What sources does google use to determine if my password has been compromised?

Question

Google

Task, compromised, breached password protection, validation.
Chrome constantly gives hints that this and that passwords have been cracked and found somewhere.
But the fact is that one way or another, each password has already been compromised and lies in the rainbow tables.

Which of these APIs are open and can be used to check a user's password, and which ones does google use?

Let's use Google as an example.

Answer 1

- Check if your password is on the Internet:
- [email protected]#2DgDD
- Now there is!