# Zappy

- **Event:** [Built with Opus 4.7: a Claude Code hackathon](https://cerebralvalley.ai/e/built-with-4-7-hackathon)
- **When:** Apr 21 at 12:00 PM – Apr 27 at 2:00 AM (EDT)
- **Where:** Online
- **Team:** [Emmanuel Yeboah](https://cerebralvalley.ai/u/noelzappy)
- **GitHub:** https://github.com/noelzappy/chatalog
- **Demo video:** https://youtu.be/jm9CYxypzC8
- **Gallery:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/135

Chatalog is an AI-powered WhatsApp order management system built for Ghanaian small businesses. In Ghana and across West Africa, WhatsApp is the primary commerce channel; customers already message businesses to place orders. Chatalog formalises this:
  Customers order in natural language via WhatsApp, and Claude runs an agentic tool-calling loop that understands the request, checks the menu, creates the order, and replies naturally, no app download, no account needed.

Store owners get a real-time admin dashboard with a Kanban board (new → confirmed → preparing → in transit → delivered), drag-and-drop status updates that instantly notify customers on WhatsApp, a natural language command bar for updating menu items, and automated payment nudges for unpaid orders. 

The core is an agentic loop: Claude receives a WhatsApp message, calls tools to read/write the PostgreSQL database, and iterates until it produces a final reply. Tools follow a strict read (get_*, list_*) / write (create_*, update_*, cancel_*) convention. Built with FastAPI + asyncpg on the backend and Next.js 16 + Tailwind v4 on the dashboard.

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Markdown version of https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/135. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt