Mastra
YC W25 ↗San Francisco, US · Founded 2024 · 30 employees · 10 known investors
Mastra is an open-source TypeScript framework for building AI agents. The platform serves developers and teams building agent-based applications.
AI & Machine LearningDeveloper ToolsEnterprise SoftwareArtificial IntelligenceOpen SourceAIin /mastra-ai/@mastra_aiycombinator.com ↗
Founders & leadership· Y Combinator alumni (W25)
Investors · 10
Y Combinator✓ verifiedSan Francisco · $500K
Spark Capital✓ verifiedSan Francisco · $500K – $25M
Broom VenturesSan Francisco
Gradient VenturesSan Francisco · $100K – $10M
Moonfire VenturesLondon
SAV (Scale Asia Ventures)Palo Alto
Transpose Platform ManagementHouston
Lombardstreet VenturesreportedWoodside · $500K
Script CapitalreportedSan Francisco · $250K – $500K
SV AngelreportedSan Francisco
In the news
- npm Supply Chain Attack: North Korea Hits Mastra AI [2026]tech-insider.org · 2026
- We raised a $22M Series A to help every developer build agents - Mastra Blogmastra.ai · 2026
- Mastra Raises $13M Seed for TypeScript AI Frameworktechnews180.com · 2025
- Announcing our $13m seed round from YC, pg, Gradient, Amjad, Guillermo, Balaji, and 120+ others | Mastra Blogmastra.ai · 2025
- Mastra: the open-source JavaScript framework for building agentsycombinator.com · 2025
- Who Funded Mastra? — Investors & Funding History | Billion Dollar Pitch Decksbilliondollarpitchdecks.com