Introducing , a library that integrates with the AI SDK to bring paywalls to Model Context Protocol (MCP) servers to let agents discover and call pay for MCP tools easily and securely.x402-mcpx402 With x402-mcp, you can define MCP servers with that require payment to run, enabling account-less, low-latency, anonymous payments directly in AI workflows.

Payments confirm in ~100–200ms, with fees under $0.01 and support for minimums under $0.001.paidTools Getting started is easy, here's how you can define a paid tool: And integrating with AI SDK MCP Clients takes just one function to enable payments: Read more about or try our full stack .x402x402 AI Starter Kit Read more