Auth and user accounts for AI agents
5 APIs compared on price, free tier, MCP support and real usage. Prices from the vendors' pricing pages, checked Oct 9, 2026.
| API | Free | Price | SDK downloads / wk | GitHub stars | MCP |
|---|---|---|---|---|---|
| Privy Embedded wallet infrastructure for authentication and transaction signing across blockchains. |
50K signatures and $1M transaction volume per month | Free plan · paid from $299/mo | — | — | |
| Clerk Authentication and user management API for sign-up, sign-in, and user profiles. |
Up to 50,000 MRU (monthly retained users) per app | Free plan · paid from $25/mo | — | — | |
| Web3Auth Authentication and wallet management for Web3 applications using blockchain logins. |
1,000 Monthly Active Wallets (MAWs) | Free plan · paid from $69/mo | — | — | |
| Magic Authentication and wallet infrastructure for web3 applications. |
1,000 Monthly Active Wallets + 50,000... | Free plan · paid from $99/mo | — | — | |
| Auth0 Authentication and authorization platform for user identity and access management. |
Up to 25,000 monthly active users | Free plan · paid from $35/mo | — | — |
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