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have i been pwned? - Check if your account has been compromised in a data breach
Snusbase - The industry leading database lookup.
LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries
BreachDirectory.org - BreachDirectory.org allows you to search through all public data breaches to make sure your emails, usernames, passwords, and domains haven't been compromised.
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