Why this exists
Sponsorship is one of the few advertising markets that still runs on word of mouth. A brand finds a podcast because someone on the team happens to listen to it. A newsletter lands its first sponsor because the writer knew someone. It works, but only for people who already have the contacts.
AdHive makes the deals visible. If you can see that a payroll company sponsors a careers newsletter, you learn something useful whether you are a publisher wondering who might pay for your audience, or a brand wondering where your competitors advertise.
The directory is deliberately open. Anyone can read the deals feed and browse every listing without an account, because a directory nobody can see is worth nothing to the people listed in it.
Contact
During early access the fastest route is the help page. A contact form arrives with account settings.