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Crosslayer Labs

Protect, monitor and defend your Internet presence

y-combinatorWinter 2026🇺🇸 New York City3 people
Grace Cimaszewski
Henry Birge-Lee
Prateek Mittal

Grace Cimaszewski, Henry Birge-Lee +1 · 3 co-founders

2026Founded
Team
3
current
Co-founders
3
current
Stage
Founded
Source for Founded
Profile coverage4 of 8 · missing Funding, Signals, Customers, Stack / tools · last run 8/8/2026

About

Crosslayer Labs detects impersonation attacks on websites and APIs. We provide "outside-in" monitoring of customer infrastructure, comprehensively discovering and monitoring all Internet dependencies, including DNS, BGP, TLS certs, Javascript. We correlate signals from different layers of the Internet stack to identify attack patterns. Our alerts are actionable and contain root cause analysis/remediation recommendations. Our founding team is world renowned for previously inventing the MPIC standard adopted by all the major CAs including Google, Apple, Amazon. The MPIC standard is securing over 700 million websites via the issuance of over 3 billion digital certificates, and is now a global internet standard that protects every single HTTPS connection.

3 founders