Best Patent APIs in 2026
The top 4 of 4 free Patent APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. USPTO API takes the top spot.
Last tested Oct 24, 2026 · Rankings update daily
Ranking
- 1
USPTO API
Online · 1300 msExplore data and statistics on patents and trademarks.
- No API key needed
- HTTPS
No authHTTPSCORS ? - 2
PatentsView API
Online · 2284 msAPI is intended to explore and visualize trends/patterns across the US innovation landscape.
- No API key needed
- HTTPS
No authHTTPSCORS ? - 3
- 4
Patent APIs compared
| API | API key | HTTPS | CORS | Uptime | Response | Rating |
|---|---|---|---|---|---|---|
| No | Yes | Unknown | Up | 1300 ms | Not rated | |
| No | Yes | Unknown | Up | 2284 ms | Not rated | |
| OAuth | Yes | Unknown | Up | 246 ms | Not rated | |
| Required | Yes | Unknown | Up | 1835 ms | Not rated |
More Patent APIs
Best Patent API FAQ
What is the best free Patent API in 2026?
Based on access, reliability and developer ratings, the top free Patent APIs right now are USPTO API, PatentsView API and EPO API. USPTO API ranks first. Rankings update daily from health checks of all 4 Patent APIs in the directory.
What is the best Patent API without an API key?
USPTO API and PatentsView API need no API key, so you can call them without signing up. 2 of the 4 ranked Patent APIs are keyless.
How are these APIs ranked?
Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.