# How Visa and Mastercard Actually Work > Peek behind the curtain at how payment networks route money, manage risk, and split swipe fees globally. - Title: How Visa and Mastercard Actually Work · Tautology — Shortify - Summary: Peek behind the curtain at how payment networks route money, manage risk, and split swipe fees globally. Card networks don't issue cards or hold deposits… - Keywords: payments, fintech, banking, visa, business, technology, startups, Mastercard, Actually, Work, Tautology - Source: Tautology — https://tautology.town/2026/06/01/card-networks.html - Published: 2026-06-01T00:00:00+00:00 - Read time: 2 min - Topics: payments, fintech, banking, visa, business, technology, startups ## Not banks or card issuers Visa and Mastercard do not issue credit cards, manage bank accounts, set up checkout software, or manufacture point-of-sale hardware. > They aren’t the company that issues the card... Nor do they manufacture the point of sale hardware. ## Connecting issuers to merchants Card networks serve as a bridge, connecting cardholders and issuing banks on one side with merchants and acquiring banks on the other. > Visa and Mastercard are card networks, facilitating card transactions by connecting the cardholders and issuers to the merchants and acquirers. ## Four jobs of a network To keep global commerce moving, networks route transaction messages, settle funds between banks, set fee incentives, and enforce network rules. ## Telecom for payments Networks maintain dedicated data centers and lease private fiber-optic cables to route authorization messages between issuers and acquirers. > Mastercard calls this activity 'switching', seeing itself as a network switch. ## Data centers with actual moats Visa operates heavily fortified, redundant data centers built to survive severe natural disasters and attacks, including a flagship facility in Virginia. > The facility... is locked down like a digital Fort Knox. ## How transaction routing works Card numbers act like IP addresses. The first six to eight digits identify your issuing bank so the network can route authorization requests instantly. > The first 6 to 8 digits of the PAN identifies the card issuer and is called the Bank Identification Number. ## Coordinating daily net settlements Beyond messaging, networks calculate the net total of debits and credits across all participating banks each day to transfer money efficiently. > To be efficient, Visa does net settlement: every day, each network participant’s debits and credits are totalled... ## Cross-border banking adapter Networks simplify international payments by handling currency conversions and cross-border bank relationships so individual institutions don't have to. > Visa acts as an adapter between banking systems with its global banking relationships. ## Billion-dollar settlement liquidity Moving global funds exposes networks to non-payment risk, forcing Visa to hold billions in liquidity to cover daily bank settlement defaults. > As of September 30, 2024, we held $11.2 billion of our total available liquidity to fund daily settlement... ## Dissecting a swipe fee On a $100 swipe with a 2.5% fee, the payment processor gets $0.35, the card network gets $0.15, and the cardholder's bank takes $2.00. ## Issuers take the biggest cut Card issuers keep the largest share of fees because they take on credit risk and zero-liability fraud protections, which in turn funds card rewards. > Surprisingly, the issuing bank keeps most and the network takes the least, by an order of magnitude! ## Steering behavior with fees Networks adjust interchange rates to incentivize specific behaviors, offering lower fees for secure transactions and charging higher rates on business cards. > The network’s goal is to set fees that incentivize desired behaviors on their network... ## Regulatory caps shape rewards While US cards generate large issuer fees for lavish rewards, the EU caps interchange at 0.3%, stifling credit rewards and boosting alternative payments. > In the EU, interchange fees are restricted to 0.3%, which explains the lack of rewards cards... ## A massive rulebook governs all Networks enforce strict technical and operational guidelines via massive rulebooks, levying fines up to $1 million per month for violations. > These rules are detailed in 'Visa Core Rules and Visa Product and Service Rules', a 923 page volume... ## Built-in dispute resolution Unlike cash or bank transfers, card networks offer structured chargeback mechanisms for fraud or broken promises without forcing users into court. > When a payment method doesn’t have a dedicated dispute mechanism, the legal system is used to settle disputes. ## Efficient forced arbitration If banks cannot resolve a dispute, Visa acts as an arbitrator charging a $600 review fee. The losing party pays, encouraging banks to settle quickly. > The losing party pays the original transaction amount plus the review fee, so both parties have a lot of incentive to resolve it... ## The virtuous payments loop Card networks thrive on network effects: more cardholders attract more accepting merchants, building a self-reinforcing engine of global payments. > More cards means more merchants, more merchants mean more cards, and more of everything is good for the network. ## Key takeaway Card networks don't issue cards or hold deposits, they operate the telecom and banking infrastructure that routes transaction messages, manages global settlement risk, and sets system-wide fee incentives.