MCP Keeper

MCP Keeper is a hosted proxy that sits between AI agents and an MCP server, allowing server authors to charge per‑tool calls without writing any payment handling code. After registering a server, the proxy creates a new endpoint that can be introduced gradually to a test group, then swapped in as the default public address once the pricing model is verified. Each tool can be assigned a per‑call price, ranging from micro‑transactions to higher fees, while free tools remain unrestricted.

The service uses the open HTTP 402 (x402) protocol to collect stablecoin payments, automatically metering usage and forwarding requests to the underlying server. A web dashboard provides analytics on call volume, revenue, and rate‑limit settings, and it supports daily USDC payouts to a Base wallet after a minimum threshold is met. Tools listed through the proxy are also published in the Bazaar marketplace, enabling agents to discover and connect to paid functionalities.

MCP Keeper is intended for developers who publish MCP tools and want a turnkey solution for monetization, offering drop‑in integration, built‑in rate limiting, and transparent payment processing without requiring changes to existing server code.