You can pay for just one month at a time. I pay now and then and check in on my personal domain – like you, I use dozens of email addresses with a catchall.
The first tier ($4/month) only works for up to 25 aliases. Depending on how many of your aliases have leaked, you may have to pay a lot to perform that check.
I wish HIBP had a solution for those of us who are individuals but use domain catchall forwarding as our method for separating accounts.
Agree completely. I got ownership of my domain before he started charging, but looking now there's only a summary and it lists 45 email addresses in breaches, which means I need to pay a substantial amount to get a report, and I'm the only user of the domain for email.
I wish there was a "I'm just one person, or a small family" tier for this.