Introduction - The Two-Second Transaction That Took Seven Decades to Build

A card payment is one of the most familiar acts in modern finance and one of the least understood. A customer taps a card or smartphone against a terminal, waits perhaps a second, and sees an approval message. To the consumer, money appears to have moved instantly from one account to another.

It has not.

What has happened first is an exchange of information. The merchant's payment provider has transmitted an authorization request through a payment network to the institution that issued the card. The issuer has evaluated the account, available credit, authentication data and fraud signals before returning a decision. Clearing and the final settlement of obligations between financial institutions follow separately.

That distinction between the payment experience and the infrastructure beneath it is central to the history of the card industry. Over seven decades, the visible object has evolved from embossed plastic to magnetic stripes, chips, contactless credentials and digital wallets. The underlying achievement, however, has been institutional rather than physical: the creation of networks capable of coordinating banks, merchants and consumers across jurisdictions at enormous scale.

Visa processed 257.5 billion transactions over its networks in its 2025 fiscal year, alongside $14.2 trillion in payment volume. Mastercard says it facilitated more than 175 billion transactions during 2025. Infrastructure built around the payment card has become part of the operating system of global commerce.

Fintech companies subsequently transformed the interface around these networks. PayPal moved payments online. Stripe turned merchant acquiring into software. Revolut combined cards, foreign exchange, banking and investment products inside a mobile application. Apple and Google reduced the physical card to a digital credential stored inside a device.

Yet much of the money continued to move through the institutional architecture built in the twentieth century.

Stablecoins now introduce a different proposition. Rather than changing only how a payment is initiated, they make it possible for a representation of fiat currency itself to circulate on programmable blockchain infrastructure. The distinction matters because payments are no longer the sole issue. Settlement, liquidity, collateral and the architecture through which money moves are also beginning to change.

The most revealing evidence comes from the incumbents. Visa is already settling some obligations in USDC. Mastercard has committed as much as $1.8 billion to acquire stablecoin infrastructure provider BVNK. Stripe bought Bridge. PayPal has issued its own dollar stablecoin. Revolut is moving deeper into stablecoin services while retaining traditional card connectivity.

The next chapter in payment history may therefore be less about replacing the card than about changing what sits underneath it.

1. From BankAmericard to Visa and Mastercard

The modern card industry emerged from a problem of coordination. Credit itself was not new. Merchants had long extended credit to customers, while banks provided consumer loans. What was missing was a standardized instrument capable of carrying a payment relationship across large numbers of unrelated merchants.

Diners Club demonstrated the potential of that model in 1950. Its charge card allowed customers to use a common payment instrument at participating establishments and settle their obligations later. American Express entered the market with its own card in 1958, extending the idea to a much larger financial-services franchise.

The more consequential development came from Bank of America that same year. BankAmericard combined a general-purpose card with revolving bank credit, allowing customers not merely to postpone payment but to carry balances over time. What had previously been a bilateral credit relationship between a customer and a merchant began to become a standardized banking product.

The difficulty was scale. A card carried little value unless enough merchants accepted it, while merchants had little incentive to participate unless enough consumers carried it. The economics were those of a two-sided network long before the term became central to technology investing.

Bank of America responded by licensing BankAmericard to other financial institutions. The network expanded beyond California, and eventually beyond the United States. Governance was separated from Bank of America and transferred to a consortium of participating institutions. In 1976, BankAmericard became Visa.

A competing architecture had been developing in parallel. In 1966, a group of banks formed the Interbank Card Association, creating an alternative to BankAmericard. Its network became associated with the Master Charge brand before adopting the Mastercard name in 1979.

The decisive invention was therefore not plastic. It was interoperability.

A cardholder banking with one institution could purchase goods from a merchant served by another because a common network defined the rules, transmitted the information and coordinated the resulting financial obligations. Instead of every bank negotiating a separate connection with every other bank, a network could provide a common infrastructure.

That model created formidable economies of scale. Each additional issuer made the network more attractive to merchants; each additional merchant made it more valuable to cardholders and banks. Over time, payment acceptance itself became a competitive moat.

Visa and Mastercard would spend the following decades turning that interoperability into global financial infrastructure.

2. What Really Happens When a Card Is Tapped

The apparent simplicity of a contactless payment conceals several distinct technical and financial processes.

When a customer taps a modern card against a terminal, the card and reader typically interact using standards developed under EMV. EMV began as an initiative associated with Europay, Mastercard and Visa and is now maintained through EMVCo. Its purpose is to make payment credentials and acceptance devices interoperable while providing a common security framework.

