[← Blog](https://watasu.io/blog) June 1, 2026 # Launching AI sandboxes Today we’re launching **sandboxes**: isolated Linux environments that start fast, bill by the second, and are built for AI-driven workloads. ## What a sandbox is A sandbox is a disposable Linux workspace created from a reusable template — a named environment definition with the packages and setup your tasks need. Through a simple API you can stream processes, upload and download files, expose an HTTP preview URL at a `*.sandbox.watasuhost.com` address, take a disk checkpoint mid-task, and tear everything down when the work is done. Each sandbox is fully isolated from your apps and from other sandboxes. Whatever runs inside — including code your agent just wrote — stays inside. ## What they’re for Sandboxes fill the gap between “run this code somewhere safe” and “deploy a full app”: - **AI agent workspaces.** Give an agent a real shell, a real filesystem, and a preview URL — without giving it access to anything else. - **Code execution.** Run untrusted or LLM-generated code behind an API call instead of on your own infrastructure. - **CI-style jobs.** Short-lived builds, test runs, and data tasks that need a clean machine for ninety seconds, not a server for a month. - **Prepared environments.** Templates capture packages and setup commands once, so every sandbox starts ready to work. Checkpoints make longer agent sessions practical: snapshot the disk while a task is in progress, and restore it into a fresh sandbox if the task needs to pause, branch, or recover. ## Billing that matches the workload Sandboxes bill **per second** for the vCPU and memory you actually request. A 2 vCPU / 1 GiB sandbox costs about €0.08 per hour while it runs — a 90-second job costs a fifth of a cent. Stop a sandbox and you pay only for its retained disk, ready for instant resume; destroy it and you stop paying entirely. And because Watasu is prepaid, a runaway agent spins down your balance — never an open-ended bill. ## Who should take a look If you’re building AI agents or copilots that execute code, an LLM product that needs a safe place to run generated programs, or a platform that offers code execution to your own users — sandboxes were built for you. They’re equally at home running plain automation: scrapers, report generators, scheduled jobs that don’t justify a standing service. For long-running web services and workers, [apps](https://docs.watasu.io/apps/deploy/) remain the right tool — and sandboxes sit right next to them on the same account, balance, and API. ## Get started Sandboxes are available to everyone today. Start with the [sandboxes page](https://watasu.io/sandboxes) for the full picture, check the [sandbox overview](https://docs.watasu.io/sandboxes/overview/) to create your first template, and see [pricing](https://watasu.io/pricing#sandboxes) for the full rate card. Questions? Write to us at .