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Crosslayer Labs

YC W26

New York City, US · Founded 2025 · 3 employees · 12 known investors

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Crosslayer Labs provides cybersecurity solutions that discover, analyze, and monitor network infrastructure vulnerabilities across multiple layers to protect HTTPS websites and APIs from attacks. The platform serves healthcare, fintech, banking, and cryptocurrency organizations with attack surface discovery, security analytics, and ongoing threat monitoring.

CybersecurityEnterprise SoftwareSaaSUnited States of AmericaAmerica / CanadaPartly Remote

Founders & leadership· Y Combinator alumni (W26)

Crosslayer Labs was founded in 2025 by Henry Birge-Lee, Grace Cimaszewski, and Prateek Mittal.

HBHenry Birge-Lee
Henry Birge-LeeCo-founder · Chief Executive OfficerHenry Birge-Lee works on web and network security, having contributed to HTTPS security infrastructure. He is now developing the Crosslayer Labs platform focused on web resource integrity.
GCGrace Cimaszewski
Grace CimaszewskiFounder, CTOGrace Cimaszewski holds a PhD from Princeton and has conducted security research on TLS certificate security, contributing to standards adopted by the CA/Browser Forum. She previously held research positions at Google and Corelight Labs before founding Crosslayer Labs with fellow researchers.
PMPrateek Mittal
Prateek MittalFounderPrateek Mittal is a computer science professor at Princeton University specializing in cybersecurity and privacy, and co-founder of Crosslayer Labs. He has received the ACM Grace Hopper Award and has contributed research to HTTPS security protocols and large language model security at OpenAI.

Investors · 12

RWT Horizonslisted by RWT HorizonsOrange

How we know: RWT Horizons's portfolio page · Not right? Tell us

Vectro Fundlisted by Vectro Fund

How we know: Vectro Fund's portfolio page · Y Combinator's founder network · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · open dataset · 5k.vc investor directory · Not right? Tell us

Array Ventures Management LlcreportedSan Francisco · $1.5M

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Blast.Clubreported$5.5M

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Cleo CapitalreportedNew York · $100K – $1M

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Exit Venturesreported

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Founders FactoryreportedLondon · $150K – $200K

How we know: Y Combinator's founder network · Not right? Tell us

Lombardstreet VenturesreportedWoodside · $500K

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RobinhoodreportedMenlo Park

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Seedradar Venturesreported

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Related companies · 7

RunlayerRunlayer builds a trust and safety layer that enables enterprises to deploy AI agents and integrations across their organizations securely. The platform makes enterprise AI adoption manageable by providing control and safety guardrails between enterprises and their AI infrastructure.
LevelBlueLevelBlue is a pure-play managed security services provider (MSSP) offering intelligence-led, AI-powered cybersecurity services including threat detection, containment, and resilience for regulated, hybrid, and high-risk environments. It serves organizations needing to reduce cyber risk and protect their operations, backed by government-grade authorizations and threat intelligence.
Bricklayer AIBricklayer offers an AI assistant that converts natural-language requests into structured security workflows for incident investigation, letting users build, refine, and execute investigation plans and save them for reuse. It serves security operations teams within the cybersecurity domain.
BaselayerBaselayer provides a platform that unifies public records, AI agents, and networked intelligence to verify, score, and monitor business identity and risk for fintechs, banks, and B2B platforms in real-time, replacing manual KYB processes with automated verification and compliance monitoring.
Silent PushSilent Push operates a proprietary scanning and aggregation engine that logs changes across the entire IPv4 and IPv6 space, providing security teams with pre-evaluated first-party data and query functionality to track and monitor attacker infrastructure. The company serves organizations' threat intelligence operations, aiming to surface the majority of live attacker infrastructure that most security data misses.
Sentinel OneSentinelOne provides an AI-powered cybersecurity platform for enterprises that integrates endpoint protection, threat detection, and incident response capabilities. The company serves large enterprises, including many Fortune 500 organizations, to protect against cyber threats at scale.
Immersive LabsImmersive Labs provides cybersecurity training and labs where teams practice response to emerging threats and current attacker methods. The platform keeps security teams current with real-world threat scenarios and vulnerability shifts.

Companies working in the same space as Crosslayer Labs.

Legal entities · 1

corporate structure
Crosslayer Labs, Inc.

In the news

16 of the most interesting startups from YC W26 Demo Daytechcrunch.com · Mar 2026Crosslayer Labs: We discovered (and can protect you against) a new attack allowing hackers to spoof any website(!)ycombinator.com · Feb 2026Crosslayer Labs Funding | Complete Analysis | Extruct AIextruct.ai

Frequently asked questions

What does Crosslayer Labs do?
Crosslayer Labs provides cybersecurity solutions that discover, analyze, and monitor network infrastructure vulnerabilities across multiple layers to protect HTTPS websites and APIs from attacks. The platform serves healthcare, fintech, banking, and cryptocurrency organizations with attack surface discovery, security analytics, and ongoing threat monitoring.
Who founded Crosslayer Labs?
Crosslayer Labs was founded by Henry Birge-Lee, Grace Cimaszewski, Prateek Mittal in 2025.
Who are Crosslayer Labs's investors?
Crosslayer Labs's investors include Rebel Fund, RWT Horizons, Vectro Fund, Y Combinator, Array Ventures Management Llc, Blast.Club, Cleo Capital, Exit Ventures and 4 more.
Where is Crosslayer Labs headquartered?
Crosslayer Labs is headquartered in New York City, US.