A sandbox your agent can sign up for itself (no browser, no card)
Updated
Your coding agent can make your Prized account with no browser and no card, one call with your email address and one with the 6-digit code Prized emails you, then start a cloud sandbox. The steps it follows, and what you approve.
On this page8
Ask your coding agent for a sandbox and it can make your Prized account itself. You give it your email address, then the 6-digit code Prized emails you. No sign-up page to open, and no card to add at sign-up.
Sign me up for Prized with my email address by following https://prized.dev/auth.md, then start a sandbox and run python3 --version in it.What the agent does
- Registers with your email address. One call to
POST https:/; Prized emails you a 6-digit code./ api.prized.dev/ api/ v1/ agent/ identity - Asks you for the code. It sends the code back; your account now exists, in a workspace of its own, and the agent holds its API key.
- Starts a sandbox.
POST https:/, then runs commands, copies files, forks and pauses it (Agent quickstart)./ api.prized.dev/ api/ v1/ sandboxes?wait=running
The agent follows https://prized.dev/auth.md, which has each call, its answers, and shell commands that keep the key out of its output. That file follows the open auth.md format for agent registration, so an agent that knows the format finds the endpoints on its own.
What you approve
- The code. Nothing is made until you give your agent the code from your inbox. It lasts 15 minutes; share it only if you just asked an agent you trust to sign you up.
- The key, at your first sign-in. The first time you sign in to Prized, you see the agent's key before anything else and keep or revoke it (Agent sign-in).
- What the key can do. It creates and uses sandboxes and boxes and reads the workspace; it cannot read your secrets. Each sandbox it creates is on your audit log. It expires after 90 days.
- Money. The agent never pays or picks a plan. When money would lift a limit, its refusal links your Billing page, and you decide.
What it costs
New accounts get $30 of free credit, with no card. For an account an agent makes, it comes once per inbox, once a day per email domain, and within a daily total for all agent sign-ups, so it may not come; the claim's answer says whether it did (free_credit). On the free credit, sandboxes run within the free tier. An account without it needs a top-up or a plan before its first sandbox.
Already on Prized?
Agent sign-up only makes new accounts: for an address that has one, it answers sign_in_required and makes no key. Make your agent a key at https://prized.dev/dashboard/workspace/api-keys with Sandboxes: Write instead.
Common questions
Can an agent sign up without me?
No. It needs your email address and the code Prized sends there, and you choose to keep or revoke its key the first time you sign in.
Which other sandbox services can an agent sign up for?
Of the services on Best cloud sandboxes for AI agents, checked November 5, 2026: E2B, Daytona and Modal have a person sign up in a browser and copy a key to the agent. boat takes an agent's registration through auth.md, then asks the person to sign in in a browser and add a card before the first sandbox.
Can it make a box instead?
Yes. The same key starts a box, a Linux machine with no maximum run time; Agent sign-in has the box steps.