What Are Agentic Payments? What Each Provider Actually Ships

Four of the biggest names in payments have announced agent checkout; one of them will let you turn it on today.

TL;DR

Mastercard announced Agent Pay on 29 April 2025. On 2 March 2026, describing its own first live European transaction with Santander, it wrote that the pilot "does not constitute a commercial rollout at this stage." Same company, same product, ten months apart.
Visa's Intelligent Commerce product page still carries the footnote "Product is currently in the process of deployment." Intelligent Commerce Connect, the part a merchant would integrate, was described on 8 April 2026 as "Currently in pilot with select partners."
Stripe is the exception: onboarding is self-serve in the Dashboard, across 34 countries, with Kate Spade, Best Buy and Coach named as "already building with" it (29 April 2026). It still runs on preview API versions and preview legal terms.
PayPal announced in October 2025 that it would power checkout in ChatGPT, but the integration was still described as "rolling out" when OpenAI pulled back from standalone Instant Checkout in March 2026. Its Agent Ready documentation, updated 13 October 2026, now describes integrations for ChatGPT Apps via Braintree and for Google AI Mode and Gemini via UCP.
Verifying the agent is further along than paying it. Visa's Trusted Agent Protocol specification has been published since 14 October 2025 and a merchant can implement it today, while Visa's own payment rail remains pilot-gated.

What are agentic payments?

An agentic payment is a transaction an AI agent completes on your behalf, inside the assistant, rather than handing you off to a checkout page to finish yourself. How that sits inside the wider shopping flow – discovery, shortlist, then payment – is covered in What Is Agentic Commerce?.

In an agentic payment the agent never holds the card number: a payment provider mints a token, which Stripe calls a Shared Payment Token, that works once, at one merchant, for one cart total, and the store charges it through its normal processor. The store stays the merchant of record, as OpenAI states for ACP and Google states for its Universal Cart.

The mechanism that makes this different from a saved card is scoping. The agent never holds your card number. A payment provider mints a token that works once, at one merchant, for one cart total, and the merchant charges that token through its normal processor. Stripe calls its version a Shared Payment Token – "a new payment primitive that lets applications like ChatGPT initiate a payment" – and states plainly that "SPTs are scoped to a specific merchant and cart total."

The money still lands in your systems, under your terms. OpenAI's own developer documentation is explicit that "OpenAI is not the merchant of record in the Agentic Commerce Protocol," and Google says the same of its Universal Cart: "the brand stays the merchant of record."

ACP, UCP, AP2, x402 – which is which

Within a year this category has produced four protocols with similar names, and they are routinely treated as competitors when three of them do different jobs.

Name	Who owns it	What it governs	What it means for a store
ACP – Agentic Commerce Protocol	Launched by OpenAI and Stripe in September 2025; the repository names them Founding Maintainers, and lists Meta as a lead maintainer from April 2026	The whole agent-to-merchant checkout exchange	Reaches ChatGPT. You build a feed and checkout endpoints
UCP – Universal Commerce Protocol	Google	The broader shopping journey, not only payment	Reaches AI Mode in Search and the Gemini app. Built on your Merchant Center feed
AP2 – Agent Payments Protocol	Google, donated to the FIDO Alliance on 28 April 2026	Securing the payment itself	Nothing standalone – Google describes it as "a specialized payment layer within UCP"
x402	Contributed by Coinbase, governed by the Linux Foundation since 14 July 2026	Payments over HTTP, stablecoins first	Its own documentation describes API monetization and paywalled content, not consumer retail checkout

Two of these are worth separating properly. AP2 is not a rival to UCP – Google's own UCP FAQ says "AP2 can be used as a specialized payment layer within UCP," and the AP2 spec describes itself as something that "operates as a security feature within a Commerce Protocol." Google said in September 2025 that it was "collaborating with… more than 60 organizations" on AP2, and when it handed the protocol to the FIDO Alliance in April 2026 it described the move as keeping AP2 "platform-agnostic and community-led."

