Card Network Economics: How Visa and Mastercard Actually Make Money

Every time a consumer taps a card at a terminal, a complex chain of fees fires between four distinct parties. The merchant sees a single deduction of roughly 2-3% in the US, but that number is actually an aggregate of interchange fees, scheme assessments, and acquirer markups, each flowing to a different entity. Understanding how Visa and Mastercard extract revenue from this system explains why card acceptance costs remain stubbornly high and why alternative settlement rails are gaining traction.

In fiscal year 2025, Visa processed $14 trillion in total payments volume across 258 billion transactions, generating $40 billion in net revenue. Mastercard handled $9.2 trillion in gross dollar volume the same year. Combined, these two networks facilitated over $23 trillion in global card spending. This article breaks down where the money actually flows.

The Four-Party Card Model

Card payments operate on what the industry calls the four-party model (sometimes called the four-corner model). Despite the name, there are actually five entities involved: the cardholder, the merchant, the issuing bank, the acquiring bank, and the card network itself.

• Cardholder: the consumer who pays with a Visa or Mastercard branded card
• Issuer: the bank that issued the card to the consumer (e.g., Chase, Barclays, Capital One). The issuer extends credit or holds the cardholder's deposit account
• Acquirer: the bank or payment processor that has a relationship with the merchant. The acquirer routes the transaction to the card network and settles funds to the merchant
• Merchant: the business accepting the card payment for goods or services
• Card network (scheme): Visa or Mastercard, which sets the rules, provides the switching infrastructure, and determines interchange rates

The card network sits at the center, connecting issuers and acquirers. Visa and Mastercard do not issue cards or extend credit directly. They operate the rails and set the fee schedules that govern every transaction passing through their networks.

Key distinction: Visa and Mastercard are networks, not lenders. American Express and Discover operate differently: they often act as both issuer and network (the three-party model), which is why their merchant fees tend to be even higher.

Anatomy of a Card Transaction Fee

The total fee a merchant pays for each card transaction is called the Merchant Discount Rate (MDR). This fee comprises three distinct components, often remembered by the mnemonic MAI: Markup, Assessments, and Interchange.

Interchange: The Largest Component

Interchange fees are paid by the acquirer to the issuing bank on every transaction. The card network sets these rates, and they are non-negotiable. Interchange typically constitutes 70-80% of the total merchant cost, making it by far the largest component.

Rates vary based on card type (credit, debit, rewards, commercial), transaction method (card-present vs. card-not-present), merchant category code, and region. A standard US consumer credit card transaction might carry an interchange rate of 1.50% + $0.10, while a premium rewards card could reach 2.40% + $0.10 or higher.

Scheme Fees (Assessments)

Scheme fees are what Visa and Mastercard charge directly for using their network. These go straight to the card network to fund operations, technology, marketing, and profit. Assessment fees are typically much smaller than interchange, often around 0.13-0.15% of the transaction value, sometimes with a small per-transaction fee on top.

In addition to base assessments, the networks charge a growing number of ancillary fees: Visa's Fixed Acquirer Network Fee (FANF) is a monthly charge based on merchant locations, and Mastercard's Merchant Location Fee (MLF) costs $1.25 per active merchant location per month. These non-transactional fees have proliferated in recent years, adding complexity to the cost structure.

Acquirer Markup

The acquirer markup is the fee charged by the merchant's payment processor or acquiring bank for their services: routing transactions, handling settlement, providing terminals, managing chargebacks, and delivering reporting. Unlike interchange and scheme fees, the acquirer markup is negotiable.

Under interchange-plus-plus (IC++) pricing, merchants see all three components separated. Under flat-rate pricing (as offered by processors like Square or Stripe), the three components are bundled into a single rate, typically 2.6-2.9% + $0.10-$0.30, giving the processor more margin flexibility.

Where Each Basis Point Goes

To make this concrete, here is an approximate breakdown of a $100 in-store credit card purchase on a standard rewards card in the United States:

The merchant receives approximately $97.77-$98.05 of the original $100. On a card-not-present (online) transaction, total fees run higher because interchange rates increase to compensate for elevated fraud risk, and additional digital commerce service fees apply.

Credit Cards vs. Debit Cards: Different Economics

Credit and debit cards look identical to consumers at the point of sale, but their economics diverge dramatically. Credit cards generate roughly three to four times more interchange revenue per transaction than debit cards, which is why issuers aggressively market credit cards with generous rewards programs.

The Durbin Amendment (2010, effective 2011) capped debit interchange for banks with over $10 billion in assets at $0.21 + 0.05% per transaction, plus an optional $0.01 fraud-prevention adjustment. Before Durbin, average debit interchange was approximately $0.44 per transaction. The regulation halved debit interchange overnight for large issuers but left credit card rates entirely untouched.

