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mpp

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Elixir implementation of the Machine Payments Protocol (MPP) — HTTP 402 payment middleware for AI agents and machine-to-machine commerce. Supports Stripe, Tempo, and generic EVM payment methods with pluggable architecture.

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mpp lib mpp.ex
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lib/mpp.ex 

defmodule MPP do

  @moduledoc """

  Elixir implementation of the [Machine Payments Protocol](https://mpp.dev) (MPP).



  MPP enables machine-to-machine payments via HTTP 402. This library provides

  Plug middleware that adds pay-per-call billing to any Phoenix or Plug application.



  ## How it works



  1. Client requests a protected resource

  2. Server responds with `402 Payment Required` and a payment challenge

  3. Client fulfills payment (Stripe, stablecoins, or on-chain)

  4. Client retries with payment credential in `Authorization: Payment` header

  5. Server verifies payment and returns the resource with a `Payment-Receipt` header



  No user accounts. No API keys. No signup flow. Payment is authentication.



  ## Protocol



  Built on the [MPP specification](https://github.com/tempoxyz/mpp-specs) —

  an IETF draft co-developed by Stripe and Tempo Labs. Also supports

  [x402](https://docs.x402.org) for on-chain payments.



  ## Status



  Early development. Payment method implementations coming soon.

  """

end