Explore · The library

Every resource founders actually use, in one library.

The essays, videos, podcasts, books and tools behind every answer across eChai's hubs, from starting up to go-to-market, D2C, founder money and AI, each with a note on why it is here.

What founders use most, ranked by how many answers lean on it.

  1. A rival platform's surprisingly fair breakdown of the two power-user tools. zapier.com Article · How Founders Use AI n8n vs. Make: which is best? Zapier
  2. Helps you pick by team skill level rather than feature checklists. flowmondo.com Article · How Founders Use AI n8n vs Zapier vs Make: which is right for you Flowmondo
  3. Video · How Founders Use AI Agentic AI Frameworks Explained: Workflows, Multi-Agent, & Production IBM Technology
  4. Demystifies the harness, the code around the agent that makes it dependable. lennysnewsletter.com Podcast · How Founders Use AI How I AI: What an agent harness is and how to build one How I AI (Lenny's network)
  5. Condenses Anthropic's build guidance into checklist form. maryammiradi.com Article · How Founders Use AI Build AI Agents: 40 Key Lessons from Anthropic's Masterclass Maryam Miradi
  6. The full course repo covering smolagents, LlamaIndex and LangGraph side by side. github.com Tool · How Founders Use AI Hugging Face Agents Course (GitHub) Hugging Face
  7. An India-based roundup of free certified learning paths per framework. analyticsvidhya.com Article · How Founders Use AI 15 Free Courses on AI Agents with Certificates Analytics Vidhya
  8. A quick no-code vs code triage before you commit a weekend. easyclaw.com Article · How Founders Use AI How to Build AI Agents: 5 Best Platforms EasyClaw
  9. Names the paradox every founder hits: cheaper tokens, bigger bills. navyaai.com Article · How Founders Use AI AI Token Cost Over Time: Down 99.7%, Bills Up 3x NavyaAI
  10. Explains the quadratic context growth that quietly multiplies agent costs. leanopstech.com Article · How Founders Use AI AI Agents Burn 50x More Tokens Than Chats LeanOps
  11. How large buyers model agent economics, useful when selling to them. ey.com Article · How Founders Use AI Agentic AI Enterprise Token Cost EY
  12. Concrete per-task cost ranges from cheap chatbot turns to $5+ agent runs. cowork.ink Article · How Founders Use AI AI Agent Cost: Token Economics & Optimization Guide Cowork
  13. Walks through the exact math of an agent whose unit economics collapse. medium.com Article · How Founders Use AI Token Cost Trap: Why Your AI Agent's ROI Breaks at Scale Klaus Hofenbitzer
  14. One page comparing how each provider's caching discount actually works. prompthub.us Guide · How Founders Use AI Prompt Caching with OpenAI, Anthropic, and Google Models PromptHub
  15. Estimate a task's cost across models before you commit to one. tokencalculator.ai Tool · How Founders Use AI AI Token Calculator TokenCalculator
  16. Live per-model pricing so your cost model never goes stale. usagepricing.com Tool · How Founders Use AI AI Token Pricing Tracker UsagePricing
  17. Shows 72% of production cost sits outside the model invoice. optimumpartners.com Article · How Founders Use AI AI Token Costs: Why Enterprise AI Bills Keep Rising Optimum Partners
  18. A hands-on implementation guide with before-and-after cost numbers. digitalocean.com Guide · How Founders Use AI Prompt Caching for Anthropic and OpenAI Models DigitalOcean
  19. Investors debate agent pricing and unit economics in plain language. open.spotify.com Podcast · How Founders Use AI What Is an AI Agent? (pricing and economics discussion) a16z
  20. Saves you from the premature self-host-a-model cost trap. ml6.eu Article · How Founders Use AI Why 'Cheaper Tokens' Isn't a Good Reason to Own Your LLMs ML6
  21. Why the price curve should keep falling, and what that means for your roadmap. weightythoughts.com Article · How Founders Use AI AI's Plummeting Prices Are a Software Story, Not a Hardware One Weighty Thoughts
  22. The clearest official explanation of what an agent eval actually is. anthropic.com Guide · How Founders Use AI Demystifying evals for AI agents Anthropic
  23. The philosophy behind the top-grossing evals course, free to read. hamelhusain.substack.com Article · How Founders Use AI AI Evals For Engineers & Product Managers Hamel Husain
  24. Video · How Founders Use AI Why AI evals are the hottest new skill for product builders Lenny's Podcast (Hamel Husain & Shreya Shankar)

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1327 questions GTM Go-to-market, from breaking in to how the best teams do it. 379 questions D2C Building a direct-to-consumer brand, India-first. 512 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 165 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 360 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 425 terms