The AI tool stack that runs XEdge for $0/month

People always ask what my infrastructure costs.
Here's the full stack:
Frontend: Vanilla JS + HTML/CSS — no framework, no build step, instant deploys
Database: Firebase Firestore — real-time, generous free tier
Hosting: Firebase + Cloudflare CDN — free + fast
Analytics: PostHog — privacy-first, free tier
Email: Brevo — free up to 300 emails/day
Payments: Gumroad — 10% + fees, zero setup cost
AI coding: Claude — $20/month, the only thing I actually pay for
Total: ~$20/month
You don't need $500/month in infrastructure to build something real.
You need good decisions and the right free tools.
Building xedge.tech — 500 users, 15 AI playbooks, one 18 year old.