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.…