11 Security & Auth APIs with verified auth, pricing and rate limits. 11 offer a free tier; 6 document an MCP server. Every field carries the source URL that states it.
| API | Category | Auth | Pricing | MCP | Free | Confidence |
|---|---|---|---|---|---|---|
| GitGuardian API gitguardian.com | Security & Auth | api_key | freemium | ● | ● | high |
| Pulsedive pulsedive.com | Security & Auth | api_key | freemium | — | ● | medium |
| Fingerprint (FingerprintJS Pro) fingerprintjs.com | Security & Auth | api_key | freemium | ● | ● | medium |
| IPLogs iplogs.com | Security & Auth | none | free | — | ● | high |
| PhishStats phishstats.info | Security & Auth | api_key | freemium | — | ● | medium |
| Auth0 auth0.com | Security & Auth | oauth2 | freemium | ● | ● | medium |
| GreyNoise greynoise.io | Security & Auth | api_key | freemium | ● | ● | medium |
| MojoAuth mojoauth.com | Security & Auth | api_key | freemium | — | ● | medium |
| Privacy.com privacy.com | Security & Auth | — | freemium | ● | ● | low |
| FullHunt fullhunt.io | Security & Auth | — | freemium | ● | ● | low |
| Greip API greip.io | Security & Auth | api_key | freemium | — | ● | medium |