The archive · Developer & Business Tools · Product decision · 2023–2026
E2B bets agents need their own cloud: $32M raised, 88% of Fortune 100 signed up
Czech duo open-sourced sandboxed cloud computers for AI agents, raised $32M, and claim 88% of the Fortune 100 signed up.
E2B (FoundryLabs Inc.)
What the business is
Open-source cloud runtime that gives AI agents secure, isolated sandboxed environments — with browser, filesystem and compute — to execute code and use real tools.
Starting capital：$32M total by July 2025: $11.5M seed led by Decibel Partners (Oct 2024) and $21M Series A led by Insight Partners (Jul 2025).
How it started
Czech childhood friends Vasek Mlejnsky and Tomas Valenta built developer tools together for years, including Devbook; they pivoted to E2B in early 2023 and released the open-source sandbox runtime in March 2023, betting agents needed cloud infrastructure designed for them rather than for humans.
What happened
E2B's repo hit Python #1 on GitHub Trending in May 2023 and grew to 13.6k stars by Sep 2026. Sandbox launches scaled from 20,000 in April 2024 to 2 million in September 2024, then past 6 million cumulative since January 2024. Customers include Hugging Face, LMArena, Perplexity, Manus, Groq, Genspark and Lindy. Decibel led a $11.5M seed in Oct 2024; Insight Partners led a $21M Series A in Jul 2025, bringing total funding to $32M, with the company claiming 88% of the Fortune 100 signed up.
How it ended up
Still private and scaling as of 2026-09-01: E2B is building a standardized 'agent cloud' with secrets vault, observability, shared context and fleet orchestration, aiming to make its open-source sandbox protocol the universal runtime for AI agents.
Background
E2B is open-source cloud infrastructure that gives AI agents secure, isolated sandboxed computers — with a browser, filesystem and compute — to execute code and use tools. Czech childhood friends Vasek Mlejnsky and Tomas Valenta founded the company in 2023 and released the runtime in March 2023 after pivoting from their earlier devtool product Devbook.
The bet was that AI agents needed cloud infrastructure designed for them, not retrofitted human workflows: every agent gets an instant-on, sandboxed cloud machine. The open-source project hit Python #1 on GitHub Trending in May 2023, and sandbox launches scaled from 20,000 in April 2024 to 2 million in September 2024; customers include Hugging Face, LMArena, Perplexity, Manus and Groq.
Capital followed the traction: a $11.5M seed led by Decibel in October 2024, then a $21M Series A led by Insight Partners in July 2025 for $32M total, when E2B claimed 88% of the Fortune 100 had signed up and hundreds of millions of sandboxes had launched. The company is still private and scaling, positioning its open-source sandbox protocol as the default runtime for agentic software.
What has to be true
- The founders bet on infrastructure beneath the wave, not another agent product, so they rode every customer's agent as it shipped.
- Open source removed trust barriers: enterprises could inspect and self-host the sandbox before paying.
- Traction compounded visibly: 20k to 2M monthly sandboxes in five months made the enterprise claims credible to investors.
- Sandboxes with browser, files and compute covered agent needs that plain model APIs never could, so the wedge stayed defensible.
What can be applied
Bet on the missing layer, not the app: as agents arrived faster than infrastructure for them, E2B built the runtime beneath every agent instead of another agent product.
Aftermath
As of 2026-09-01, E2B is scaling engineering and go-to-market from San Francisco with $32M raised. Its open-source sandbox runtime is used by Hugging Face, LMArena, Groq, Perplexity, Genspark, Lindy and Manus, and the company reports hundreds of millions of sandboxes launched since October 2024, with 13.6k GitHub stars. The roadmap is a standardized agent-cloud layer — secrets vault, sandbox observability, shared context and single-console fleet orchestration — deployable on AWS, Azure, GCP, Kubernetes, Cloudflare or a company's own VPC.
Sources
- We Raised $21M to Give Fortune 100 Cloud for AI Agents
- E2B shares its vision of sandboxed, cloud environments for every AI agent after raising $21M in funding
- Czech Startup E2B Secures $11.5M to Develop Cloud Infrastructure for AI Agents
- E2B: The AI Agents Cloud
- e2b-dev/E2B star history
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