for medical, clinical, and life-sciences literature.
Academic papers API
Why it’s useful & how it works
FINDING: works from the direct IP, datacenter proxies error/blocked. No key up to 3 req/s (free key -> 10/s). Route DIRECT, not via pool.
What’s inside
~37M citations; ~10M PMC full-text.
API access
https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=...&retmode=json
Access
Programmatic API access (a key may be required — see the API tag).