Agent payments, the useful 20%

For reading Visa and Mastercard news with the right questions, and for asking whether the old card rails capture agent money or get routed around. Everything else is deliberately left out.

The one confusion. "An agent that hunts for the best deal will hunt for the cheapest way to pay, so agents will route around cards." Mostly, no. The buyer never sees the card fee; the merchant pays it. For the buyer, a card is the best deal on the table: rewards, plus the right to force a refund. So an agent working for a buyer keeps using the card. The bypass threat is real, but it lives in two specific places: payments too small for a card to make sense, and checkouts where the merchant makes the fee visible (a surcharge for cards, a discount for paying by bank).

Who gets which slice

A $100 online purchase on a US credit card. Round numbers; the shape matters more than the decimals.

Who	Their slice	Why
Buyer	Pays $100, often gets $1–2 back	The rewards are funded by the bank's cut
Card-issuing bank	About $2, called interchange (the bank's cut)	Carries the credit risk and pays the rewards
Visa or Mastercard	Well under 30 cents	Visa's entire revenue last quarter was about 29 cents per $100 of volume, pricey cross-border fees included
Merchant's processor	The rest of the merchant's 2.5–3%	Stripe, Adyen and friends get the merchant paid
Merchant	Pays all of it	Which is why the merchant, not the buyer, wants a cheaper road

So the networks are a thin toll on a huge road: $11.6 billion of revenue on more than $4 trillion of payments in the quarter to June 2026. Roughly 16 cents for every transaction they process. Per-transaction fees are why they love agents.

How they make money from agents

Move	Think of it as	What actually happens
The toll	A turnstile that charges per head	Fees per transaction and per dollar. An agent that splits one basket across five shops makes five transactions.
Agent tokens	A stand-in card number for one agent	Each agent gets its own token (a stand-in card number) with spending limits bound to it. Mastercard calls them Agentic Tokens. Issuing and checking tokens is a paid service.
Know-your-agent	A bouncer checking IDs	Visa's Trusted Agent Protocol and Mastercard's agent registration let a merchant tell an authorized agent from a scraping bot.
Verifiable intent	A signed note from the buyer	Proof of what the person actually asked for. It changes fraud scoring and who eats a dispute.
The rulebook	The referee	Who pays when the agent buys the wrong thing. Mastercard applies every existing chargeback (forced refund) right to agent purchases. Rules are what let strangers trust each other with money.
The switchboard	The operator who connects any call	Visa's Intelligent Commerce Connect accepts other networks' cards and four rival agent protocols. Mastercard's Agent Pay for Machines (June 2026) settles over cards, bank transfers and stablecoins. Both are founding members of the x402 Foundation, the stablecoin protocol that bypasses them.

Rows two to six are value-added services (the tools they sell on top of the network). That's where the agent story shows up first. Visa's grew 34% to $3.8 billion last quarter, about a third of its revenue. Mastercard's grew 20%.

Same fact, both cases

The bull case, in the words of Mastercard's CFO in May: agents "will not necessarily be emotionally attached to shopping from the same merchant." No loyalty means they shop around, split baskets, and make more transactions. Visa's CFO made the same argument.

The bear case is the same fact. No loyalty to the merchant, so why loyalty to the card? The one confusion answers it: loyalty to the card is decided by who pays the fee and who can see it, not by the agent's temperament.

Where the bypass actually lives

Tiny machine payments. By April 2026, x402 had carried 165 million agent payments totalling about $50 million, so the average payment was about 30 cents. At Stripe's US list price (2.9% plus 30 cents), a card would cost more than the payment itself. Cards never served this zone and stablecoins own it. This is new volume cards couldn't price, not volume stolen from them.
Checkouts the merchant controls. A merchant who offers 2% off for paying by bank transfer makes the fee visible, and a price-hunting agent takes the discount every time. That's slow in the US, where rewards and card rules push back. It's cheap wherever instant bank payments are already normal (Brazil's Pix, India's UPI).

Read an agent headline in 30 seconds

Volume, services or bypass? Most agent news is services dressed up as volume.
Who pays the fee in this flow, and can the buyer's agent see it?
Is the network still in the trust path, even if the money moves somewhere else?

Headline	The read
Visa value-added services +34% to $3.8B (Jul 2026)	Services. The agent money lands here before it lands in volume.
Mastercard Agent Pay for Machines settles in stablecoins (Jun 2026)	Switchboard. The money may leave the card rail, but Mastercard stays as the ID check and the rulebook. A hedge, not a surrender.
x402 passes 165M agent payments (Apr 2026)	Bypass, but in the zone cards never served. About $50M in total, against Visa's $4 trillion a quarter.

The money-as-message question, so far. If money is becoming pure information, do the incumbent rails capture it or get routed around? The evidence to date says they're trying to become the information: who the agent is, what it was allowed to buy, who pays if it's wrong. The money gets to take whichever road is cheapest. If that works, the toll moves from the road to the passport check. So watch value-added services, not payments volume.

Signals that would change the picture

Signal	Why it matters
A published price list for agent transactions	Visa's CEO has said agent commerce will scale through standards, products, rules and pricing. There's no public price list yet. Until there is, agent revenue is the ordinary toll plus services.
Credentialed agent purchases get a liability shift	If merchants eat fewer disputes when an agent carries a network credential, merchants will insist on credentials, and the networks own them. The strongest moat signal.
Big US merchants discounting bank checkout for agents	The strongest bear signal. It means the bypass has moved from tiny machine payments into ordinary shopping.
Stablecoins in consumer checkout, not just machine-to-machine	The same bear signal, coming from the other direction.
Networks disclosing agents' share of volume	Right now nobody can measure the thing everyone is pricing in.

Words you will see

Interchange	The card-issuing bank's cut, paid by the merchant. The big slice.
Network fee	Visa's or Mastercard's cut. The thin slice, charged on every transaction.
Token	A stand-in card number. Useless if stolen, and it can carry limits: this agent, this shop, this amount.
Card-not-present	Online, with no physical card. Riskier, so the merchant usually carries the fraud losses. Agent purchases start here.
Chargeback	A refund the buyer forces through their bank. The rulebook decides who eats it.
Value-added services	Everything sold on top of the network: fraud scoring, tokens, authentication, data. The fastest-growing line at both.
Stablecoin	Crypto pegged to the dollar. Cheap to move in tiny amounts, which is the whole point for machines.
x402	A way for a website to answer "pay 5 cents first" and for an agent to pay it instantly in stablecoins. Started by Coinbase, now run by a Linux Foundation group.

Deliberately not here

Whether to buy V or MA. This is not investment advice. The protocol-by-protocol spec war (ACP, AP2, UCP, MPP). They're layers rather than rivals, and the networks support all of them, so the spec war doesn't decide who gets paid. Interchange caps and antitrust cases. They're real, but they move the size of the toll, not the agent story. Crypto beyond payments.

Rich Price · primer · September 21, 2026 · Sources: Visa Q3 FY26 · Mastercard Q2 2026 · Payments Dive, CFOs, May 2026 · Agent Pay for Machines · Intelligent Commerce Connect · Verifiable Intent vs TAP · x402 Foundation · Visa CEO on agent commerce