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Patent — entry 001 of 4

EPO

Verified Jul 2026

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.

patentsgovernmenteuropeoauthxml
Visit developers.epo.org ↗More Patent
AuthenticationOAuthRequires an OAuth flow; expect app registration.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingFreemiumA usable free tier exists, with paid plans for more volume.
FormatsXMLResponses can be requested as XML.

GreatAPIs Score

Score54out of 100
Authentication8/25OAuth flow required
Pricing17/20Freemium tier available
Docs0/20No docs or spec available
Formats9/15Single response format
Freshness20/20Verified within 6 months

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Scored 54 on greatapis.com
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Auth quickstart

  1. Register an app / run the OAuth flow to obtain a bearer token.
  2. Send it as an Authorization headerAuthorization: Bearer <token>
Stored keyNo key stored

Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.

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EPO vs PatentsView

PatentsView, the NBER/USPTO-backed tool for mining trends across the US patent landscape, folded into the USPTO's unified Open Data Portal (ODP) in March 2026, retiring the standalone patentsview.org domain and its old keyless endpoint. Access now runs through ODP's api.uspto.gov gateway, which requires a free API key tied to a USPTO.gov account and returns JSON over HTTPS with CORS enabled. Every patentsview.org URL, including the one previously on file here, now 301-redirects to USPTO's own transition guide rather than serving data directly.

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EPO vs TIPO

EPO supports CORS, while TIPO doesn't — pick EPO for direct browser calls.

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EPO vs USPTO

USPTO's patent data and query APIs now live under the agency's Open Data Portal (ODP) at data.uspto.gov, a single platform that folded in what used to be the Patent Examination Data System, Bulk Data Storage System, and several Developer Hub services. Every ODP endpoint sits behind api.uspto.gov, requires a free API key tied to a USPTO.gov account, and returns JSON with CORS enabled — confirmed live via an Origin-header probe that got back access-control-allow-origin: * on both the request and its OPTIONS preflight. The stored learning-and-resources page itself has been renamed to a 'Data and statistics' hub that links out to the ODP.

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