AP2 has also moved fast enough to invalidate a lot of what is written about it. Version 0.2, released in April 2026, replaced the original Intent and Cart Mandates with Checkout and Payment Mandates, each with an open and a closed variant. Anything describing three mandates is describing v0.1.

The one framing to avoid is a protocol war. ACP's and UCP's docs don't reference each other, and their owners haven't framed them as rivals. Stripe and Meta take part in both.

What each provider has actually shipped

This is where the gap between press release and production sits. For the platforms that measure whether you make the shortlist before any of these rails matter, see The Best Agentic Commerce Optimization Platforms in 2026.

Provider	Status today	What a merchant can do
Stripe	Self-serve, 34 countries, on preview API and preview terms	Turn it on from the Dashboard
PayPal	Store Sync live in US and UK; Agent Ready docs updated 13 Oct 2026	Feed discovery on Copilot and Perplexity; Agent Ready paths for ChatGPT Apps and UCP
Visa	"In the process of deployment"; merchant integration in pilot	Implement Trusted Agent Protocol; wait for the rest
Mastercard	Pilots and Early Access; no merchant general availability stated	Apply to a pilot programme

Stripe is the only one of the four we could confirm a store can switch on unaided. Its docs tell you to "Go to the Agentic commerce page in the Dashboard and select Get started" – a change from the launch in December 2025, when the instruction was "If you're interested in using the Agentic Commerce Suite, join the waitlist." It covers 34 countries including Slovakia and the Czech Republic. The caveats are real but narrow: every live code sample runs on a preview API version, the seller terms are a named preview, and distribution is not yours to control – "Stripe sends the agent an approval request that the agent must accept."

PayPal's story is one of slippage rather than withdrawal. Its joint release with OpenAI on 28 October 2025 was written in the future tense throughout. Its March 2026 consumer page still said the feature was "currently rolling out and may not be available to all users yet." Then, on 24 March 2026, OpenAI deprioritised standalone Instant Checkout, writing that it is "allowing merchants to use their own checkout experiences while we focus our efforts on product discovery." PayPal has kept building through it: its Agent Ready documentation, updated 13 October 2026, describes instant checkout in ChatGPT Apps using delegated payment tokens through Braintree, and a Buy button in Google AI Mode and Gemini through UCP. Store Sync is live separately – "Available in the US and UK today, with Germany and additional markets on the way" – with Abercrombie & Fitch, Fabletics, Ashley Furniture, Newegg and Adorama named on Microsoft Copilot and Perplexity as of 22 January 2026. We could not establish whether Agent Ready onboards self-serve.

Visa announced Intelligent Commerce on 30 April 2025 as something that "opens Visa's payment network to the developers and engineers building the foundational AI agents." Eighteen months on, its developer page says "This product is in the process of development and deployment" and "May not be available in all markets," with the sandbox free and production priced on request. In December 2025 Visa reported "hundreds of controlled, real-world agent-initiated transactions." Its newest milestone, announced on 20 October 2026 with BILL and Billtrust, is "the first live pilot to enable trusted AI agents to initiate and complete approved buyer invoice payments" – and it is B2B invoice payment, not retail checkout.

Mastercard has the sharpest announced-versus-live gap of the four, in its own words. In April 2025 it "announced the launch of its Agentic Payments Program." In March 2026, reporting a real transaction through Santander's live infrastructure, it specified that this happened "in a controlled environment" and "does not constitute a commercial rollout at this stage." Agent Pay for Machines opened Early Access on 20 October 2026 – "we're making the first version of our buyer- and seller-side APIs available to developers" – but the sign-up page it points to says the programme is "still in a pilot and not available commercially." Mastercard has published a date for the consumer side – all US Mastercard cardholders enabled by the 2025 holiday season – but no general-availability date for merchants.

