Crosslayer Labs YC Application
Crosslayer Labs went through Y Combinator in the Winter 2026 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.
- YC batch
- Winter 2026
- Industry
- B2BSecurity
- Team size
- 3
- Status
- Active
- Launched
- 2026
Founders
Henry Birge-LeeFounder
Grace CimaszewskiFounder
Prateek MittalFounder
What Crosslayer Labs does
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.
Crosslayer Labs's YC application, reconstructed
Y Combinator application
Crosslayer Labs, Winter 2026 batch. The real form questions, answered from public data.
- Founders2
- Company7
- Progress7
- Idea4
- Equity3
- Curious2
- Batch Preference1
Company
Crosslayer Labs
Protect, monitor and defend your Internet presence
We build a system that detects impersonation attacks on websites and APIs by monitoring all external internet dependencies like DNS, BGP, TLS certificates, and Javascript. Our product correlates signals across different layers of the Internet stack to spot attack patterns and delivers actionable alerts with root cause analysis and remediation suggestions.
We live in New York City, NY, and plan to base the company here after YC.
We are based in New York City where we built our initial prototype and have deep local ties. Location suits our team and initial customers, and YC will help us grow from here.
21 more answers in the full application
Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.
Frequently Asked Questions
Is this the real Crosslayer Labs YC application?
No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Crosslayer Labs's public data (launch notes, founder backgrounds, product description). It shows how a company like Crosslayer Labs would present itself to YC, not the text they submitted.
What YC batch was Crosslayer Labs in?
Crosslayer Labs was part of the Y Combinator Winter 2026 batch.
Who founded Crosslayer Labs?
Crosslayer Labs was founded by Henry Birge-Lee, Grace Cimaszewski, Prateek Mittal.
What does Crosslayer Labs do?
Protect, monitor and defend your Internet presence
How do I read the full reconstructed application?
Create a free Round Funded account. The full 26-answer version of Crosslayer Labs's application, and every other YC batch, is in YC Insights.
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