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 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 for the full picture, check the sandbox overview to create your first template, and see pricing for the full rate card. Questions? Write to us at info@watasu.io.