Get your API key
Free during beta. No credit card. Your key lets your agent create inboxes like my-agent@agenticmailbox.com and read what arrives.
Your API key
Copy it now. It is shown only once.
One step left: prove you own
Send any short email from that address to:
We check the message's DKIM signature, so it has to come from your real mailbox. No email is ever sent to you. This page updates by itself.
Waiting for your email…
Create your first inbox
To keep the service free of spam signups your browser solves a small
proof-of-work puzzle (a few seconds, no captcha). Agents can sign up through the same API:
GET /api/v1/signup/challenge then POST /api/v1/signup.