Stripe launches Machine Payments Protocol to enable AI agents to transact autonomously

Stripe and Tempo Launch Machine Payments Protocol for Autonomous Transactions

On March 18, 2026, Stripe and Tempo launched the Machine Payments Protocol (MPP) alongside the Tempo mainnet, marking what Forrester analysts describe as a structural turning point for micropayments 1

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. The open-source protocol enables AI agents to send and receive money autonomously, supporting payments in both fiat and cryptocurrency 2

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. Tempo, a blockchain startup incubated by Stripe and venture firm Paradigm, raised $500 million at a $5 billion valuation in 2025 from investors including Joshua Kushner's Thrive Capital 2

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. The protocol is compatible with Stripe's existing AI payments infrastructure and designed to operate across multiple blockchains and payment rails, not just one 2

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Why Three Decades of Micropayments Failed Before AI Agents

Micropayments have struggled for thirty years because the paying entity was human, according to Forrester senior analyst Meng Liu 1

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. Human behavior created insurmountable barriers: people hesitate before small transactions, abandon carts, and perform mental accounting that adds friction 1

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. Machine-initiated payments invert that assumption entirely. They are designed for non-human actors such as AI agents, automated workflows, and software services that need to pay for resources like data access, compute, APIs, or digital services in real time 1

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. Payment becomes a programmatic step, not a conscious decision, eliminating checkout moments, cart abandonment risk, and mental transaction costs 5

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How Machine Payments Protocol Enables Agentic Payments

MPP provides a standard way for agents and services to coordinate payments programmatically . Instead of each service inventing its own billing flow, MPP defines a simple protocol for requesting, authorizing, and settling payments between machines 3

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. An agent can request a resource from a service, and the service responds with a payment request. The agent then authorizes payment from its wallet, the transaction settles instantly, and the service delivers the requested resource 3

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. This functionality is possible thanks to "sessions," which allow a stream of payments to be made programmatically based on existing, defined limits 3

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. Tempo has released a directory of compatible services with which agents can interact and pay for, including those from OpenAI, Anthropic, and Google 3

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Visa and Industry Partners Extend the Open Standard

The open standard has already been enhanced by early launch partners, including global payments giant Visa, which extended MPP to support card-based payments, and Lightspark, which added support for Bitcoin payments on the Lightning Network 3

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. Stripe added functionality for cards, wallets, and other payment methods 3

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. Cuy Sheffield, Visa's head of crypto, told Fortune that "we look at MPP as another way that you can have a very clear, defined protocol around how an agent communicates with merchants" 2

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. The protocol is designed to work across existing infrastructure, including traditional card rails, digital wallets, and where supported, crypto rails 5

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Competing Protocols Emerge as Agentic Economy Takes Shape

Agentic payments has become the newest buzzphrase in fintech, referring to when AI agents or autonomous bots send and receive money on behalf of their human users 2

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. The protocol Tempo designed with Stripe isn't the only existing framework for agentic payments. Coinbase has designed its own network dubbed x402, a callback to a message encoded by early internet pioneers that returned a 402 or "Payment Required" error, which activates HTTP 402 for instant USDC payments directly over HTTP with zero protocol fees and sub-2-second settlement 1

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. Google released a new payments scheme in September that includes support for credit cards as well as stablecoins 2

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. Two ex-Stripe engineers founded Circuit & Chisel, which introduced Agent Transaction Protocol (ATXP) to help AI agents navigate the web and execute payments as part of multi-step task completion 1

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Tempo Blockchain Designed for High-Speed Payments and Stablecoins

Tempo, the payments-focused layer-1 blockchain from Stripe and Paradigm, launched its mainnet on Wednesday after operating in a test phase over the past three-and-a-half months 2

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. The startup's blockchain is designed for high-speed payments and stablecoins, or cryptocurrencies pegged to real-world assets like the U.S. dollar . In November, Swedish fintech giant Klarna became the first bank to launch a stablecoin on Tempo called 'KlarnaUSD', expected to help cut down on transaction fees and move large amounts of money globally by cutting out parties such as the SWIFT network 4

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. Matt Huang, cofounder of Tempo and managing partner at Paradigm, told Fortune that "agentic payments is very early, and we still are figuring out the best way to structure these" 2

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What This Means for Enterprise Adoption and AI-Driven Payment Solutions

Initial demand is coming from enterprise and developer environments, not consumer content, according to Forrester 1

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. Companies such as browser infrastructure provider Browserbase and New York City-based Prospect Butcher already use MPP to allow agentic commerce 4

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. McKinsey found that by 2030, agentic commerce could orchestrate up to $5 trillion globally, though Morgan Stanley noted that only 1 percent of shoppers currently choose the agentic route 4

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. Stripe acquired US billing and invoice software provider Metronome in December, which enables organizations to create and manage user-based pricing models that CEO Patrick Collison described as "the native business model for the AI era" 4

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. Analysts at Bernstein believe AI agents could boost demand for stablecoins, as they are well-suited for handling frequent, low-value machine-to-machine transactions 5

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