PatentsView
Patent
API is intended to explore and visualize trends/patterns across the US innovation landscape
No keyCORSHTTPS
EPO
European patent search system api
Verified 4 days ago: 100% uptime
API key
OAuth flow
HTTPS
Supported
Browser calls
No, needs a proxy
Status
Live · 100/100
What our checks found
- Health score
- 100/100
- Reliability
- 100%
- Average latency
- 573ms
Last checked 2026-09-18. Measured independently, not self-reported by the provider.
How to call it
A starting template for EPO. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.
# Uses OAuth. Exchange your credentials for an access token first.
curl -s "https://developers.epo.org/ENDPOINT" \
-H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
-H "Accept: application/json"This API does not send CORS headers, so a browser will block a direct call from your front end. Call it from your server, or put a small proxy in front of it.
Where this listing comes from
Aggregated from 2 public sources (public-api-lists, public-apis), then normalised and checked by us. If something here is wrong, tell us and we will correct it.
Other Patent APIs
See all 4 →EPO — common questions
Answered from what our own scheduled checks found, not from the provider's marketing.
Is EPO free to use?
EPO is listed in our free catalogue, but it requires OAuth, so you will need to register before your first call. Providers frequently reserve higher limits and commercial use for paid plans.
Does EPO need an API key?
EPO uses OAuth rather than a simple key, so you register an application and complete an authorisation flow before making calls. That is more setup than a key, and it is why OAuth APIs are harder to try quickly.
Can I call EPO from browser JavaScript?
Not directly. EPO did not return CORS headers when we checked, so the browser will block your page from reading the response even though the request itself succeeds. Call it from a server, or put a small proxy in front of it.
Is EPO still working?
Yes, as of 2026-09-18. Our automated check reached EPO and recorded a 100% reliability score with a median response time of 573 ms. We re-check on a schedule, and this page updates with the result.
Is EPO available over HTTPS?
Yes. EPO serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.