Stripe Launches Machine Payments Protocol (MPP): An Open Standard for Agents to Pay Each Other

Stripe, co-authored with Tempo, has launched the Machine Payments Protocol (MPP) — an open, internet-native standard for AI agents to make autonomous payments to businesses and each other.

The Problem

AI agents are evolving from chatbots to autonomous actors that plan, execute, and evaluate outcomes. But today's financial infrastructure was built for humans. For an agent to make a purchase, it typically needs to:

• Create an account
• Navigate a pricing page
• Choose between subscription tiers
• Enter payment details
• Set up billing

Most of these steps require human intervention, which defeats the purpose of an autonomous agent.

How MPP Works

The protocol is straightforward:

1. An agent requests a resource from a service, API, MCP endpoint, or any HTTP-addressable endpoint
2. The service responds with a payment request
3. The agent authorizes the payment
4. The resource is delivered

For Stripe businesses, payments appear in the Dashboard like any other transaction — same fraud protection, tax calculation, reporting, and refunds.

Integration

Stripe users can accept MPP payments in a few lines of code using the PaymentIntents API. Businesses can accept payments in:

• Stablecoins
• Fiat via cards
• Buy now, pay later via Shared Payment Tokens (SPTs)

Early Adopters

MPP is already powering real agentic businesses:

• Browserbase — agents spin up headless browsers, pay per session
• PostalForm — agents pay to print and send physical mail
• Prospect Butcher Co. — agents order sandwiches for human pickup or NYC delivery
• Stripe Climate — agents can programmatically contribute to carbon removal
• Parallel Web Systems — agents pay per API call for web access

"Parallel is built for a world where agents are the primary users of the web. We integrated machine payments with Stripe in just a few lines of code." — Parag Agrawal, founder of Parallel Web Systems

Part of a Larger Suite

MPP joins Stripe's growing agentic commerce infrastructure:

• Agentic Commerce Suite — unified toolkit for agent commerce
• Agentic Commerce Protocol (ACP) — broader commerce standard
• MCP integrations — Model Context Protocol support
• x402 support — HTTP 402 Payment Required standard

Why It Matters

This represents a fundamental shift: agents are becoming a new category of economic actors. MPP provides the payment rails for an emerging agent economy where machines buy services from machines, potentially at massive scale with microtransactions that were never practical with human-oriented payment flows.

Source: Stripe Blog | MPP Spec | Stripe Docs | HN Discussion