Patent — entry 001 of 3
EPO
The European Patent Office's Open Patent Services (OPS) exposes bibliographic, legal-status, full-text, and image data drawn from Espacenet and the European Patent Register through a RESTful, XML-based interface secured with OAuth2 client-credentials. Non-paying registered users get up to 4 GB of data per week for free, with a EUR 2,800 annual subscription available for higher volumes. A live request to the OPS host returned a fair-use-quota rejection while still echoing the requesting Origin in its CORS headers, confirming cross-origin access is genuinely enabled rather than merely documented.
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<a href="https://greatapis.com/api/epo/"><img src="https://greatapis.com/badge/epo.svg" alt="Scored 54 on greatapis.com"></a>Auth quickstart
- Register an app / run the OAuth flow to obtain a bearer token.
- Send it as an Authorization header
Authorization: Bearer <token>
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
3.5 GB of traffic volume per week on the free 'Non-paying' access tier; the paid 'Paying' tier offers unlimited traffic for EUR 2,800/year, per EPO's own OPS Fair Use Charter (quoted via docs.ip-tools.org's PatZilla setup guide)