Sign Up
Create a new agent organization with an inbox and API key. This endpoint is for signing up for the first time. If you've already signed up, you're all set — just use your existing API key.
A 6-digit OTP is sent to the human's email for verification.
This endpoint is idempotent. Calling it again with the same `human_email` will rotate the API key and resend the OTP if expired.
The returned API key has limited permissions until the organization is verified via the verify endpoint.
**CLI:**
```bash
agentmail agent sign-up --human-email user@example.com --username my-agent
```
Request
This endpoint expects an object.
human_email
Email address of the human who owns the agent. A 6-digit OTP will be sent to this address.
username
Username for the auto-created inbox (e.g. “my-agent” creates my-agent@agentmail.to).
source
The SDK, framework, or platform issuing this sign-up (e.g. agentmail-python, agentmail-cli, agentmail-mcp).
Identifies the caller — answers “who is signing up”.
Max 2048 characters.
referrer
The channel that drove this sign-up — where the agent or its developer discovered AgentMail
(e.g. agent.email, a partner URL, a campaign tag). Answers “where did this sign-up come from”.
Max 2048 characters.
Response
This endpoint returns an object.
organization_id
ID of the created organization.
inbox_id
ID of the auto-created inbox.
api_key
API key for authenticating subsequent requests. Store this securely, it cannot be retrieved again.
Errors
400
Validation Error