How the agent gets verified, and who carries the risk

The question merchants ask before "how do I take the money" is "how do I know this isn't a bot." That part is further along than the payment rails.

Visa's Trusted Agent Protocol has been published since 14 October 2025. Visa's developer documentation describes it as "a verifiable, cryptographic standard to help merchants differentiate legitimate agents from nefarious bots or web crawlers," and the merchant's job is small and well defined: "A merchant's primary task is to validate this signature." Two limits are worth knowing: Visa states that the "initial specifications apply to the Visa network in this phase," and the developer page still carries the same "in the process of development and deployment" disclaimer as the rest of Intelligent Commerce.

This is the asymmetry worth noticing. The identity layer is published; the payment layer is piloting. A store can start distinguishing real agents from scrapers against a published spec, while the rails that would let those agents pay are still gated behind partner programmes at three of the four providers.

What a store actually has to do today

Strip out the announcements and the merchant to-do list is short, and it is not really about payments.

For ACP, OpenAI's documentation lists three things: a product feed, checkout endpoints, and a payment provider that mints the token. For UCP, Google reuses what you already have – your Merchant Center feed – plus a payment handler and a specific product attribute, native_commerce(checkout_eligibility), without which the Buy button does not appear.

Both routes are narrower than they look. Stripe's agent-side tools, for AI platforms building agents rather than for stores, are still a private preview with a waitlist, and Google's UCP checkout is early access for select merchants – so "integrate UCP" today means "apply, then integrate".

The part that catches people is the feed, not the integration. Stripe's own guidance is that "uploading inventory and pricing data every 15 minutes is enough," followed by a blunt warning: "Price mismatches … cause checkouts to fail." Which fields that feed must carry, and how to structure them so an agent can match your SKUs, is in How to structure product data so AI search can recommend you.

Read that twice. The most common reason an agentic checkout breaks is not your payment setup. It is stale product data.

The most common reason an agentic checkout fails is stale product data, not the payment setup: Stripe says uploading inventory and pricing data every 15 minutes is enough in most cases, and warns that price mismatches cause checkouts to fail.

What this changes for AI visibility

Every protocol on this page starts at the same moment: the agent has already chosen your product. ACP's flow begins with a cart. UCP's Buy button appears against a listing that was already surfaced. Shared Payment Tokens are scoped to a merchant and a cart total that something upstream decided.

None of them help you get into the shortlist. They only help you collect once you are in it.

That upstream step is live right now in a way the payment rails are not. Meta's Muse agent has been shopping on Stripe Link since 8 September 2026. At the "more than 1 million businesses that accept Link," Muse checks out instantly with a saved Link payment method; for other businesses, Link issues "a single-use virtual card scoped to the approved purchase." Grok Bot and Instinct run on the same wallet. How Muse builds that shortlist – and what it takes to get into it – is in Meta Muse Explained. The shortlisting is already happening across these surfaces whether or not your checkout is agent-ready.

The practical reading is Stripe's, not ours: if a price mismatch fails a checkout, then product data quality is a payments problem before it is ever a marketing one.

What to do next

Implement Visa's Trusted Agent Protocol. It is published, the merchant task is signature validation, and it does not depend on any rail reaching general availability.
Fix feed freshness before integrating anything. Stripe's threshold is a 15-minute refresh on inventory and price. If you cannot hit that, agentic checkout will fail in ways that look like payment bugs.
If you want agent checkout this quarter, Stripe is the only self-serve route we could confirm – and go in knowing the API and terms are previews, and that each agent approves you separately.
Treat Visa's and Mastercard's programmes as roadmap, not procurement. Neither publishes a general-availability date for merchants, and both route merchants through partner programmes. Mastercard's holiday-season 2025 date covered cardholder enablement, not merchant availability.
Audit whether agents are recommending your products at all, because every rail here assumes that step already happened.

