---
title: "Machine Payments Protocol (MPP), defined | Agent Ready Checkout"
description: "Machine Payments Protocol (MPP): An HTTP 402 protocol co-authored by Tempo and Stripe with one-time, session and subscription intents across stablecoins."
canonical: https://agentreadycheckout.com/glossary/machine-payments-protocol-mpp
site: "Agent Ready Checkout"
last_updated: 2026-11-04
section: "Glossary"
---

# Machine Payments Protocol (MPP), defined | Agent Ready Checkout

> Machine Payments Protocol (MPP): An HTTP 402 protocol co-authored by Tempo and Stripe with one-time, session and subscription intents across stablecoins.

Source: https://agentreadycheckout.com/glossary/machine-payments-protocol-mpp
Site: Agent Ready Checkout
Last reviewed: 2026-11-04

Glossary

# Machine Payments Protocol (MPP)

In short

Machine Payments Protocol (MPP): An HTTP 402 protocol co-authored by Tempo and Stripe with one-time, session and subscription intents across stablecoins, cards and Lightning. Machine Payments Protocol (MPP) appears in 14 sourced facts on this site, the first in Visa Trusted Agent Protocol (TAP). Example: Stripe accepts MPP with cards via SPT and USDC on Tempo and Solana.

## Definition

An HTTP 402 protocol co-authored by Tempo and Stripe with one-time, session and subscription intents across stablecoins, cards and Lightning.

## Example

Stripe accepts MPP with cards via SPT and USDC on Tempo and Solana. [docs.stripe.com](https://docs.stripe.com/payments/machine.md), read 4 Nov 2026.

## Where it appears in the sourced facts

-   Visa Intelligent Commerce Connect accepts TAP alongside MPP, ACP and UCP, in pilot since April 2026. [visa.co.uk](https://www.visa.co.uk/about-visa/newsroom/press-releases.3442048.html), read 4 Nov 2026. In [Visa Trusted Agent Protocol (TAP)](https://agentreadycheckout.com/protocols/visa-trusted-agent-protocol).
-   Intelligent Commerce Connect accepts agent-initiated payments over TAP, MPP, ACP and UCP and is "currently in pilot with select partners": AWS, Diddo, Highnote, Mesh, Payabli and Sumvin. [visa.co.uk](https://www.visa.co.uk/about-visa/newsroom/press-releases.3442048.html), read 4 Nov 2026. In [Visa Intelligent Commerce (incl. Intelligent Commerce Connect)](https://agentreadycheckout.com/protocols/visa-intelligent-commerce).
-   The June release cites open standards like x402 and "Machine Payments Protocol compatibility". [mastercard.com](https://www.mastercard.com/us/en/news-and-trends/press/2026/june/mastercard-launches-agent-pay-for-machines.html), read 4 Nov 2026. In [Mastercard Agent Pay for Machines (AP4M)](https://agentreadycheckout.com/protocols/agent-pay-for-machines).
-   mpp.dev says MPP is "co-authored by Tempo and Stripe" and standardises HTTP 402 with Challenges, Credentials and a Payment-Receipt header. [mpp.dev](https://mpp.dev/), read 4 Nov 2026. In [Machine Payments Protocol (MPP)](https://agentreadycheckout.com/protocols/mpp).
-   MPP intents are charge (one-time), session (metered) and subscription (recurring); transports map to HTTP headers, JSON-RPC (MCP) and WebSocket. [mpp.dev](https://mpp.dev/), read 4 Nov 2026. In [Machine Payments Protocol (MPP)](https://agentreadycheckout.com/protocols/mpp).

## Nearby terms

-   [Shared Payment Token (SPT)](https://agentreadycheckout.com/glossary/shared-payment-token-spt)
-   [Delegated payment](https://agentreadycheckout.com/glossary/delegated-payment)
-   [Facilitator](https://agentreadycheckout.com/glossary/facilitator)
-   [All terms](https://agentreadycheckout.com/glossary)

## Sources

1.  [docs.stripe.com/payments/machine.md](https://docs.stripe.com/payments/machine.md), read 4 Nov 2026
2.  [Visa opens the door to AI-driven shopping (Intelligent Commerce Connect)](https://www.visa.co.uk/about-visa/newsroom/press-releases.3442048.html), read 4 Nov 2026
3.  [Mastercard launches Agent Pay for Machines](https://www.mastercard.com/us/en/news-and-trends/press/2026/june/mastercard-launches-agent-pay-for-machines.html), read 4 Nov 2026
4.  [Machine Payments Protocol](https://mpp.dev/), read 4 Nov 2026

Last reviewed 4 Nov 2026

## Edition

Matrix edition of 4 Nov 2026.

Reviewed 4 Nov 2026, [4 sources](#sources-h).

## Method

[How cells, sources and read dates are defined](https://agentreadycheckout.com/method)