Series A
$22M
Y CombinatorSpark Capital · Lead
Open roles0
Total raised$22M
Team size1-10
Founded · Stage2024 · Series A
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About the company
What they build and who they serve.
Mastra is an open-source TypeScript agent framework for building AI agents and multi-agent pipelines. Used in production by companies including PayPal, Adobe, and Replit, the framework provides primitives for tool calling, workflow orchestration, retrieval-augmented generation (RAG), and agent memory. Built by the team behind Gatsby, Mastra aims to make agent development for JavaScript and TypeScript developers as accessible and composable as modern web development.
Why it matters
Signals from funding, traction, and product direction.
- $13M seed round from 120+ investors including Y Combinator, Gradient Ventures and founder angels Paul Graham and Guillermo Rauch
- Open-source TypeScript framework in production at PayPal, Adobe, and Replit for building AI agents and multi-agent workflows
- Built by the team behind Gatsby; provides primitives for tool calling, workflow orchestration, RAG, and agent memory
- Round brings total capital raised to $35M, following a $13M seed in October 2025
- Used by PayPal, Adobe, and Replit in production environments
- Mastra platform officially launched alongside the Series A announcement
Funding history
Rounds and investors over time, newest first.
Seed
$13MY Combinator · LeadPaul GrahamGuillermo RauchGradient Ventures (Google's AI fund)
In the news
Press, announcements, and coverage about this company.
Investors
Y CombinatorSpark Capital
Focus areas
Early StageAI AgentsDevToolsDeveloper ExperienceEnterprise SoftwareOpen Source SoftwareProductivity Software
No open roles on the board yet
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