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MouseCat

AI-powered fraud investigations

Y CombinatorWinter 2026ActiveB2B

What they do

Problem

Companies struggle to detect, investigate, and stop emerging fraud trends quickly and efficiently.

Solution

MouseCat provides an AI-powered platform that automatically detects, investigates, and helps mitigate fraud trends.

Who it's for

Businesses that need to monitor and investigate fraud, typically fraud, risk, and compliance teams.

Founders

Nicholas Aldridge

Co-Founder & CEO

Nicholas Aldridge is the Co-Founder and CEO of MouseCat, and a core maintainer of MCP. He spent 6.5 years as a Principal Engineer at AWS AI, where he helped launch and lead Amazon Bedrock Knowledge Bases, Agents, and AgentCore. He also represented Amazon on the A2A steering committee. Nicholas has helped some of the largest and most security and privacy sensitive organizations in the world to plan and implement their AI strategies.

LinkedIn · X

Joseph McAllister

Co-Founder & CTO

Joseph McAllister is the Co-Founder and CTO of MouseCat. Before MouseCat, Joseph spent 4 years building systems that power every risk decision at Coinbase. He focused on streaming pipelines, large-scale data processing workloads, and improving ACH and ATO risk models. While studying Computer Science at Cornell University, he founded Roo Storage, which was acquired in 2020 by Handled (now UniGroup).