Auth0

The platform provides authentication and authorization APIs that can be added to applications with minimal code, supporting a wide range of programming languages and frameworks through dozens of SDKs and quick‑start guides. It handles both human user logins and machine‑to‑machine interactions, offering features such as single sign‑on, token management, and fine‑grained access control that can be applied to AI agents, retrieval‑augmented generation pipelines, and internal tools. Designed for scalability, the service reports billions of authentications and attacks blocked each month while maintaining high availability, making it suitable for consumer‑facing products, B2B services, and enterprise environments that need secure identity management without building their own infrastructure.