The shift from the magnetic stripe to the chip was particularly significant. A magnetic stripe carries largely static information. An EMV chip can generate transaction-specific cryptographic data. In contactless payments, EMVCo specifies that a one-time security code is produced for each transaction. More than 15 billion EMV chip cards are now in use globally, and EMVCo estimates that the technology supports the overwhelming majority of card-present transactions worldwide.

Once the credential has interacted with the terminal, however, the card has not independently moved money.

The merchant's acquiring institution or payment processor receives the transaction and sends an authorization request into the appropriate network. Visa or Mastercard determines which institution issued the credential and routes the message toward it.

Much of the traditional messaging architecture of card payments has been influenced by ISO 8583, the international standard governing the structure of financial-transaction-card messages exchanged between acquirers and issuers. The standard provides a common framework for fields such as transaction amounts, merchant information, currency, account identifiers and authorization data. Visa and Mastercard operate proprietary network implementations and have progressively added newer technologies and APIs, but ISO 8583 remains an important part of the industry's technical vocabulary.

At the other end of the network, the issuing bank decides whether to accept the transaction. It can evaluate the status of the account, available funds or credit, merchant characteristics, geographical information, authentication results and increasingly sophisticated fraud signals.

The issuer returns an authorization response through the network to the acquirer and merchant.

The entire round trip can happen in seconds.

The green message on the terminal therefore means something very specific: the issuer has authorized the payment obligation.

It does not necessarily mean that final money has already moved between the financial institutions involved.

That happens through another layer of the system.

3. The Economics of Authorization, Clearing and Settlement

Card infrastructure separates the consumer's payment experience from the ultimate settlement of money.

Authorization is the first step. It establishes that the issuing institution is prepared to honour the transaction. Clearing follows, when transaction information is exchanged and the obligations created across large numbers of individual payments are calculated. Settlement is the point at which those obligations are ultimately discharged between participating financial institutions.

Netting makes the architecture economically efficient. If customers of one bank spend large amounts at merchants served by another institution while flows simultaneously move in the opposite direction, there is little reason to settle each retail payment individually in central-bank money. The system can calculate the net amount owed between participants and settle that balance.

The Bank of England's description of card settlement illustrates the mechanism. Retail card transactions can be available to consumers around the clock, while the resulting interbank obligations are subsequently settled on a deferred net basis through central-bank infrastructure. The payment experience can therefore be continuous even when the deepest layer of settlement is not.

This separation helped electronic card payments scale globally. Messaging could operate rapidly while settlement infrastructure optimized the movement of liquidity between banks.

It also created an elaborate economic structure around the transaction. Issuing banks, acquiring institutions, processors and networks each perform different functions and capture different portions of payment economics. Interchange fees, network assessments, acquiring margins, foreign-exchange charges and fraud costs can all enter the price of accepting a card.

Those economics have become politically significant. Reuters reported that U.S. Visa and Mastercard interchange fees reached $111.2 billion in 2024, roughly four times their 2009 level according to National Retail Federation estimates. Long-running litigation and regulation around card fees illustrate the tension embedded in successful network businesses: the same scale that creates extraordinary interoperability can also create market power.

The issue extends beyond the United States. In the euro area, Reuters reported in 2026 that U.S.-based card companies process nearly two-thirds of card payments, contributing to European policymakers' push for alternative domestic and digital payment infrastructure.

The economic debate around cards is therefore larger than whether contactless payments are convenient. Card networks sit at the intersection of commerce, banking competition, monetary sovereignty and financial infrastructure.

That is why attempts to build alternatives continue even while card volumes reach new records.

4. From Plastic to Software: How Fintech Changed the Interface

The card industry's next major transformation was less about creating another global network than about making the existing infrastructure easier to access.

The physical credential evolved first. Magnetic stripes enabled machine-readable payments. EMV chips strengthened authentication. Contactless technology reduced friction at the point of sale. Digital wallets moved the credential into smartphones and watches, while network tokenisation increasingly allowed substitutes for sensitive card details to travel through the payment ecosystem.

By the end of 2025, Mastercard said nearly 40 per cent of the transactions switched over its network were tokenized. Its ambition is to move e-commerce toward complete tokenisation by the end of the decade.

The more important conceptual shift, however, came from software companies.

