| API | Description | Category | Date |
|---|---|---|---|
| Aadhaar UIDAI Authentication | Online authentication for Indian citizens | Government | 2011-06-28 |
| AOL Open Auth | Authentication services | Security | 2007-08-16 |
| AT&T Notary Management | Digital signature service | Security | 2012-01-13 |
| Atlassian Crowd | Single Sign On service | Security | 2011-06-24 |
| Authy | Website and application authentication service | Security | 2012-08-08 |
| BeenVerified | Authentication services | Security | 2008-05-04 |
| BioID Web Services | Face and voice biometrics service | Security | 2012-08-02 |
| Confident Image-Based Authentication | Image-based authentication service | Security | 2012-06-08 |
| Duo REST | Two-factor authentication | Security | 2012-05-01 |
| Duo Verify | Web to mobile user verification | Security | 2012-05-01 |
| DuoFactor | Web authentication service | Security | 2011-09-09 |
| eduroam | European internet resource management service | Internet | 2012-06-13 |
| Enole | Mobile Authentication Service | Security | 2010-08-05 |
| FreeYourID | Online identity authentication services | Internet | 2008-08-16 |
| Gigya | Single Sign-In/Registration Service | Social | 2010-12-01 |
| Google Single SignOn | Authentication for Google Apps | Security | 2007-02-23 |
| Google Web Authentication | Account authentication proxy for web-based applications | Security | 2006-11-05 |
| HP Cloud Identity Service | Cloud identity management service | Security | 2012-04-17 |
| Janrain Engage | Social networking login service | Security | 2008-12-24 |
| MyPW Authentication | Authentication services | Security | 2008-12-29 |
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