Crosslayer Labs
Crosslayer Labs is a YC Winter 2026 (W26) company. Based in New York City, NY, USA. Team of 3.
About Crosslayer Labs
Summary
Crosslayer Labs builds an outside-in security platform that detects impersonation attacks targeting websites and APIs. It continuously discovers and monitors an organization's full internet footprint, spanning DNS, BGP, TLS certificates, and JavaScript, then correlates signals across those layers to identify attack patterns and deliver root-cause remediation guidance. The product replaces manual, siloed network monitoring for companies that depend on the web for secure operations.
Go-to-market
The platform targets companies and enterprises with internet-facing infrastructure, with a free security assessment as the entry point to convert prospects into customers.
From the Y Combinator listing
Protect, monitor and defend your Internet presence
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.
Facts
- B2B / B2B -> Security
- New York City, NY, USA
- 3
- Active
- Early
Founders (3)
- Grace Cimaszewski
- Henry Birge-Lee
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