PayPal abstracted the underlying card or bank account from online commerce. Stripe abstracted much of the complexity of gateways, acquiring and payment integration behind software interfaces. Adyen consolidated payment acceptance for global merchants. Wise targeted the cost and opacity of moving money across currencies.

Revolut applied the same logic at the consumer level.

Founded in 2015 by Nik Storonsky and Vlad Yatsenko, Revolut initially built its proposition around mobile-first financial services and international spending. The company gradually expanded into deposits, cards, foreign exchange, transfers, investments, lending and cryptoassets.

Its scale demonstrates how rapidly an interface layer can grow on top of established payment rails. Revolut reported 68.3 million customers for 2025 and has since passed 75 million retail customers globally. Revenue reached £4.5 billion in 2025 and pretax profit £1.7 billion, a transformation from challenger fintech into an institution increasingly competing with incumbent banks.

Yet the rise of Revolut also highlights a paradox.

The consumer can experience a financial product that looks radically different from a conventional bank account while a payment still travels through Visa or Mastercard infrastructure.

The fintech revolution transformed distribution, user experience, foreign exchange, onboarding and software integration. It did not make the existing payment architecture irrelevant.

In many cases, it made that architecture almost invisible.

That distinction matters because stablecoins represent a different category of innovation. Rather than building another interface above traditional money, they begin to change the form in which money can circulate underneath the interface.

5. Stablecoins Move the Innovation Into Settlement

A conventional card transaction largely moves information before it moves money. Authorization messages establish payment obligations, clearing calculates what institutions owe, and settlement adjusts balances later.

Stablecoins invert part of that logic.

A dollar-denominated stablecoin such as USDC is itself a transferable digital asset. When ownership changes on a blockchain, the ledger records the transfer of the token rather than merely transmitting an instruction for banks to update separate ledgers later.

This does not eliminate financial infrastructure. It changes its composition.

An issuer such as Circle still has to create and redeem the stablecoin and manage the assets backing it. Users and institutions require custody arrangements. Regulated entities remain subject to compliance requirements. Blockchains require validators or other consensus mechanisms. Conversion between deposits and tokens creates its own points of friction.

Nevertheless, the architecture has distinctive characteristics.

Blockchain networks can function continuously. Transactions can settle outside conventional banking hours. Smart contracts can combine transfers with other operations in a single programmable transaction. Assets and money can potentially exist on common infrastructure rather than across separately maintained databases.

The BIS described stablecoins in 2026 as a core component of blockchain-based financial systems and highlighted their role not just in simple transfers but in more complex transactions where several financial operations can be bundled and executed atomically.

Scale is beginning to make the discussion relevant beyond crypto markets. USDC circulation reached $73.3 billion in the second quarter of 2026, according to Circle figures reported by Reuters, while on-chain transaction volume increased 151 per cent year on year.

But stablecoins should not be confused with a frictionless replacement for bank money.

The BIS remains notably cautious. It argues that current stablecoin structures can fall short of some of the properties expected from money in a modern financial system, particularly uniformity, elasticity under stress and financial integrity. Their reserves also create links back into traditional financial markets rather than eliminating those markets.

Stablecoins are therefore best understood not as a final answer to payments, but as evidence that settlement infrastructure itself has become open to technological competition.

That distinction helps explain why the largest card companies are increasingly interested.

6. Visa, Mastercard and the Move On-Chain

The early cryptocurrency narrative often treated Visa and Mastercard as precisely the type of intermediary blockchain networks were designed to remove.

The strategic behaviour of those companies now points toward a different outcome.

Visa has progressively built stablecoin settlement capabilities into its network. By April 2026, the company said the annualized run rate of its stablecoin settlement pilot had reached approximately $7 billion, more than 50 per cent higher than in the previous quarter. It was expanding support across nine blockchain networks while developing stablecoin-linked card programmes in multiple markets.

The significance is not the size of $7 billion when compared with Visa's trillions of dollars in conventional payment volume. It remains small.

The significance is architectural.

A consumer does not need to pay a merchant directly in cryptocurrency for a blockchain to become part of Visa's infrastructure. The consumer-facing transaction can remain a conventional card payment while institutions use stablecoins for part of the settlement process behind it.

Mastercard is moving more aggressively into the same layer. In March 2026 it agreed to acquire BVNK, a stablecoin payments infrastructure provider, for as much as $1.8 billion. BVNK connects fiat currencies with stablecoins across multiple blockchain networks and jurisdictions. Mastercard described the acquisition as a way to expand cross-border transfers, business payments and payouts using stablecoin infrastructure.

