E2B
Secure cloud sandboxes for agents to execute code — isolated Firecracker microVMs with sub-200ms cold start.
About
E2B provides secure cloud sandboxes where AI agents can execute code without risk. Each sandbox is an isolated Firecracker microVM (the same technology behind AWS Lambda) that starts in under 200 milliseconds. Agents can run Python, JavaScript, Ruby, or C++ code, install packages, manipulate files, run terminal commands, and even use a virtual desktop — all in a disposable environment that can't affect anything outside itself.
The platform is used by 88% of Fortune 100 companies, with over 500 million sandboxes started and 2 million monthly downloads. E2B is LLM-agnostic, working with OpenAI, Anthropic, Mistral, Llama, and others, with framework integrations for LangChain, LlamaIndex, and Vercel AI SDK. The official MCP server lets any MCP-compatible agent spin up sandboxes and execute code directly.
E2B's free tier is unusually generous — a one-time $100 usage credit with no credit card required, supporting sessions up to 1 hour with 20 concurrent sandboxes. Paid plans start at $150/month for 24-hour sessions. Per-second billing means agents only pay while code is actually running.