Every time you swipe, tap, or insert a credit card, a fee flows invisibly from the merchant to the card ecosystem. Interchange — the largest component of that fee — is the engine that funds reward programs, airline miles, and cashback offers. Understanding it explains why your card issuer wants you to use your card for everything.
The Four-Party Model
Modern card transactions involve four parties, each with a role in routing and settling the payment:
Cardholder
Makes purchase with card
Merchant
Accepts the card payment
Acquirer
Merchant's bank, processes transactions
Issuer
Cardholder's bank, authorizes & pays
Fee Flow on a $100 Transaction
Why Interchange Rates Vary
Interchange is not a flat fee — Visa alone publishes hundreds of rate tiers. The main variables are:
- Card type — Rewards cards carry higher interchange than basic cards; premium cards (Sapphire Reserve, Amex Platinum) carry the highest rates.
- Transaction type — Card-present (swipe/tap) is lower risk than card-not-present (online). CNP transactions attract a higher rate to compensate for fraud risk.
- Merchant category — Supermarkets and gas stations are capped at lower rates by negotiation. Airlines and hotels pay higher rates.
- Card network — AmEx (closed-loop) typically charges higher rates but also handles more of the processing value chain.
The Rewards Funding Loop
Premium rewards cards generate ~2–3% interchange per transaction. Issuers rebate ~1–1.5% back to cardholders as points/cashback and keep the remainder as profit. This is why premium cards require high spend to justify their annual fees — and why merchants have lobbied intensively to cap interchange rates (EU cap: 0.3% credit, 0.2% debit).
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Last Updated
April 2026