Have your passwords been pwned? https://www.gizmodo.com.au/2018/02/1password-helps-you-find-out-if-your-password-is-pwned/
Proviso: only works if you're a user of the 1Password monthly subscription service. No good for me, I have a 1P licence instead, so I have no 1P account to log in to.
1Password will add the "have I been pwned" feature to their Watchtower in future releases of the software.