MCP Billing Gateway lets developers monetize AI tool servers without writing billing code

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A new open-source tool called MCP Billing Gateway allows developers to add monetization to their Model Context Protocol (MCP) servers without modifying any existing code. The gateway works as a reverse proxy, sitting in front of an MCP server and handling Stripe subscriptions, per-call credits, and cryptocurrency payments via the x402 standard. Callers without sufficient credits receive a 402 Payment Required response before the underlying server is even reached, keeping billing logic entirely separate. Developers typically spend two to four weeks building billing infrastructure from scratch, and the gateway aims to eliminate that overhead entirely. The project targets AI tool builders who are currently absorbing compute and API costs without a straightforward way to charge users.

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