Alter

We've seen a surge in agent-heavy deployments, and traditional identity providers struggle with the unique attribution and credential lifecycle needs of AI agents. Alter Vault steps into that gap neatly. We'd reach for it when building a multi-agent system that needs to act on behalf of end users — think a scheduling agent that reads Google Calendar and sends Slack messages. The identity chain (org → user → agent) gives you compliance-ready audit trails without building custom middleware. Where it bites: the per-call pricing adds up fast. At $0.50 per 1K overage, 10M calls would run $4,500 on top of the base plan. For high-volume scenarios, that might push you toward a fixed-price enterprise deal. Compared to alternatives like WorkOS or building on AWS Secrets Manager, Alter saves weeks of integration work but locks you into its proxy architecture — every API call passes through their servers, adding around 100ms latency. In practice, that's fine for async tasks like updating a CRM but not for real-time user-facing responses. Also, the free tier's 30-day audit log retention may be tight for compliance; the paid tiers offer unlimited. Bottom line: a polished auth middleware for agent stacks that's worth the cost if you value attribution and rapid integration over raw speed.