A license for plumb check -- the one command that runs your repository's own verification commands. Everything else plumb does needs no license, permanently.
$8 per seat per month, billed annually. One seat is one person, across every machine you work on.
Verified offline: the license is a signed file checked on your own machine. No license server, no check-in, nothing transmitted -- which is also why it works air-gapped and behind a corporate proxy.
Your license key is emailed to you automatically, usually within a couple of minutes of the payment clearing. It is signed on a machine of mine rather than on a server, because the key that produces it is deliberately not kept anywhere a server could reach.
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