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Inside The Batch
Interviews every week with a YC Founder. Hosted by a YC Founder.
Inside The Batch
The YC Startup That Gave Away 80,000 Books: Mastra (YC W25)
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https://mastra.ai
In today’s episode, we sit down with the co-founder of Mastra — the YC Winter 2025 startup that gave away 80,000 physical books to jump-start adoption and build community.
We dive deep into:
• Why they chose the bold move of distributing 80,000 books instead of just digital hype.
• How Mastra is re-architecting how AI agents are built and deployed — beyond simple chatbots.
• The founder’s origin story: from open-source and web frameworks to the bleeding edge of agent technology.
• The tools, the hacks and the orphaned prompts most devs don’t know but Mastra is solving.
• What comes next: how this startup plans to turn developer momentum into an AI infrastructure business.