# Margin capture across the payment stack
You swipe your card for a $100 dinner. The restaurant never sees $100. By the time the money settles into its bank account, roughly $97 lands, and the missing $3 has already been split between six or seven companies you've never heard of, each defending a sliver of margin that gets thinner every year. Understanding exactly who takes what, and why, is the fastest way to understand power in fintech.
Follow the money from swipe to settlement:
So on $100: roughly $1.80 goes to the issuing bank, $0.15 to the network, $0.20-0.50 to the acquirer/processor, and the embedded fintech might keep $0.30-1.00. The merchant nets somewhere around $96-97. These are illustrative, order-of-magnitude splits, actual contracts vary by industry, card type, and negotiating power.
This is why "payments" isn't one business. It's a stack, and each layer has a different owner, a different regulator, and a different growth ceiling.
Issuers hold the deepest pool historically: interchange plus interest income on revolving credit. But they carry credit risk and regulatory capital burden, and in the US they're constrained by the Durbin Amendment (part of Dodd-Frank), which caps debit interchange for large banks.
Card networks (Visa, Mastercard) run a two-sided platform with extraordinary operating leverage: they don't lend, don't hold deposits, and don't take credit risk. Their toll-road position is why they trade at software-like margins despite being 60-year-old infrastructure. Together they process the vast majority of global card volume, a duopoly that regulators watch closely on both sides of the Atlantic.
Acquirers/processors (Fiserv, Global Payments, Adyen, Stripe) are the plumbers connecting merchants to networks and issuers. This layer has seen the most disruption: legacy acquirers built on batch processing lost share to APIAPIApplication Programming Interface: a standardised interface that lets applications communicate and exchange data without knowing each other's internal workings.View full definition →-first players like Stripe and Adyen, who won by selling developer experience, not basis points.
Embedded fintechs and platforms (Toast for restaurants, Shopify for e-commerce, Square/Block for SMBs) sit closest to the end customer. They monetize payments as a feature of a broader software product, which is why they can often out-earn pure payment processors: they're not just taking a payment margin, they're taking a share of the merchant's total software spend.
Regulators shape all of this without taking a cut. The US lacks a single interchange regulator for credit (debit is capped via Durbin), while the EU's Interchange Fee Regulation directly caps both credit and debit interchange, which is a major reason European card economics look structurally different from American ones. The Consumer Financial Protection Bureau and, in the EU, the European Banking Authority, oversee consumer protection and open banking mandates (like PSD2, the EU's second Payment Services Directive) that reshape who can access payment data and rails at all.
New entrants rarely attack interchange or network fees directly, those are protected by regulation, scale, and bank relationships that took decades to build. Instead, they compete at the acquirer and software layer, where differentiation is technical (APIs, uptime, fraud tools) rather than structural.
The problem: that layer is also the easiest to commoditize. Once Stripe proved APIAPIApplication Programming Interface: a standardised interface that lets applications communicate and exchange data without knowing each other's internal workings.View full definition →-first acquiring was viable, dozens of copycats emerged, and price competition intensified. A processor charging 30 basis points in 2015 might be defending 10-15 basis points in 2026, an estimate, but directionally accurate for a market where merchants increasingly multi-home across processors and negotiate hard.
The way out is vertical integration: capturing more of the stack instead of a thinner slice of one layer. Block's acquisition of Afterpay, or Shopify building Shopify Payments instead of just plugging into Stripe, are both attempts to move from "fee on a transaction" to "share of merchant lifetime valuelifetime valueLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition →."
Pure processor model: A standalone acquirer processes a $100 transaction, keeps 20 basis points ($0.20), pays out everything else. Volume is the only lever. To make $1 million in margin, they need to process $500 million in volume.
Embedded software model: A vertical SaaS platform (like Toast) processes the same $100 transaction but also charges the restaurant a monthly software fee and takes a slightly higher blended payments margin, say 60 basis points, because payments are bundled with point-of-sale software, inventory, and payroll tools the merchant won't easily switch away from. To make $1 million in margin from payments alone, they need only about $167 million in volume, and they have a second, stickier revenue line on top.
This is the strategic logic behind almost every "fintech becomes a bank" or "software company adds payments" move you'll see in the market. Owning the customer relationship lets you capture margin that a pure infrastructure player cannot.
Knowledge check
1. Why does the text argue that 'payments' is not one business but a stack?
2. Interchange fees are set by card networks like Visa and Mastercard, but who actually keeps that revenue?
3. A merchant negotiating a lower processing rate with their acquirer would have the LEAST ability to directly change which part of the $100 transaction split?
4. Select ALL correct answers about why interchange rates differ so much between the US and the EU.
Select all the correct answers.
5. Select ALL correct answers about the layers involved when a software platform like Toast or Shopify embeds payments for its merchants.
Select all the correct answers.
The balance of power is asymmetric and shifting:
🎬 [VIDEO: "How Visa and Mastercard Make Money" - youtube.com/@CNBC - a concise breakdown of the network business model and why it scales so profitably without taking credit risk]
For a deeper technical reference on how funds actually move between banks, the Federal Reserve's payment systems overview is a solid, free primer on clearing and settlement infrastructure in the US.