The consequences were significant: the percentage of regulated banks offering free checking accounts dropped from approximately 60% to under 20%, and monthly checking account fees more than doubled. Issuers also responded by doubling down on credit card marketing, channeling consumers toward higher-interchange products.

How Visa and Mastercard Generate Revenue

Despite setting interchange rates, Visa and Mastercard do not collect interchange directly: that fee flows from acquirer to issuer. The networks generate their own revenue through several distinct streams:

• Service revenue: fees based on payment volume flowing through the network
• Data processing revenue: per-transaction fees for authorization, clearing, and settlement
• International transaction revenue: premium fees on cross-border transactions
• Value-added services: fraud prevention, tokenization, analytics, consulting, and identity verification products

Value-added services have become a critical growth driver. Visa reported that over 50% of its transactions were tokenized in FY2025, and both networks are investing heavily in services beyond basic payment switching. Mastercard classifies its revenue into two buckets: payment network revenue and value-added services and solutions.

Cross-border transactions are especially profitable. When a US cardholder uses their card in Europe, both the network and the issuer collect premium fees. However, cross-border volume growth has decelerated for three consecutive years: from 15% to 12% for Visa and 18% to 15% for Mastercard in 2025.

Regional Differences in Interchange

Card acceptance costs vary enormously by geography, driven primarily by regulation. The divergence between the US and Europe illustrates how policy decisions directly shape payment economics.

United States: High Fees, Rich Rewards

The US has among the highest interchange rates in the developed world. US credit card interchange averages approximately 1.80% according to CMSPI estimates, with no federal cap on credit interchange. The system supports generous consumer rewards programs (cashback, travel points, lounge access) that are effectively funded by merchant fees. Interchange makes up an average of 86% of total merchant transaction costs in the US.

Visa alone publishes hundreds of distinct interchange rate categories, varying by card type, merchant category, transaction method, and data level submitted. A supermarket accepting a Visa Traditional card in-person faces a different rate than an e-commerce merchant accepting a Visa Signature Preferred card online. This complexity creates an entire industry of interchange optimization consultants.

European Union: Capped and Predictable

The EU Interchange Fee Regulation (IFR), effective since 2015, caps consumer debit card interchange at 0.2% and consumer credit card interchange at 0.3% of the transaction value. These caps apply to personal cards where an intermediary exists but exclude commercial cards and three-party schemes like American Express.

The result: European merchants pay dramatically less for card acceptance. A €100 credit card purchase in Germany generates at most €0.30 in interchange, compared to $1.50-$2.40 for the same transaction in the US. The tradeoff is that European rewards programs are notably less generous than their American counterparts.

Emerging Markets: High Rates, Rapid Evolution

Markets like Brazil, India, and Southeast Asia present a mixed picture. Brazil's interchange rates are among the highest globally. India eliminated merchant discount rates on UPI payments entirely, creating a zero-fee real-time payment system that has captured over 80% of digital transactions. This approach demonstrates that payment networks can function without per-transaction merchant fees when subsidized differently.

India's UPI precedent: India's Unified Payments Interface processes billions of transactions monthly with zero merchant fees, funded instead by government subsidies and bank cross-selling. It demonstrates that interchange is a business model choice, not a technological necessity.

Network Effects and Competitive Moats

Visa and Mastercard's dominance rests on powerful two-sided network effects. More cardholders make the networks more attractive to merchants, and wider merchant acceptance makes the cards more useful to consumers. This flywheel has been spinning for decades and creates formidable barriers to entry.

As of 2025, Visa holds 52.2% of global credit card market share, with Mastercard at 21.6%. Together, they account for nearly three-quarters of global credit card volume. The US market alone had 2.29 billion Visa and Mastercard branded cards in circulation at the end of 2025.

Several structural advantages reinforce this position:

• Universal merchant acceptance: consumers expect their card to work everywhere
• Issuer relationships: thousands of banks worldwide issue cards on their networks
• Brand trust: decades of consumer familiarity and fraud protection guarantees
• Regulatory compliance infrastructure: PCI DSS, 3D Secure, and tokenization standards
• Consumer protections: chargeback rights, zero-liability fraud policies, and purchase protections

These moats explain why card fees have remained high despite merchant complaints. The 2025 Visa/Mastercard interchange settlement, which proposes a 10 basis point reduction in average US credit interchange for five years and caps standard consumer credit rates at 1.25% (125 bps) for eight years, represents the first meaningful concession in decades of litigation. Even so, the proposed caps still leave US rates far above EU levels.

