Fermion

Built for running code in sandbox environments

Secure sandboxed environments with sub-200ms cold starts, shell access, and 50+ language support for AI agents and developer tools.

sandbox-example.js

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import { Sandbox } from "fermion-sdk";

// Create a new sandbox instance
const sandbox = await Sandbox.create({
  gitRepoUrl: "https://github.com/user/repo",
  timeoutMs: 120000,
});

console.log("Session ID:", sandbox.getSessionId());

// Execute commands with streaming output
await sandbox.runStreamingCommand({
  cmd: "npm",
  args: ["install", "express", "lodash"],
  onStdout: (stdout) => console.log(stdout),
  onClose: (exitCode) => console.log(`Exit: ${exitCode}`),
});

// File operations
await sandbox.setFile("/home/damner/code/app.js", code);
const content = await sandbox.getFile("/home/damner/code/app.js");

Sandboxed container environments with sub-200ms cold starts, shell access, and pay-per-minute billing. No setup required.

We've built everything you need for your AI-powered coding needs.

Shell Access

Install packages, configure services, or run any command you need in a secure isolated environment.

Sub-200ms Cold Starts

Instant execution with Firecracker VM cold starts under 200 milliseconds, no waiting, just immediate code execution.

Per-Minute Billing

Pay only for actual compute time, no idle costs, no wasted resources, transparent pricing that scales with your usage.

Coding Agents

Securely execute code, access the internet, start terminal commands. Perfect for AI agents that need to write and run code.

Desktop Environments

Desktop Sandbox to provide secure virtual computers in cloud for your LLM, full desktop environment.

Vibe Coding

Sandbox to code runtimes for AI-generated apps, support any language and framework with instant preview environments.

Running with full network access and I/O operations

AI Agent

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const express = require('express');
const app = express();

app.get('/api/users', async (req, res) => {
  const users = await db.getUsers();
  res.json(users);
});

app.listen(3000);

AI-generated code in isolated containers

Generate and execute code from AI agents safely. Full network access, filesystem operations, and shell commands—all sandboxed with hardware-level isolation.