Mastercard opened early access to Agent Pay for Machines on Tuesday 20 October, handing developers its first buyer-side and seller-side APIs after a pilot in which one AI agent made nine payments to two online services on a single budget. The test ran on x402, a payment protocol incubated by Coinbase, with Base as the onchain settlement network and BVNK, the stablecoin firm Mastercard bought this year, as the agent’s wallet, The Block reported. The product is still a pilot and is not commercially available.
Mastercard published a press release on its newsroom, but its site refused our requests, as it has for earlier Mastercard releases. The facts below come from four outlets that carried the announcement and agree on the details: The Block, Bitcoin.com News, PYMNTS (which quotes the release) and the Italian site Cryptonomist.
The scale matters as much as the names. Nine payments, two merchants, one marketing agency, no disclosed amount. Mastercard has moved its machine-payment product from a June announcement to a working demo and a developer sandbox; it has not yet moved it into commerce.
What Mastercard Agent Pay for Machines early access includes
Developers who join get the buyer-side and seller-side APIs, a toolkit, sandbox environments and documentation, according to Cryptonomist and Bitcoin.com News. A buyer-side API is what an agent uses to pay; a seller-side API is what a service uses to ask for payment and check it. Mastercard asks developers to test agent-to-agent commerce and tell it which features they need, and says customer and partner feedback will shape the roadmap before any wider rollout.
No price, fee schedule or launch date was given. None of the four outlets names a country or region where the product will be offered first, and none says how many developers have access.
In a statement to The Block, Mastercard framed the problem in two short lines: “Now AI agents need a way to pay for them,” followed by “That’s what we’re building.”
The Cloudflare Connect demo: nine payments, two merchants, one budget
The demo was built around Hype, a marketing agency, and tied to Cloudflare Connect, Cloudflare’s customer event held the same week: PYMNTS says Mastercard planned to present it there, Bitcoin.com News describes it as shown. Hype gave an AI agent a task, preparing a campaign for the launch of a protein bar, and a budget. The agent used a Mastercard tool called the Discovery Service to find registered providers and drafted a plan, which Hype approved before any money was spent, PYMNTS reported.
The agent then bought one social media research report from AIsa and generated eight campaign images through Cloudflare AI Gateway. That is nine payments to two independent merchants. It did so without opening an account with either provider, without API keys and without invoices, PYMNTS and Cryptonomist report.
“The agent paid only for what it used, while Hype stayed in control,” Mastercard wrote in the release, as quoted by PYMNTS. The release also describes the usual hurdle: most paid digital services expect an account, an API key, prepaid credits or a billing relationship with each provider, which works for one or two services and becomes awkward when an agent has to choose between many.
No outlet gives the value of the nine payments, the price of an image or of the research report, or the date on which the pilot actually ran. Cryptonomist adds that Mastercard said the same flow can run on agent platforms such as Amazon Bedrock AgentCore; it did not say whether that was tested.
How x402 payment vouchers work
x402 takes its name from the HTTP status code 402, “Payment Required”, a web response for content that must be paid for. Coinbase incubated the protocol so that websites, APIs and AI agents can ask for and receive payment over both blockchain and traditional rails, Cryptonomist explains. When Mastercard first announced the product in June, The Block listed x402 only as one of several open protocols being built for agents; this is the first time Mastercard is reported running on it.
The flow in the Mastercard pilot, as the outlets describe it, has four steps:
- Before the agent starts, the company sets its task, its permissions and its budget.
- When the agent calls a paid service, the service answers with a 402 response instead of the content. In the Hype demo, payment requests came through Cloudflare’s Monetization Gateway, Cryptonomist reports.
- The agent signs a digital payment voucher, a promise to pay that stays within its authorised limit.
- The provider checks the voucher and only then delivers the image, the data or the computing time.
The vouchers are exchanged offchain, so authorisation happens at machine speed. Providers do not have to settle each purchase on its own: they can collect vouchers and redeem them in a batch later, according to Bitcoin.com News and Cryptonomist. For an image that costs a fraction of a cent, settling every payment separately would cost more than the image.
Mastercard’s part is the layer around the protocol. In the release’s words, quoted by PYMNTS, it takes x402 and “connects it with the trust, security and reach of the Mastercard network”. The release, as summarised by PYMNTS, frames this as the questions a company asks before letting software spend: who authorised the agent, how much it may spend, on what and with whom. Bitcoin.com News sums up the pitch as Mastercard acting as a “trust and authorization layer” for purchases made by agents.