The Hidden Fee Creep

While headline interchange rates receive the most attention, both Visa and Mastercard have steadily increased ancillary and non-transactional fees. Recent examples illustrate the trend:

• Visa introduced a Digital Commerce Service Fee in January 2025 at 0.0075% per authorized card-not-present transaction, increasing to 0.015% (domestic) and 0.035% (cross-border) effective April 2026
• Mastercard's Transaction Processing Excellence Fee rose to 0.30% ($0.05 minimum) on undefined authorizations in January 2026
• Mastercard expanded its Merchant Advice Code Fee to $0.03 on all declined card-not-present transactions using specific decline codes
• Visa is introducing an Integrity Risk Fee specifically for cryptocurrency transactions in April 2026

These fees may seem small individually, but they compound across millions of transactions. They also signal a strategic shift: the networks are diversifying their revenue streams beyond pure assessment fees, making the total cost of card acceptance increasingly opaque.

Why Merchants Pay: The Consumer Protection Tradeoff

Merchants accept the 2-3% fee burden because card networks provide genuine value beyond payment finality:

• Chargeback rights give consumers confidence to transact, increasing willingness to spend
• Fraud liability shifts protect merchants from certain types of unauthorized transactions
• Guaranteed settlement means merchants receive funds regardless of whether the cardholder pays their credit card bill
• Global acceptance standards enable merchants to serve international customers without custom integrations per country

These protections are real and valuable. Any alternative payment rail that aims to displace cards must address them, either by replicating the protections or by offering sufficient cost savings that merchants are willing to accept the tradeoff.

Where Stablecoins Fit In

The card fee stack exists because the four-party model requires intermediaries at every step. Each intermediary adds cost. Stablecoins like USDB on Spark offer a fundamentally different architecture: peer-to-peer value transfer on a shared ledger, with no issuer/acquirer split, no interchange, and no scheme fees.

The cost comparison is stark. A merchant accepting a fiat-backed stablecoin payment on Spark pays near-zero transaction fees versus the 2-3% MDR on cards. For a business processing $1 million in annual card volume, the difference between 2.2% card fees and near-zero stablecoin rails represents roughly $22,000 in annual savings.

What Stablecoins Don't Yet Replace

Honest assessment requires acknowledging what card networks provide that stablecoin rails currently lack:

• Consumer chargeback protection: stablecoin transactions are final by default, with no network-level dispute resolution
• Credit extension: cards let consumers spend money they don't yet have, which stablecoins don't natively support
• Universal consumer adoption: billions of people carry cards, while stablecoin wallets remain niche
• Regulatory clarity: card networks operate under decades of established consumer protection law

These gaps are narrowing. Application-layer dispute resolution, buy-now-pay-later integrations, and e-money token regulatory frameworks are emerging. But the network effects gap remains the largest obstacle: a payment method is only useful where it's accepted.

The Merchant Perspective

For merchants already operating on thin margins (restaurants at 3-5%, grocery at 1-2%), the 2-3% card fee represents a significant share of profit. This is why merchant categories with the tightest margins, such as grocery and fuel, have historically pushed hardest for interchange reform and alternative payment methods.

Stablecoin acceptance makes the most economic sense for these margin-sensitive verticals, for high-ticket purchases where the percentage-based fee is large in absolute terms, and for cross-border transactions where international card fees can reach 3-4% or higher. A Spark-powered wallet like General Bread can facilitate these payments with self-custodial stablecoin transfers, giving merchants a viable path to reducing payment acceptance costs.

The Road Ahead

Card networks are not standing still. Visa and Mastercard are investing billions in real-time payment infrastructure, stablecoin partnerships, and tokenization technology. They recognize that their long-term competitive position depends on remaining the default payment rail, even as the underlying technology shifts.

The global trajectory points toward lower interchange through regulation (the EU model spreading to more jurisdictions), increased fee complexity through ancillary charges, and growing competition from account-to-account payment systems like India's UPI, Brazil's PIX, and stablecoin networks.

For builders and merchants evaluating payment infrastructure, the economics are clear: the four-party model extracts 2-3% on every transaction because the architecture requires it. Alternative rails that eliminate intermediaries can structurally reduce these costs. The question is no longer whether cheaper payment rails exist, but how quickly they can achieve the network effects and consumer protections that make card networks dominant today.

To explore how stablecoin payment rails work in practice, see the Bitcoin merchant payments guide or learn about dollar-denominated Bitcoin payments. Developers building on these rails can start with the Spark documentation and SDK.

This article is for educational purposes only. It does not constitute financial or investment advice. Bitcoin and Layer 2 protocols involve technical and financial risk. Always do your own research and understand the tradeoffs before using any protocol.