The beta is free, open, and it does not end.
Join now and your invite goes out when the beta opens, one at a time until everyone in the queue has one. The beta is the free tier, so there is no day when it stops and a bill arrives.
Do you get in?
Yes. Everyone who joins gets in: it is a queue, not a selection. Keys are issued by hand, one at a time, by a person, so there is a wait and we would rather say so than name a date we cannot keep. When it is your turn you get one email with your key. Until then you hear nothing from us.
Can you be charged?
No, and not as a promise. There is no sign-up form, you never gave us a card, and the company that takes payments for us does not know you exist. You start on the free tier and stay there until you outgrow it; what happens then is on the pricing page, in numbers, today.
What is actually in it?
Email, the durable engine whole, subscribers and topics, the API and the SDK, and not the other five channels, the dashboard or the MCP server. That answer carries a date, because it changes, so it lives in a post rather than here.