Patents APIs
Patent data here comes straight from the patent offices. USPTO covers US patent and trademark filings, examination status, PTAB decisions and ownership assignments, free with an API key. EPO Open Patent Services searches European and worldwide bibliographic, full-text and legal-status data, using OAuth. PatentsView, the older US source, is marked unavailable while it moves to USPTO's data portal.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
EPO Open Patent ServicesSearch European and worldwide patent bibliographic, full-text and legal-status data from the EPO. Data & Knowledge › Academic | Free | OAuth | XML | — | Live |
PatentsViewUS patent bibliographic and inventor data, formerly at api.patentsview.org, now moving to USPTO's data portal. Data & Knowledge › Academic | JSON | — | Deprecated | ||
USPTOUS patent and trademark filings, examination status, PTAB decisions, and ownership assignment records. Data & Knowledge › Open Government Data | Free | API key | JSON | Unlimited | Untested |
EPO Open Patent ServicesFreeLive
Search European and worldwide patent bibliographic, full-text and legal-status data from the EPO.
OAuth · XML
—
no machine-readable spec
PatentsViewDeprecated
US patent bibliographic and inventor data, formerly at api.patentsview.org, now moving to USPTO's data portal.
· JSON
—
no machine-readable spec
USPTOFreeUntested
US patent and trademark filings, examination status, PTAB decisions, and ownership assignment records.
API key · JSON
Unlimited
OpenAPI spec
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Choosing a Patents API
Is there a free Patents API?
Yes. USPTO and EPO Open Patent Services are free to use.
Which Patents APIs work without an API key?
All of them need a key or account. USPTO gives one out free when you sign up.
Which Patents APIs work with AI agents?
USPTO publishes an OpenAPI spec for generating clients and tools.
Broader: Academic APIs · Data & Knowledge APIs
More in Academic: Citations APIs