# Mpp

> Support MPP machine payments

- Skill: `whiteknightonhorse/mpp` (Agent Skill)
- Install (CLI): `npx skillmds@latest add whiteknightonhorse/mpp`
- Raw SKILL.md: https://api.skillmd.com/api/skills/whiteknightonhorse/mpp/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: whiteknightonhorse (https://skillmd.com/u/whiteknightonhorse)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/whiteknightonhorse/mpp

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# Support MPP machine payments

> AIPUSH agent skill · Category: Commerce · Slug: `mpp`

The Machine Payment Protocol advertises payable operations in your OpenAPI so agents can discover prices and transact programmatically.

## Why it matters

The Machine Payment Protocol advertises payable operations in your OpenAPI so agents can discover prices and transact programmatically.

## How to detect

`/openapi.json` includes `x-payment` info on payable operations.

## How to implement

Annotate payable operations in your OpenAPI document with `x-payment-info` and add MPP middleware (mppx for TypeScript, pympp for Python):

```json
{
  "paths": { "/api/generate": { "post": {
    "x-payment-info": { "intent": "charge", "method": "card", "amount": 100, "currency": "USD" }
  }}}
}
```

## How to verify

`curl -s https://YOURDOMAIN/openapi.json | jq '.. | ."x-payment-info"? // empty'` returns your entries.

## References

- https://mpp.dev/
- https://paymentauth.org/

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