I think you're mistaken, while HIBP has a paid service it will provide data on affected domains for free. Source: I monitor my domain for free at HIBP.
@asteriske@haveibeenpwned It is free until spammers have poisoned their database with more than a handful of invalid addresses at your domain when trying to guess a valid address. And then the next time you get an email notification of a breach and click through, you will encounter a paywall instead of the details of the breach.
Gregory's Server
@asteriske @haveibeenpwned It is free until spammers have poisoned their database with more than a handful of invalid addresses at your domain when trying to guess a valid address. And then the next time you get an email notification of a breach and click through, you will encounter a paywall instead of the details of the breach.