🍋 create-lemon-mcp

Scaffold a paid MCP server in one command. Buyers pay by card, agents call with spend-capped Pay Tokens, no crypto.

npx create-lemon-mcp my-paid-search
cd my-paid-search
npm install
npm run demo:agent

In ~10 seconds you see the LemonCake paid-call flow end to end — 402 → mint a sandbox Pay Token → pay per call → stop at the cap — with no key, no card, no crypto.

1. call with no Pay Token  → 402 Payment Required
2. minted sandbox Pay Token → $0.20 budget (20 calls @ $0.01)
3. agent calls, paying each time:
   → call # 1  paid $0.01  remaining $0.19
   ...
4. 402 — budget gone → the agent stops.

npm start runs the generated paid MCP server (remote / Streamable HTTP) locally.

demo → production is one env var

The generated server wraps its tool with @lemon-cake/mcp-sdk. Mode is decided by a single env var — no code change:

| LEMONCAKE_SELLER_KEY | Mode | What happens | |---|---|---| | unset | sandbox | the tool runs, nothing is charged (and npm run demo:agent shows the live paid-call flow) | | sk_live_… | production | every call meters the buyer's prepaid Pay Token via the LemonCake fiat gateway; you keep 97% |

Go live in ~5 minutes:

1. Create an endpoint + Seller Key in LemonCake /app.
2. LEMONCAKE_SELLER_KEY=sk_live_… in .env.
3. npm run smoke to verify the charge path, then npm start.

Buyers prepay by card and call with a spend-capped Pay Token. No crypto.

What you get

• A remote (Streamable HTTP) MCP server with a paid_search tool (mock results — swap for any real API).
• A working agent demo of the pay-per-call flow.
• Env-only go-live: sandbox to real billing without touching code.

LemonCake · MIT