Visa Is Building an Identity System for AI Agents

Visa's technology chief spent the spring being humbled by a machine. An AI model from Anthropic went hunting for holes in the payment network's own code and found plenty that human reviewers had missed.

Rajat Taneja runs technology at Visa. His conclusion: "If the adversary is agentic, then the defence has to be agentic too."

Now flip the transaction around. The same software learning to break systems is learning to shop. Industry estimates cited by Reuters put roughly a third of online commerce, close to $3.1 trillion of transactions, running through AI agents by 2030.

Every one of those purchases needs somebody standing behind it. Visa has spent eighteen months making sure that somebody is Visa.

It is the switch between your bank and the merchant's bank, spanning roughly 14,500 financial institutions and more than 175 million merchant locations. Last year it carried 329 billion transactions, about 900 million a day. Tap your phone at the coffee counter and Visa clears the payment in under a second.

That referee job is why a fifty-year-old card network sits at the center of the AI trade. Agentic commerce will not fail for lack of compute. It fails on trust: which human authorized which software to spend how much, and who eats the loss when the agent gets it wrong.

So Visa is building the software layer for machine buyers. Its Trusted Agent Protocol, published with Cloudflare in October 2025, lets a merchant verify that an agent is what it claims to be. Agentic Ready put it into the banks, with live purchases across more than 30 European issuers by July.

In June came OpenAI; in September, a Know-Your-Agent framework with Mastercard and Ant International.

The fee machine has not waited for any of this. Revenue rose 14% to $11.6 billion in the quarter ended in June. Payments volume crossed $4 trillion in a single quarter for the first time, and processed transactions grew 10%.

The number worth staring at is in the mix. Value-added services, the risk, advisory and marketing work Visa sells on top of its network, grew 34% to $3.8 billion. That is close to a third of revenue, compounding three times faster than payment volume.

Defending the franchise is getting pricier. Client incentives rose 18%, faster than revenue, and international transaction revenue grew just 6% while cross-border volume rose 12%. Management blamed currency swings and a lower-yield mix.

Operating margin slipped to about 59%. In July, Visa cut 7% of staff, booked $563 million in severance and pointed the savings at AI and stablecoins.

Here is the question that decides the stock. Is agentic commerce a new fee line, or a leak in the existing one? The market has voted for the leak. Visa's forward multiple has fallen from its peak and sits below its own five-year median.

What re-rates it is disclosure. Show the market agents transacting through Visa tokens at scale, or another year of value-added services above 20% growth, and the story changes. Visa has not published agentic volume, and 34 of 37 analysts still rate the shares a buy or better.

Until then, the market is paying for an option. Write the bear case the way a short-seller would. Cards charge merchants 2% to 3% of the ticket; a stablecoin on a fast chain settles for fractions of a penny.

When the buyer is software, rail choice becomes a setting. An agent will compare settlement costs on every purchase in a way no human shopper bothers to. Citrini Research's February scenario about agents routing around interchange knocked Visa, Mastercard and American Express down 4% to 8% in a session.

The precedent is not reassuring. Brazil built Pix and India built UPI, and Visa's own risk factors name government-imposed restrictions on payment systems. On Sept. 1, twenty-one institutions, including Goldman Sachs, Bank of America and Wells Fargo, committed to a joint dollar stablecoin.

Those banks pay Visa's fees, and they are funding an alternative settlement layer. Add a Justice Department suit over debit and a $38 billion interchange settlement nearly a thousand merchants are fighting. What proves the bears right? The first quarter Visa discloses agentic volume and it is a rounding error.

If routing is the product, the toll is the casualty.

Visa's rebuttal is that the toll was never the product. What merchants buy is the guarantee: who makes you whole when a transaction goes wrong, and which network can prove the buyer authorized the charge. Stablecoins move money; they do not extend credit or hand out chargebacks.

That is why tokenization is the quiet win. Nearly 60% of Visa's e-commerce transactions ride on tokens instead of exposed card numbers, and Visa says its models stop more than $40 billion of fraud a year.

Machines will do more of the shopping from here, and somebody still has to vouch for them. What we're watching: the fourth-quarter print in late October, the Nov. 16 fairness hearing on the interchange settlement, and the first time Visa puts a number on agentic volume.

Disclosure: The Signal holds no position in V. Positions may change. This is not financial advice.