HaveIBeenPwned

Use the HaveIBeenPwned API to search for publicly leaked creds of harvested email addresses.

curl -s https://haveibeenpwned.com/api/v2/breachedaccount/<EMAIL> | python2 -m json.tool
curl -s https://haveibeenpwned.com/api/v2/pasteaccount/<EMAIL> | python2 -m json.tool

Search for (or build) a CLI tool.