An API that can be used to check if a password has been leaked
http://161.97.98.28:8080/brockyou/api/v2/{yourpassword}
true if the given password has been leaked, false otherwise.
The database used to check if the password was found in leaks from the last few years can be found here:
https://github.com/Leminee/BetterRockyou
This contains over 60 million passwords.