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Showing content from https://github.com/blustAI/python-paymcp-server-demo below:

blustAI/python-paymcp-server-demo: Minimal MCP server demo with paymcp (Stripe/Walleot) that generates images via OpenAI.

A minimal Model Context Protocol (MCP) server in Python that exposes a paid tool generate via paymcp. It calls OpenAI (dall-e-2), converts the output to base64, resizes it to 100×100, and returns it as an MCP image resource.

• Python 3.10+
• OpenAI: OPENAI_API_KEY
• Payments (choose one provider):
  • Walleot: WALLEOT_API_KEY
  • Stripe: STRIPE_SECRET_KEY
    Note: Stripe enforces a minimum charge; set your tool price accordingly (e.g., higher than their minimum) if you use Stripe.

The price is configured in code via @price(0.2, "USD") in server.py.

This starts the server and launches MCP Inspector automatically; connect and call the generate tool with a prompt.

Check the console for the /mcp URL and connect from your MCP client (or run Inspector separately e.g. with npx @modelcontextprotocol/inspector@latest).

To install for MCP clients (e.g., Claude Desktop):

uv run mcp install server.py \
  --with openai --with paymcp --with requests --with Pillow

Set env vars before running:

export OPENAI_API_KEY="sk-..."
# choose one payment provider
export WALLEOT_API_KEY="..."        # for Walleot
# or
export STRIPE_SECRET_KEY="sk_live_..."  # for Stripe (remember the minimum charge)

This demo intentionally returns a small image (100×100) to make testing in Claude easier. Claude Desktop (and other MCP clients) has practical limits on message size; keeping the base64 payload compact makes requests/responses fast and reliable during development.

MIT

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