How we verified this

Every claim on this page was checked against the company's own documentation, newsroom or specification repository on 22 October 2026. Where a vendor's own pages disagreed, we said so rather than picking one: Stripe's docs describe ACP as "created by Stripe, OpenAI, and Meta," the specification site says "Stripe and OpenAI developed" it, and the repository names those two as Founding Maintainers while listing Meta as a lead maintainer from April 2026. We could not establish merchant general-availability dates for Visa Intelligent Commerce or Mastercard Agent Pay, because neither company publishes one, and we have not listed live markets for either for the same reason. We also could not establish whether PayPal's Agent Ready onboards self-serve. Every figure and quote on this page comes from a source a reader can open; we have deliberately not used first-party Ranketta data here, so nothing on this page rests on a number only we can see.

Frequently Asked Questions

Agentic payments are transactions an AI agent completes on a shopper's behalf inside an assistant such as ChatGPT, Google's AI Mode or Meta's Muse, rather than redirecting the shopper to a checkout page. The agent does not hold card details: a payment provider issues a token scoped to one merchant and one cart total, which the merchant charges through its normal processor. The merchant remains the merchant of record.

As of 22 October 2026, Stripe is the only one of the four major providers we could confirm a merchant can enable without a partner agreement: its Agentic Commerce Suite is self-serve from the Stripe Dashboard across 34 countries, though on preview API versions and preview legal terms. Visa's Intelligent Commerce product page states it is "in the process of deployment." Mastercard stated in March 2026 that its Agent Pay pilot "does not constitute a commercial rollout at this stage." PayPal's ChatGPT checkout was still described as "rolling out" when OpenAI deprioritised standalone Instant Checkout in March 2026.

ACP, the Agentic Commerce Protocol, was launched by OpenAI and Stripe in September 2025 and governs agent-to-merchant checkout; it reaches ChatGPT. UCP, Google's Universal Commerce Protocol, covers the broader shopping journey and reaches AI Mode in Search and the Gemini app. AP2, the Agent Payments Protocol, is not a competitor to either: Google describes it as "a specialized payment layer within UCP," and donated it to the FIDO Alliance on 28 April 2026.

PayPal announced in October 2025 that it would power checkout in ChatGPT, but the integration was still described as "rolling out" when OpenAI pulled back from standalone Instant Checkout in March 2026. PayPal's Agent Ready documentation, updated 13 October 2026, describes instant checkout in ChatGPT Apps using delegated payment tokens through Braintree, and a Buy button in Google AI Mode and Gemini through UCP. Separately, Store Sync is live in the US and UK, powering discovery on Microsoft Copilot and Perplexity.

The main published mechanism is agent identity verification rather than transaction scoring. Visa's Trusted Agent Protocol, published on 14 October 2025, is described in Visa's developer documentation as "a verifiable, cryptographic standard to help merchants differentiate legitimate agents from nefarious bots or web crawlers," and the merchant's task is to validate a cryptographic signature. Visa notes its "initial specifications apply to the Visa network in this phase." Payment tokens add a second limit: a Shared Payment Token is scoped to one merchant and one cart total, and Stripe states "You can only resolve an SPT one time."

As of 22 October 2026 the fastest route is Stripe's Agentic Commerce Suite, which onboards self-serve from the Stripe Dashboard across 34 countries. Before integrating, check feed freshness: Stripe advises that "uploading inventory and pricing data every 15 minutes is enough" and warns that "Price mismatches … cause checkouts to fail." Visa's Trusted Agent Protocol can be implemented independently of any payment rail, since the merchant's task is signature validation.

OpenAI's developer documentation lists three requirements: a regularly refreshed product feed in CSV or JSON, checkout endpoints the agent can call to create and update a checkout session, and a payment provider that mints a payment token. OpenAI states that it "is not the merchant of record in the Agentic Commerce Protocol" and that merchants "are expected to bring their own PSP and handle payments."

Sources

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Agentic Payments: What Stripe, PayPal, Visa and Mastercard Have Actually Shipped