E2B, the leading provider of open-source cloud infrastructure specifically designed for AI agents, has raised a $21 million Series A funding round led by global software investor Insight Partners, with participation from Decibel, Sunflower Capital, and Kaya, along with prominent angels such as Docker's former CEO Scott Johnston. The investment will enable E2B to accelerate the expansion of its cloud infrastructure offerings, enhance its open-source interoperability with other infrastructure providers, and scale its enterprise-focused engineering and go-to-market teams globally.