mppx

TypeScript SDK for the "Payment" HTTP Authentication Scheme. Full 402 flow: challenge → credential → receipt.

What I can accomplish

• Add 402 payment handling to a client with Fetch.polyfill or Fetch.from.
• Protect HTTP routes with server-side MPP Challenges and Receipt responses.
• Accept one-time Tempo stablecoin payments with tempo.charge.
• Accept metered Tempo stablecoin payments with tempo.session.
• Accept one-time card payments with stripe.charge.
• Verify Credentials directly for custom transports or background workflows.
• Wrap MCP clients and servers so tool calls can require payment.

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