Hopx - Secure Code Sandboxes

Run untrusted code safely in millisecond-startup sandboxes

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Updated Jul 2026 · Added Jun 2026

hopx.ai

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What is Hopx?

Hopx provides secure, isolated sandboxes for running untrusted code and AI agents safely. Built on Firecracker microVMs with ~100ms startup times, it enables execution of Python, JavaScript, Bash, and Go in hardware-isolated environments. Ideal for AI platforms, data processing teams, DevOps engineers, and researchers who need to run user-submitted scripts, validate AI-generated code, or execute long-running jobs without risking host infrastructure.

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Key Features of Hopx

Instant sandboxes (~100ms startup)
Multi-language execution (Python, JavaScript, Bash, Go)
Firecracker microVM isolation
Streaming output for real-time feedback
Filesystem operations (read, write, upload, download)
Shell command execution
Background execution for long-running processes
Desktop automation with VNC and screenshots
Public URLs for port exposure
System metrics monitoring (CPU, memory, disk)
WebSocket interactive terminal
MCP integration for AI agents
Pre-built and custom templates
Process management
Unlimited runtime duration

Who Should Use Hopx?

Run AI agents that write and execute code

Execute user-submitted scripts safely

Validate AI-generated code before deployment

Run long-running data processing jobs (ETL pipelines)

CI/CD testing in isolated environments

Background worker and scheduler execution

Desktop automation in the cloud

Host MCP servers

Code review automation

Webhook event processing

ML experiment execution with reproducibility

Load testing and benchmarking

Hopx: Pros & Cons

✓Pros

~100ms cold start times from prebuilt snapshots
Hardware-level security with Firecracker microVMs
No execution time limits - run jobs for hours, days, or weeks
Full state persistence for continuous execution
Zero host exposure and cross-contamination
Native MCP integration for AI agents
Production-ready with proven scale (10,000+ scripts/day examples)

Frequently Asked Questions about Hopx

Can Hopx sandboxes run Python, JavaScript, Go, and Bash all in the same environment?

Hopx supports Python, JavaScript, Bash, and Go, but each sandbox runs a single language execution at a time. You can switch languages between runs or use Bash as a wrapper to orchestrate multi-language workflows within the same sandbox instance.

How long can a job run in a Hopx sandbox before it times out?

Hopx imposes no execution time limits, so long-running jobs can execute for hours, days, or weeks without interruption. This makes it suitable for extended ETL pipelines, background workers, and ML experiments that require continuous operation.

Does Hopx sandbox startup time really stay under 100ms, or does it vary by language and workload?

Hopx achieves ~100ms startup times using prebuilt Firecracker microVM snapshots. The startup window is consistent across languages; what varies is the time to load and execute your actual code after the sandbox boots, which depends on your script's complexity and dependencies.

Can I expose a service running in a Hopx sandbox to the public internet?

Yes, Hopx generates public URLs that expose ports from your sandbox to the internet. This allows external services or webhooks to communicate with applications running inside the sandbox, though traffic flows through Hopx's routing layer.