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.
No programmatic check, opens the archive’s own search.
Why it’s useful & how it works
BASE (Bielefeld Academic Search Engine) is one of the largest academic search engines in the world, built by Bielefeld University from content harvested via the OAI-PMH protocol from thousands of repositories and data providers. You search across this enormous corpus on base-search.net using keyword, author, subject, or date filters. Because its programmatic interface is restricted to pre-registered institutions, Echo links you directly to the BASE search page so you can run your query there.
What’s inside
More than 400 million documents from over 12,000 content providers, covering institutional repositories, digital libraries, and open-access journals across all disciplines and languages.
API access
An API key is required (usually free); see the endpoints above for where to get one.
What we measured
Our own probes, not the archive’s own claims. Re-run periodically; every reading below is dated.
Reachability
- Direct request
- Responded HTTP 200 171 ms
- Through a datacenter proxy
- Responded HTTP 200 1.5 s
- API, direct
- Blocked HTTP 403 80 ms
- API, through a proxy
- Blocked HTTP 403 776 ms
Reachability measured 2026-08-22.
Access
May be geo- or IP-blocked from some networks.