$3,850/month automation agency running on a $4.80/month open-source stack
An agency blueprint built entirely on free and open-source tooling: self-hosted n8n, a $4.80/month Hetzner VPS, Twilio, Groq's free tier and Supabase free. The flagship flow detects a missed call, sends an SMS within five seconds, has AI triage the need, and books a slot automatically. Self-reported; the uptime claims deserve skepticism, but the stack economics are the real lesson.