Show and tell: MCP Billing Gateway — add Stripe + x402 billing to any FastMCP server

[sapph1re]

Hi FastMCP community,

FastMCP makes it very easy to build MCP servers — but one gap we kept hitting was: how do you add billing once you're ready to monetize?

We built MCP Billing Gateway for our own FastMCP-based servers and wanted to share it here. It's a companion billing layer that works alongside FastMCP:

• Stripe subscriptions for human users (free/pro/enterprise tiers)
• x402 micropayments for agent-to-agent calls
• Per-server usage tracking and tier enforcement
• Drop-in middleware: register your server, then gate tool calls with a single API check

We're dogfooding it on FinData MCP and MCP Billing Gateway itself. Open-source under MIT.

Sharing in case others here are hitting the same wall when they're ready to go from free to paid.

https://github.com/sapph1re/mcp-billing-gateway-sdk