Auth0
Authentication & Authorization
Easy to implement, adaptable authentication and authorization platform
API keyCORSHTTPS
Free Authentication & Authorization APIs
Free public APIs for authentication & authorization, each one verified and kept up to date.
7 listed · 0 need no key · 4 work in the browser
Micro User Service
Authentication & Authorization
User management and authentication
API keyCORSHTTPS
MojoAuth
Authentication & Authorization
Secure and modern passwordless authentication platform
API keyCORSHTTPS
Warrant
Authentication & Authorization
APIs for authorization and access control
API keyCORSHTTPS
GetOTP
Authentication & Authorization
Implement OTP flow quickly
API keyHTTPS
SAWO Labs
Authentication & Authorization
Simplify login and improve user experience by integrating passwordless authentication in your app
API keyHTTPS
Stytch
Authentication & Authorization
User infrastructure for modern applications
API keyHTTPS
All 7 Authentication & Authorization APIs
Free Authentication & Authorization APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free authentication & authorization APIs are there?
We track 7 in this category, of which 6 responded at our last check. 0 of them need no API key.
Which authentication & authorization APIs work without an API key?
0 of the 7 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these authentication & authorization APIs in a browser app?
None of the entries in this category currently combine no-key access with CORS headers, so you will need a small server-side proxy to use them from browser JavaScript.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 487 of 2,712 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.