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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 sober corporate reference for checking any claim you hear at a demo day. ibm.com Guide · How Founders Use AI The 2026 Guide to AI Agents IBM In 2 answers
  2. Free and certified, it takes you from the definition to actually shipping a small agent. huggingface.co Course · How Founders Use AI Hugging Face AI Agents Course Hugging Face In 2 answers
  3. Reported stories of one-person companies plus an honest look at the limits. fortune.com Article · How Founders Use AI Solo founders are using AI to do the work of entire teams Fortune In 2 answers
  4. OpenAI's orchestration patterns apply whichever stack you choose. openai.com Guide · How Founders Use AI A Practical Guide to Building Agents OpenAI In 2 answers
  5. The single chart that explains why what is unaffordable today is cheap next year. a16z.com Article · How Founders Use AI Welcome to LLMflation: LLM inference cost is going down fast a16z (Guido Appenzeller) In 2 answers
  6. The headline numbers in thread form for a two-minute read. x.com Thread · How Founders Use AI LLMflation: 10x cheaper per year a16z In 2 answers
  7. Why KV-cache hit rate is the one production metric that decides agent margins. manus.im Article · How Founders Use AI Context Engineering for AI Agents: Lessons from Building Manus Yichao 'Peak' Ji (Manus) In 2 answers
  8. The full stack of costs behind a token price, for founders selling AI products. introl.com Article · How Founders Use AI Inference Unit Economics: The True Cost Per Million Tokens Introl In 2 answers
  9. Every question you will have about evals, answered by the field's top teacher. hamel.dev Article · How Founders Use AI LLM Evals: Everything You Need to Know (FAQ) Hamel Husain In 2 answers
  10. The course that trained 2,000+ people, including teams at OpenAI and Anthropic. maven.com Course · How Founders Use AI AI Evals For Engineers & PMs (Maven course) Hamel Husain & Shreya Shankar In 2 answers
  11. Patterns from 60+ agent companies distilled into a usable framework. growthunhinged.com Article · How Founders Use AI A new framework for AI agent pricing Kyle Poyar (Growth Unhinged) In 2 answers
  12. A catalogue of every live agent pricing model with examples. getmonetizely.com Guide · How Founders Use AI The 2026 Guide to SaaS, AI, and Agentic Pricing Models Monetizely In 2 answers
  13. The billing-infrastructure view of metering agents without angering customers. flexprice.io Article · How Founders Use AI Why AI Companies Have Adopted Usage-Based Pricing Flexprice In 2 answers
  14. A quick taxonomy to pick your starting model in an afternoon. pickaxe.co Article · How Founders Use AI AI Agent Pricing Models Explained Pickaxe In 2 answers
  15. Kills the 'wait for GPT-next' excuse; harness engineering is the work. venturebeat.com Article · How Founders Use AI LangChain's CEO: better models alone won't get your agent to production VentureBeat (Harrison Chase) In 2 answers
  16. The canonical guide: curation beats clever prompting for agents. anthropic.com Guide · How Founders Use AI Effective context engineering for AI agents Anthropic In 2 answers
  17. The write, select, compress, isolate framework every team now uses. langchain.com Article · How Founders Use AI Context Engineering for Agents LangChain In 2 answers
  18. Closes the loop: a prototype only pays off if you put it in front of users, and this shows how. maze.co Guide · How Founders Use AI How to test and validate AI prototypes with users Maze In 2 answers
  19. What to prompt when the tool gets stuck in a loop of broken fixes. blog.techforproduct.com Article · How Founders Use AI How to debug AI prototypes Colin Matthews (Tech for Product) In 2 answers
  20. The most rigorous framework for when AI research participants are and are not legitimate. nngroup.com Article · How Founders Use AI Synthetic users: if, when, and how to use AI-generated research Nielsen Norman Group In 2 answers
  21. The crispest articulation of the unknown-unknowns problem with AI feedback. radicalproduct.com Article · How Founders Use AI Synthetic users vs real user research: why AI falls short Radical Product Thinking In 2 answers
  22. A hot AI startup's own bot invented a policy and triggered cancellations; the cautionary tale of 2025. theregister.com Article · How Founders Use AI Cursor AI support bot hallucinated its own company policy The Register In 2 answers
  23. The business-impact view of the Cursor incident, including the labelling fix that followed. fortune.com Article · How Founders Use AI A customer support AI went rogue, and it's a warning for every company Fortune In 2 answers
  24. A neutral incident record, and a database worth browsing before you ship anything customer-facing. incidentdatabase.ai Article · How Founders Use AI AI Incident Database: Cursor support bot invents login policy AI Incident Database In 2 answers

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1046 questions GTM Go-to-market, from breaking in to how the best teams do it. 352 questions D2C Building a direct-to-consumer brand, India-first. 482 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 154 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 278 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 390 terms
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