E2B A Verified
Infrastructure company · Coding
- Domains
- Coding Computer Use
- On X
- @e2b ↗
- Funding
- $32.5M raised · Pioneer · rounds and investors
- Tier
- A why
- Snapshot
What E2B does
E2B sells isolated Firecracker microVM sandboxes for AI agents, offered as a hosted cloud API or deployed in the customer's own cloud.
- Sells
- Infrastructure
- Based in
- San Francisco, USA
- Team
- 11-50
- Website
- e2b.dev ↗
What E2B sells
Read from E2B's own website, checked October 11, 2026: the line that puts it in each category.
Infrastructure
“E2B runs the isolated machine your agent works on. You ship the agent. We run the infrastructure. Our cloud or yours.”
e2b.dev/ ↗
Tier A
Scaling: 51 to 250 people, or $20M+ raised.
How much stands behind a tier: usage, who backs it, a confirmed line from its own site or paper, and a clear read on X. High with three of the four, medium with two, low otherwise.
- team 11-50
- raised $32M
- investors: Insight Partners, Decibel, Sunflower Capital
- went through Pioneer
- in curated RL directories (2 pts)
On X · well regarded, low buzz, from 12 posts about E2B in the last month
Users praise E2B's fast, reliable sandboxes and list it among top agent runtimes; one billing glitch complaint, engagement is small overall.
How we got to tier A
- Adoption: team 11-50; raised $32M; investors: Insight Partners, Decibel, Sunflower Capital; went through Pioneer. Tier A.
- On X: well regarded, low buzz. “Users praise E2B's fast, reliable sandboxes and list it among top agent runtimes; one billing glitch complaint, engagement is small overall.” No move.
- In curated RL directories: 2 points, a floor of none.
- Confirmed: a line from its own site or paper places it.
A clear view on X moves a tier one step up or down; most entries don't move. How tiers work.
E2B funding
- Raised
- $32.5Mstated total
- Latest round
- Series A $21M2025-07 · led by Insight Partners
- Accelerator
- Pioneer
Backed byPioneerDecibelInsight PartnersKaya VCSunflower Capital
Rounds
- Series A · $21M · 2025-07 · led by Insight Partners
Series A, $21M. Led by Insight Partners, with Decibel, Sunflower, and Kaya, plus angels including Docker's former CEO.
- Read: “Series A, $21M. Led by Insight Partners, with Decibel, Sunflower, and Kaya, plus angels including Docker's former CEO.”
- Found word for word on its own site: e2b.dev/about
- The quote states the amount and who led it
- Also named by 4 other pages read
- Seed · $11.5M · 2024-10 · led by Decibel
The same week, $11.5M seed led by Decibel.
- Read: “The same week, $11.5M seed led by Decibel.”
- Found word for word on its own site: e2b.dev/about
- The quote states the amount and who led it
- No other page or directory names it yet
- Pre-seed · 2023-09 · led by Kaya VC
Pre-seed. ~$2.5M led by Kaya VC, with angels including the founders of Supabase, Deepnote, and Better Stack.
- Read: “Pre-seed. ~$2.5M led by Kaya VC, with angels including the founders of Supabase, Deepnote, and Better Stack.”
- Found word for word on its own site: e2b.dev/about
- The quote names who led it; the amount isn't in it
- No other page or directory names it yet
Accelerator
- Pioneer
E2B (Insight, Decibel)
- Read: “E2B (Insight, Decibel)”
- Found word for word on the program's own site: pioneer.app
- Also named by 2 other pages read
Funds 4
- Decibel led a round
Named in the round quoted above.
- Insight Partners led a round
E2B has raised a $21M Series A funding round led by global software investor Insight Partners, with participation from Decibel, Sunflower Capital, and Kaya
- Read: “E2B has raised a $21M Series A funding round led by global software investor Insight Partners, with participation from Decibel, Sunflower Capital, and Kaya”
- Found word for word on its own site: e2b.dev/resources/series-a
- Also named by 5 other pages read and a curated directory
- Kaya VC led a round
Named in the round quoted above.
- Sunflower Capital
with participation from Decibel, Sunflower Capital, and Kaya
- Read: “with participation from Decibel, Sunflower Capital, and Kaya”
- Found word for word on its own site: e2b.dev/resources/series-a
- Also named by 4 other pages read and a curated directory
Angels 1
- Scott Johnston
along with prominent angels such as Docker's former CEO Scott Johnston
- Read: “along with prominent angels such as Docker's former CEO Scott Johnston”
- Found word for word on its own site: e2b.dev/resources/series-a
- Also named by 4 other pages read and a curated directory
Every figure is quoted from its own site, its accelerator or a funding announcement; a round's amount and lead appear only when its quote states them. Startup databases are never used as evidence. Checked 2026-10-11. How funding is checked.
Training methods
Methods E2B uses, offers or builds for, with public evidence: its own website says so, or two independent sites do.
- RLVR Reinforcement Learning with Verifiable Rewards On its own website
“A key part of that pipeline involves reinforcement learning with verifiable rewards , where a large language model (LLM) is trained to solve problems that can be checked for correctness against ground-truth answers. For example, given a simple math problem like “What is 1+1?”, the LLM receives a binary…”
e2b.dev - GRPO Group Relative Policy Optimization On its own website
“…umbing data generation through training so that we have visibility into how each task and its provenance actually influences the models we train. On the infrastructure side, running RL with a policy gradient method like GRPO or CISPO means orchestrating thousands of concurrent rollouts at once."”
e2b.dev
Where E2B sits
Its domain on the map, live. Hover a logo for its name; click to open it. Open it on the full map
Latest from E2B on X
@e2b ↗Next: browse all environments. Entry from the RL Research daily scrape of public sources, 2026-11-05 snapshot.