Coinbase, Base, BVNK and Cloudflare: who did what in the pilot
Seven firms are named as pilot partners: Cloudflare, Ant International, AIsa, Base, BVNK, Coinbase and Hype. Their roles, as reported on 20 October:
| Partner | Role in the pilot | Source |
|---|---|---|
| Coinbase | Incubated x402; Coinbase Developer Platform supplied the wallet infrastructure that funded the agent | The Block, Bitcoin.com, Cryptonomist |
| Base | Onchain settlement network (Coinbase’s Ethereum layer 2) | The Block, Bitcoin.com |
| BVNK | Agent wallet; processed payments and settlement in fiat or stablecoins through the Mastercard Global Money Platform | The Block, Bitcoin.com, Cryptonomist |
| Cloudflare | Seller through AI Gateway (eight images), payment requests through its Monetization Gateway, host of the demo | The Block, Cryptonomist |
| AIsa | Seller of one social media research report | The Block, Cryptonomist |
| Hype | The customer: set the task and approved the budget | PYMNTS, Cryptonomist |
| Ant International | Named as a pilot partner; role not described | The Block, Bitcoin.com |
Sellers can be paid in the currency, token or rail they prefer, The Block and Cryptonomist report. That is the BVNK piece. Mastercard bought the London stablecoin infrastructure company this year in a deal valued at up to $1.8 billion, a purchase The Block dates to August, and the agent’s payments ran through BVNK on Mastercard’s Global Money Platform.
For Coinbase, the pilot is one more large payments company running settlement on Base. Three days earlier, Coinbase said it would run the stablecoin side of Marqeta’s card programmes with Base handling settlement, as we reported in our piece on the Coinbase and Marqeta card deal. Readers new to the term can read our explainer on layer 2 networks.
No stablecoin named, no country, no volume
None of the four outlets says which stablecoin, if any, moved in the pilot. The Block, Bitcoin.com News and Cryptonomist refer to stablecoins only in general terms, and the PYMNTS report does not mention them at all. When Mastercard launched the product in June, it said Agent Pay for Machines would work across cards, bank accounts and stablecoins; the October reports say BVNK settles in fiat or stablecoins.
A related gap sits in the plumbing. The outlets call Base the onchain settlement network, yet they also say vouchers are handled offchain and redeemed in batches. Whether the nine payments ended in transactions visible on Base, or were settled on Mastercard’s fiat rails through BVNK, is not stated. Nor is it known whether any Base transaction can be tied to the Hype demo.
Several other questions remain open:
- The total value of the nine payments and the price per purchase.
- Which countries, banks or merchants come after AIsa and Cloudflare.
- When Agent Pay for Machines becomes commercially available, and what it will cost sellers.
- How many developers have joined the early access programme.
For European readers, no availability in the EU has been announced. Any stablecoin payment service offered there would fall under MiCA, the EU rulebook that also decides who supervises the biggest tokens, as our report on the EBA taking over supervision of a major dollar stablecoin explains.
From a June launch with 30 supporters to a working pilot
Mastercard first announced Agent Pay for Machines on 10 June 2026, as a layer on top of its network for the small, frequent payments that card and bank rails handle badly, with spending limits enforced by software and credentials that let an agent prove it is allowed to pay. More than 30 firms signed up as early supporters, among them Coinbase, OKX, Ripple, Polygon, Solana, MoonPay, Anchorage Digital, Aave Labs, Alchemy, Tempo, BVNK, Checkout.com and Cloudflare, The Block reported at the time.
“Agent Pay for Machines will create the conditions for a superbloom of AI business models,” Jorn Lambert, Mastercard’s chief product officer, said then. At launch Mastercard pitched the product at amounts too small for card fees, and The Block named x402 and Tempo’s Machine Payments Protocol as rival open standards without saying which one Mastercard would use. Tempo was itself on the supporter list.
The week has been busy for Mastercard in crypto. On 19 October it announced a risk score that banks can run on stablecoin payments before they move, covered in our report on Mastercard’s stablecoin security product. That tool is for banks checking fraud and sanctions risk; Agent Pay for Machines is for software buying services. The two products sell to different buyers, but both put Mastercard’s network between the stablecoin and the payment.
Visa is working on the same ground. On 19 October, Mesh and Visa set out plans for crypto spending straight from wallet balances, with no wallet, country or date named either, as we reported in our piece on the Mesh and Visa plan.
What to watch after the early access opens
Chiro Aikat, Mastercard’s U.S. co-president, told PYMNTS last month that the payment products that succeed are built on experience and ease of use, and above all on trust. Early access tests the first two. The next signals are concrete ones: a commercial launch date, the first fee schedule for sellers, a named stablecoin and chain for settlement, and merchants beyond the two in the demo.
Bitcoin.com News puts the condition plainly: wider use depends on developers building the APIs into their products and on businesses being willing to let agents manage spending. Mastercard has not said when it will report back on what the sandbox phase shows.