Interchange

What Is Interchange?

Interchange is a fee paid by the merchant's bank (acquirer) to the cardholder's bank (issuer) on every card transaction. Set by the card networks—Visa, Mastercard, Amex—it is the largest and most variable component of a merchant's total card acceptance cost, ranging from 0.2% for regulated EU consumer debit cards to 2.5% or more for premium commercial cards issued outside the EEA. Understanding interchange is commercially significant because it is the most impactable cost component through routing decisions.

How Interchange Is Structured

Rate Categories

There are hundreds of interchange categories, differentiated by card type (consumer debit, consumer credit, commercial, prepaid), card geography (domestic, intra-EEA, cross-border international), merchant category code (MCC), transaction method (chip, contactless, card-not-present), and authentication strength (3DS, non-3DS). Acquirers offer merchants either blended pricing—a single averaged rate—or interchange-plus (IC+) pricing, under which the merchant sees the actual interchange category per transaction. IC+ pricing is essential for optimising interchange costs.

The EU Interchange Fee Regulation (IFR)

Within the EEA, the Interchange Fee Regulation caps consumer card interchange at 0.2% for debit and 0.3% for credit, where both issuing and acquiring banks are EEA-resident. Commercial cards, premium cards, and cards issued outside the EEA are not subject to the cap. Routing an EEA-issued consumer card through a non-EEA acquirer loses the IFR benefit and triggers cross-border interchange premiums that can be five to ten times the domestic rate.

Interchange vs. Scheme Fees vs. Acquirer Margin

The total Merchant Discount Rate (MDR) has three components: interchange (paid to the issuer—the largest component), scheme fees (paid to the card network), and acquirer margin (the processing bank's markup). Of these, interchange is the most variable and most impactable through strategic routing: a merchant routing German consumer Visa debit through an EEA acquirer qualifies for the IFR-capped rate rather than a cross-border commercial rate.

How Hellgate Hub Optimises Interchange

Hub's smart routing engine applies BIN-based, currency-based, and geography-based routing rules to minimise interchange costs continuously and automatically. When a transaction arrives, Hub reads the card's BIN to determine issuing country and card type, then routes to the acquirer that produces the lowest interchange category. For EEA-issued consumer cards, this means routing through an EEA-based acquirer connected via Link—qualifying for IFR-regulated domestic rates.

Pulse surfaces per-transaction fee breakdowns and aggregated interchange cost data, enabling merchants to quantify routing savings over time. Merchants migrating from a single global acquirer to a multi-acquirer setup via Hub and Link typically see 0.5–1.5% reductions in blended processing costs on European card volume.

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