How It Actually Works

What You're Getting

Fat Agents is managed pi-mono hosting.

We run pi-mono (an open-source AI agent framework by Mario Zechner) in a Cloudflare Container. You bring your Anthropic API key. We charge $9/month.

That's it. That's the product.

The Stack

Here's exactly what runs when you sign up:

┌─────────────────────────────────────┐
│         Cloudflare Edge             │
├─────────────────────────────────────┤
│  Container (Docker)                 │
│  ├── Node.js server on :8080        │
│  └── pi-mom process                 │
│      ├── Slack WebSocket            │
│      ├── Anthropic API calls        │
│      └── Local workspace            │
└─────────────────────────────────────┘

The container runs @mariozechner/pi-mom, which connects to your Slack via Socket Mode and makes Claude API calls with your key.

The Dockerfile

This is the actual Dockerfile we use. No secrets:

FROM node:20-alpine
WORKDIR /app
RUN npm install -g @mariozechner/pi-mom@latest
EXPOSE 8080
CMD ["node", "/app/server.js"]

The server starts pi-mom as a child process and keeps it running. That's it.

What It Costs Us

We're going to tell you our costs. Because why not?

We charge $9. Our margin is 70-85%. We think that's fair for not having to deal with any of this yourself.

What It Costs You

Why Not Just Do It Yourself?

You could! Here's the DIY path:

1. Get a $6/month VPS (Hetzner, DigitalOcean, etc.)
2. Install Docker
3. Clone pi-mono
4. Create a Slack app, get tokens
5. Configure environment variables
6. Run the container
7. Set up monitoring so it restarts when it crashes
8. Keep pi-mono updated

Total time: A few hours. Ongoing maintenance: Some.

Or: Pay us $9/month and paste some tokens. Your call.

The Source Code

Everything is open:

• pi-mono — The agent framework (MIT license)
• fat-agents — This website
• fat-agent-container — The container config

Inspect it. Fork it. Run it yourself. We don't mind.

Why Are You Telling Us All This?

Because most AI companies won't.

They obscure the implementation. They use vague terms like "proprietary AI" and "enterprise-grade infrastructure" to justify charging 10x what it costs them.

We can't do that. The math works at $9 with 80% margins. We don't need to hide anything.

Radical transparency is the product. If you trust us because we're honest, that trust is worth more than any moat we could build.