have i been pwned? - Check if your account has been compromised in a data breach
Secureito - Secureito is a platform that gives everyone the opportunity to find out if their email has been compromised.
Hashcast - Hashcast monitors leakage of your company’s emails and passwords on the Web, including the deep and dark web.
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LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries