PatentsView
Patent
API is intended to explore and visualize trends/patterns across the US innovation landscape
No keyCORSHTTPS
Free Patent APIs
Free public APIs for patent, each one verified and kept up to date.
4 listed · 2 need no key · 1 work in the browser
USPTO
Patent
USA patent api services
No keyHTTPS
EPO
Patent
European patent search system api
OAuthHTTPS
TIPO
Patent
Taiwan patent search system api
API keyHTTPS
All 4 Patent APIs
Free Patent APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free patent APIs are there?
We track 4 in this category, of which 4 responded at our last check. 2 of them need no API key.
Which patent APIs work without an API key?
2 of the 4 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these patent APIs in a browser app?
1 entries in this category need no key and return CORS headers, which is the combination that lets you call them straight from client-side JavaScript. The rest need a server or a proxy in between.
Which is the fastest free patent API?
Of the keyless options that responded at our last check, PatentsView was quickest at a median 997 ms. Speed is only one factor — coverage and licensing usually matter more — but it is measured here rather than claimed.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 487 of 2,712 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.