science-articles
BASE (Bielefeld)
A Bielefeld University academic search engine indexing over 400 million documents harvested from more than 12,000 content providers. The web portal is openly browsable for searching across this material. Its programmatic interface is limited to pre-registered IP addresses, so in practice you use it through the website.
IP-blocked
Search this archive
No programmatic check — opens the archive’s own search.
Why it’s useful & how it works
API uses an IP-WHITELIST model (apply with use case; the registered IP only). Unusable from an arbitrary proxy pool. Portal browsable. Link-only for us.
What’s inside
~400M+ documents.
API access
An API key is required — usually free; see the endpoints above for where to get one.
Access
May be geo- or IP-blocked from some networks.