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x402-mcp: Open protocol for mcp payments

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Came across this post on X, where Vercel launched x402 which helps you build paid MCP tools, as you can try out in the demo here. It's explained as:

x402 is an open protocol that addresses this by adding payment directly into HTTP requests. It uses the 402 Payment Required status code to let any API endpoint request payment without prior account setup.

They have also created a starter which you can use to quickly build paid MCP tools.

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