MPP (Machine Payments Protocol)

Last updated Aug 5, 2026 is an open protocol for machine-to-machine payments. It standardizes the HTTP 402 Payment Required status code with a formal authentication scheme proposed to the IETF ↗︎. MPP gives agents, applications, and people one interface to pay for a service in the same HTTP request.

MPP is payment-method agnostic. It supports stablecoins, cards through Stripe, and custom payment methods. A service can offer more than one method.

How it works

  1. An Agent or HTTP client requests a paid resource.
  2. The service returns 402 Payment Required with a payment Challenge.
  3. The client fulfills the payment.
  4. The client retries with a payment Credential.
  5. The service returns the resource with a payment Receipt.

HTTP services exchange payment data in authentication headers. Model Context Protocol (MCP) tools use the same flow through JSON-RPC.

Payment intents

MPP defines three payment intents:

  • charge — Collect a one-time payment.
  • session — Charge for measured usage.
  • subscription — Sell recurring access.

For more information, refer to MPP payment intents ↗︎.

Compatibility with x402

MPP is backwards-compatible with x402. MPP clients can consume existing x402 services without changes to those services.

Build on Cloudflare

Accept payments

Charge for a Worker route or an MCP tool

Pay from the Agents SDK

Pay HTTP services and MCP tools from a Cloudflare Agent

SDKs

MPP provides SDKs for TypeScript, Python, Rust, Go, and Ruby. The Cloudflare guides use the TypeScript mppx SDK ↗︎.

For current packages and integrations, refer to the MPP SDK documentation ↗︎.

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