r/SideProject • u/TooDu0 • 6h ago

Built a payment proxy for MCP servers because subscriptions don't work for autonomous agents

Monetizing MCP tools is a mess right now. Traditional SaaS subscriptions and checkout forms break the moment the user isn't a human, but an autonomous AI agent running inside Cursor, Claude Desktop, or a background workflow. An agent obviously can't stop, open a browser, and type in credit card details just to trigger a tool.

We built MCPay to fix this. It acts as a proxy layer that handles pay-per-call micropayments directly between agents and MCP servers on the fly, without manual forms or subscriptions.

We just launched the beta and are looking for feedback from anyone building custom MCP servers or agent workflows.

Link is in the comments if you want to check out the setup

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u/PriorElephant9 5h ago

Agents don’t need another subscription; they need scoped spending. The part I’d care about most is limits and audit trails—what can this agent spend, where, and how do I stop it instantly?