MouseCat enables companies to detect suspicious activity, automate investigations, and act before the money leaves. We work with Fortune 500 companies and startups to deploy real-time models and AI agents that reduce fraud, compliance incidents, and friction for good customers.
MouseCat is a Y Combinator company in the Winter 2026 batch. Its directory entry describes it as: AI to fight financial crime. The founders listed are Nicholas Aldridge (Founder/CEO), Joseph McAllister (Founder/CTO) (Y Combinator directory entry, January 22, 2026).
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
MouseCat enables companies to detect suspicious activity, automate investigations, and act before the money leaves.
We work with Fortune 500 companies and startups to deploy real-time models and AI agents that reduce fraud, compliance incidents, and friction for good customers.
Checked away from the directory entry. What is below does not come from the company's Y Combinator page.
Identify, investigate, and stop bad actors before the money leaves — from your first dollar to your billionth.
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Nicholas Aldridge
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.
Joseph McAllister
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).
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
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The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
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Warning Bells
Sources
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