Been building this for 3 weeks. Here's the honest technical breakdown.

What I Built

A fully automated marketing company run by AI agents:

CalcFuel — 20+ free marketing calculators (top-of-funnel)

A $19 AI prompt pack — sold via Stripe, auto-delivered via webhook

Email opt-in funnel — MailerLite list building from calculator pages

Bluesky/Mastodon auto-posts — cron jobs push tool updates to social

All orchestrated by Claude AI agents running on Paperclip with zero human code written.

The Stack (All Free Tiers)

Layer Tool Cost

Frontend Next.js + Vercel $0

Email MailerLite $0

Payments Stripe 2.9% + 30¢ per sale

AI agents Claude via Paperclip Monthly

Analytics Vercel Analytics + GA4 $0

Social Bluesky API, Mastodon API $0

The only real cost is the Claude API usage for the agents themselves.

The Automated Funnel Flow

Visitor lands on CalcFuel calculator → Runs a free calculation → Sees email opt-in CTA ("Get your full marketing checklist") → Joins MailerLite list (opted-in) →…