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| API | Description | Category | Date |
|---|---|---|---|
| AOL Open Auth | Authentication services | Security | 2007-08-16 |
| BeenVerified | Authentication services | Security | 2008-05-04 |
| buySAFE | E-commerce trust network | Security | 2006-11-01 |
| Defensio | Blog and social site spam prevention services | Security | 2008-09-14 |
| FraudLabs Credit Card Fraud Detection | Credit card verification service | Security | 2006-09-23 |
| FraudLabs MailBox Validator | Email address validation service | 2008-10-05 | |
| Google Client Authentication | Account authentication for installed applications | Security | 2006-11-05 |
| Google Safe Browsing | Security service to verify URLs | Security | 2007-06-29 |
| 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 |
| Microsoft HealthVault | Health-related data storage, security, and records | Medical | 2008-10-06 |
| Mollom | Blog and social site spam prevention services | Security | 2008-10-06 |
| Orange Authentication | Authentication service | Security | 2008-03-15 |
| PhishTank | Community site for tracking phishing | Security | 2006-11-01 |
| TokBox | Authentication services | Security | 2008-05-26 |
| TypeKey | Authentication Framework | Security | 2005-09-23 |
| WebPurify | Profanity filtering service | Tools | 2007-01-14 |
| Windows Live Data | Service for users to control data access | Security | 2007-05-01 |
| Windows Live ID Client SDK | Windows SDK for Windows Live sign-in authentication | Security | 2007-02-03 |
| Windows Live ID Web Authentication | Web based authentication service | Security | 2008-01-13 |