Hi team,
We've been following 21st.dev's work — the Magic MCP is really impressive and the fact that you're already monetizing (£400+/mo as of last year based on public mentions) validates the whole paid-MCP-server thesis.
We noticed a few open issues about "Failed to create API key" — rolling your own auth and billing is one of the harder parts of a paid MCP product. We built MCP Billing Gateway to solve exactly that for our own server (FinData MCP).
It handles: Stripe subscriptions, API key management, usage tracking, and x402 micropayments for agent callers. Open-source SDK + self-hostable backend.
Not trying to sell you anything — just thought it might be worth a look if you're planning to scale the billing side. Happy to share how we integrated it.
https://github.com/sapph1re/mcp-billing-gateway-sdk
Hi team,
We've been following 21st.dev's work — the Magic MCP is really impressive and the fact that you're already monetizing (£400+/mo as of last year based on public mentions) validates the whole paid-MCP-server thesis.
We noticed a few open issues about "Failed to create API key" — rolling your own auth and billing is one of the harder parts of a paid MCP product. We built MCP Billing Gateway to solve exactly that for our own server (FinData MCP).
It handles: Stripe subscriptions, API key management, usage tracking, and x402 micropayments for agent callers. Open-source SDK + self-hostable backend.
Not trying to sell you anything — just thought it might be worth a look if you're planning to scale the billing side. Happy to share how we integrated it.
https://github.com/sapph1re/mcp-billing-gateway-sdk