How fast does eryx start new sandboxes?

New sandboxes start in about 1–5 milliseconds.

What isolation does the sandbox provide?

The sandbox has no filesystem or network access unless you explicitly allow it, with limits on every run.

Can sandboxed code call functions from the host?

Yes, sandboxed code can await the functions you expose as callbacks.

Fact sheet · Developer Tools

eryx

WebAssembly sandbox for running untrusted Python safely

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Open-source sandbox running CPython 3.14 in WebAssembly. Embed from Python, JavaScript or Rust with async callbacks and tight security controls.

Overview

Screenshot of the eryx homepage — What eryx.run looks like

eryx is an open-source WebAssembly sandbox that runs full CPython 3.14 with the complete standard library. It can be embedded from Python, JavaScript or Rust, and lets sandboxed code await the functions you expose. The sandbox provides strict isolation with no filesystem or network access unless explicitly allowed, and starts new instances in about 1–5 milliseconds. It's designed for agents and works as an MCP server, allowing Claude, Cursor, VS Code and other tools to discover and use MCP tools inside the sandbox.

Feature facts

Full CPython 3.14 with standard library
Async callbacks from sandboxed code
No filesystem or network unless allowed
Fast startup in 1–5 milliseconds
Embed from Python, JavaScript or Rust
MCP server support
gRPC server deployment
Hosted execution over HTTP and WebSocket

Pricing

Pricing model: Open source

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eryx specifications

Specifications of eryx
Section	Developer Tools
Website	eryx.run
Votes²	0

eryx metrics

Fact file for eryx.run: Ahrefs Domain Rating and Majestic link facts, each with the change since the last fact check.
Metric	Value
Domain Rating	0 no change since last check
Trust Flow	0 no change since last check
Citation Flow	6 no change since last check
Referring domains	2 no change since last check
External backlinks	2 no change since last check

Fact: Ahrefs Domain Rating checked 11 Nov 2026, fact changed 11 Nov 2026. Fact: Majestic checked 11 Nov 2026, fact changed 11 Nov 2026. Link facts from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

eryx domain fact sheet

Open the fact sheet

Read from the public RDAP record on 11 Nov 2026, 21:50 UTC.
Domain age	9 months
Registered	31 Jan 2026
Expires	31 Jan 2027
Registrar	NameCheap, Inc.
DNSSEC	Not signed

Every domain fact for eryx.run

eryx launch receipt sheet

What we have measured for eryx since it went live on SaaS Directory Info on 11 November 2026.

0 Domain Rating (Ahrefs)
first measured 11 Nov 2026
0 Trust Flow (Majestic)
first measured 11 Nov 2026
2 Referring domains (Majestic)
first measured 11 Nov 2026

Day 0 since launch. Next receipt: day 30, 11 Dec 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.

Biggest gains on SaaS Directory Info

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Frequently looked up

Q1How fast does eryx start new sandboxes?: New sandboxes start in about 1–5 milliseconds.
Q2What isolation does the sandbox provide?: The sandbox has no filesystem or network access unless you explicitly allow it, with limits on every run.
Q3Can sandboxed code call functions from the host?: Yes, sandboxed code can await the functions you expose as callbacks.

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