Koyeb

Isolation workspace : no
Isolation runtime : MicroVM

Koyeb provides high-performance, serverless microVMs on bare-metal for AI agents and untrusted code. Features include 250ms cold starts, auto-scaling, and total isolation. Perfect for secure workflows, prototyping, and testing globally without managing local infrastructure.

koyeb.com/blog/koyeb-sandboxes-fast-scalable-fully-isolated-environments-for-ai-agents