The strategic implication is difficult to miss. Mastercard is not simply experimenting with a token. It is buying infrastructure capable of connecting its existing network to a different settlement architecture.

Stripe reached a similar conclusion earlier. Its acquisition of Bridge, valued at roughly $1.1 billion, gave one of the world's largest internet payment companies infrastructure for moving between traditional currencies and stablecoins. Bridge has since received conditional U.S. regulatory approval to establish a national trust bank, moving the model closer to the regulated financial system.

PayPal has taken another route by issuing PYUSD, placing a stablecoin inside an existing digital payments ecosystem.

Revolut increasingly occupies the boundary between the two worlds. Its platform combines bank deposits, conventional card infrastructure, foreign currencies and cryptoassets, while its U.S. expansion explicitly includes stablecoin services. The broader direction is toward a wallet in which the customer may interact with several forms of money without necessarily thinking about the infrastructure underneath each one.

The card networks are therefore not standing still while blockchain infrastructure develops beside them.

They are attempting to absorb it.

7. The Future Is More Likely to Be Hybrid Than Decentralized

The history of payments cautions against simple replacement narratives.

Cards did not eliminate cash. Digital wallets did not eliminate cards. Fintech applications did not eliminate banks. New infrastructure tends instead to change where particular functions are performed and which institutions capture the economics around them.

Stablecoins may follow the same pattern.

There is already a competing institutional vision for tokenized money. The BIS argues that many of the technological benefits associated with blockchain can potentially be incorporated into the existing two-tier monetary system rather than delegated primarily to privately issued stablecoins.

Project Agorá offers a glimpse of that alternative. Coordinated by the BIS and the Institute of International Finance with central banks and private financial institutions, the project is exploring a shared programmable infrastructure built around tokenized commercial-bank deposits and tokenized central-bank reserves.

In May 2026, the project demonstrated atomic cross-border settlement across currencies in a prototype environment and moved toward testing with real-value transactions. The objective is to preserve settlement in sovereign money while introducing some of the programmability and operational efficiencies associated with tokenisation.

The future competition in payments is therefore unlikely to reduce to Visa versus blockchain, or banks versus stablecoins.

The more consequential competition may be between different architectures for combining them.

A payment initiated through the same smartphone could ultimately draw on a conventional bank deposit, an instant-payment rail, tokenized commercial-bank money or a regulated stablecoin. A card network could continue providing acceptance, identity, routing, fraud controls and consumer protection while the financial institutions behind it gain additional options for settlement.

For the user, almost none of this needs to be visible.

That may be the most important lesson from seventy years of card history. Successful financial infrastructure tends to become invisible. Consumers do not need to understand ISO 8583 to use a Visa card, central-bank settlement to buy a coffee or network tokenisation to pay with a smartphone.

They are unlikely to care whether blockchain technology sits somewhere behind a future transaction either.

What matters is whether the infrastructure makes the payment cheaper, safer, faster or more reliable.

Conclusion - The Card May Survive the Payment Revolution

The history of the payment card is not really the history of plastic. It is the history of abstraction.

Diners Club abstracted individual merchant relationships into a common payment instrument. BankAmericard combined that instrument with scalable consumer credit. Visa and Mastercard abstracted bilateral banking relationships into global interoperable networks. EMV and tokenisation abstracted much of the security complexity. Fintech companies moved the interface into software.

Stablecoins now attempt to move that abstraction one level deeper, into the settlement asset itself.

This does not imply that blockchain will replace the infrastructure developed over the previous seventy years. Visa and Mastercard possess merchant acceptance, institutional relationships, fraud systems, consumer protections and network effects that cannot be recreated merely by launching a faster ledger. Banks continue to provide regulated deposits, credit creation and access to central-bank money. Central banks retain a unique role in providing the ultimate settlement asset of the monetary system.

Blockchain networks bring different capabilities: continuous operation, programmable assets and the possibility of integrating payments with digitally native financial instruments on shared infrastructure.

The emerging payment system is therefore likely to be layered rather than revolutionary.

A consumer may continue to tap a Visa or Mastercard credential. A fintech such as Revolut may continue to control the interface. The merchant may continue to receive its domestic currency. But somewhere between authorization and final settlement, stablecoins, tokenized bank deposits or other forms of programmable money may increasingly become part of the machinery.

The first card revolution changed what people carried in their wallets.

The fintech revolution changed what appeared on their screens.

The next one may leave both almost untouched.

What changes is the infrastructure underneath.

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