Key Takeaways
- European regulators capped interchange fees to protect merchant margins, cutting credit card share to 50% of electronic transactions, compared to over 70% in the United States.
- Low interchange caps in Europe eliminated bank margins for loyalty programs, forcing European issuers to compete on branding and basic convenience rather than cash back.
- Japanese banks kept interchange uncapped and held rewards at 1%, generating high interchange margins that subsidized consumer banking through decades of near-zero interest rates.
- United States fintech startups exist largely because of regulatory quirks like the post-2008 Durbin Amendment debit card interchange exemptions.
European Caps Stifled Rewards and Slowed Card Adoption
European regulators chose a merchant-first regulatory model. They focused on lowering transaction costs for retail businesses by placing strict statutory caps on swipe fees. That single decision altered how European consumers pay for goods.
When interchange revenue vanished, European banks lost the budget to fund consumer loyalty programs. As McKenzie explained: “In Europe, regulators were worried about the cost of interchange to businesses, rather than to consumers, and capped it. Since issuers don't have the margin to compete on rewards paid for by interchange, they instead leaned into branding and convenience, and credit cards became a much smaller portion of the payment mix, about 50% of electronic payments compared to more than 70% in the United States.”
Without 2% cash back or airline miles subsidizing purchases, European consumers had little incentive to reach for credit cards over direct debit cards or cash.
Japan Turned Card Issuance Into a Banking Lifeline
Japan took the opposite path. Japanese regulators avoided hard interchange caps, leaving merchant pricing complex and unconstrained. McKenzie observed: “Curiously, in Japan, interchange is uncapped and, according to the government in the recent past, maddeningly opaque.”
Instead of competing in an aggressive rewards arms race, Japanese banks showed restraint. McKenzie pointed out: “Financial institutions largely held the line on rewards at 1%. That makes card issuance an extremely profitable business to be in in Japan, so much so that it subsidizes the rest of consumer banking in Japan's persistently low interest rate environment.”
For decades, the Bank of Japan maintained ultra-low interest rates. In normal economies, banks make money on net interest margins, taking cheap deposits and lending them out at higher rates. In Japan, that spread vanished. McKenzie noted: “The low interest rate environment had the effect of depressing the net interest margin that consumer deposit accounts generally generate most revenue for them, historically and in much of the world.” Japanese banks kept consumer banking solvent by harvesting merchant interchange spreads instead.
The American Interchange Machine Funded a Tech Sector
In the United States, uncapped credit interchange created a giant consumer reward engine, while regulatory exemptions created the modern fintech industry. When Congress passed financial reforms after the 2008 crisis, the Durbin Amendment capped debit interchange only for institutions with over $10 billion in assets.
Small banks retained high debit swipe fees. Software platforms partnered with those community banks, issuing cards and splitting the interchange revenue. As McKenzie put it: “In particular, due to a quirk of U.S. interchange regulation, they basically fund most of the fintech industry.” A business model that thrives in San Francisco or New York is impossible in Berlin or London.
What to Do With This
Audit your pricing and unit economics against regulatory jurisdiction before building cross-border payment features. If you build card products or embedded finance in the European Union, do not build revenue models around interchange; charge software subscription fees instead. If you operate in the US, structure your card programs with exempt issuing partners to capture debit interchange margins.