Question: Can you recommend a scalable and secure API for embedding video calls into my app?

For a scalable and secure API for embedding video calls into your app, Whereby is a good choice. It offers customizable video calling with features like pre-built UI, support for Telehealth and Digital Mental Health standards, and easy onboarding. With scalable infrastructure and reliable reliability, Whereby helps increase user engagement and trust across various industries.

Another good option is ZEGOCLOUD, which offers APIs and SDKs for adding real-time voice, video, and chat features to mobile and web apps. It supports multiple programming languages and frameworks, so you can integrate it in a variety of ways. ZEGOCLOUD is designed for high availability and low latency, so it's good for demanding apps.

Tencent RTC also offers a full platform for real-time communication, with video, voice calls and chat abilities. It works on a broad range of platforms and offers live streaming and conference SDKs. With a focus on stability and scalability, Tencent RTC is good for apps that need high reliability and low latency.

If you're looking for a high-end, secure option, Daily is worth a look. It offers enterprise-grade WebRTC features with high-definition recording and streaming, and supports up to 100,000 simultaneous participants. Daily also has strong security with end-to-end encryption and HIPAA compliance, so it's good for telehealth and live events.