Block compromised logins in real-time.
Protect your users from account takeovers. Our API checks logins against billions of leaked passwords in real-time. Currently in free Open Beta: Test the full performance with zero limitations. 100% Hosted in Germany, Zero Cloud Act.
Maximum Compliance
Data processing exclusively in German data centers. Zero Cloud Act, fully GDPR compliant, and ready for your next security audit.
Privacy by Design
Full security using k-Anonymity. You only send hash prefixes to our API – we never see the actual passwords.
Zero Auth Bottleneck
Millisecond latency at the edge. Our infrastructure won't slow down your login flow by a single millisecond, even under heavy load.
Billions of compromised records.
Updated daily.
A leak check API is only as good as its data. We continuously aggregate verified data breaches, credential stuffing lists, and intelligence from the global security community. Your system queries one of the most up-to-date and comprehensive hash databases in Europe within milliseconds.
Why leak checks are essential today →Security by Architecture.
We never process plaintext passwords. Our system is built on zero-knowledge principles to guarantee maximum security for your users.
1. Local Hashing
Your server hashes the password locally. The real password never leaves your infrastructure.
2. k-Anonymity Transfer
You only send 5-character hash prefixes. We receive data that is mathematically impossible to reverse-engineer.
3. Instant Match
The final verification happens securely on your server – lightning fast and with zero data risk.