I built 26 MCP servers in 2 days. Here's what I learned about x402 monetization.

Hey IH,

I've been experimenting with AI-agent monetization over the last week. Today I shipped my 26th MCP server, and I want to share what I learned — especially about x402 (the "pay-per-call" protocol for AI agents).

What I built

26 MCP servers on MCPize, all with x402 monetization:

• 25 utility servers: validators, converters, formatters (VAT, IBAN, SWIFT, LEI, JWT, cron, color, etc.)
• 1 AI server: HS Codes Classifier — takes a product description, returns a customs HS code via GPT-4o-mini

Plus 2 REST APIs on Cloudflare Workers:

• hs-codes-classifier.boring-saas-infra.workers.dev — same HS classifier, but as a REST endpoint
• document-to-json.boring-saas-infra.workers.dev — extracts structured JSON from invoice text

Why x402?

I'm in Ukraine. Stripe doesn't pay out here. PayPal is half-broken. Lemon Squeezy, Gumroad, Dodo — same story.

Crypto (USDC on Base) is the only viable payment path. And x402 makes it native for AI agents:

• No signup
• No API keys
• No OAuth
• AI agent calls your endpoint → gets 402 → pays USDC → gets result
• 0% fees (vs Stripe 2.9% + $0.30)

What worked

1. Cloudflare Workers + Furlpay = perfect stack for stateless x402 APIs

   • 7ms cold start
   • 100k requests/day free
   • No database needed
   • One middleware = paywall

2. MCPize = distribution for MCP servers

   • Their Marketplace gets organic discovery
   • x402 billing built-in
   • $0 to list

3. gpt-4o-mini = cheap, reliable AI

   • $0.15/1M input tokens
   • At $0.01/call, margin is healthy even with heavy use

What didn't work

1. Reddit — my account (2 weeks old, 4 karma) got auto-filtered on r/SideProject. Need 10+ karma first.
2. mcpize dev on Windows — broken (port conflict with itself). Use npm run dev instead.
3. Express + Cloudflare Workers — incompatible. Use Fetch API (export default { fetch }).

Numbers (so far)

• 26 MCP servers live
• 2 REST APIs live
• 0 subscribers (just launched)
• $0 revenue (just launched)
• $0 spent on infrastructure

Next: trying to get the first paying customer. Any advice?

Happy to answer questions about MCP, x402, Cloudflare Workers, or the Furlpay gateway.