Mastercard

Also called MasterCard, MC, Mastercard Incorporated

The second-largest card network. Same structure as Visa: sets rules and interchange, keeps assessments, issues nothing and lends nothing.

What it is

Mastercard is a card network operating on the same four-party structure as Visa. It authorizes, clears and settles transactions between issuing banks and acquiring banks, publishes interchange schedules, enforces the operating rules that govern merchants and service providers, and earns assessments and network fees on volume. It does not issue cards, does not hold merchant accounts, and does not decide whether your transaction is approved — the issuer does that. Operationally Mastercard differs from Visa in some details a merchant will actually notice. Mastercard permits surcharging up to 4% where Visa caps it at 3% or actual cost of acceptance, whichever is lower. Its Service Provider Registration program governs ISOs and PayFacs, but unlike Visa, Mastercard does not publish its registration fee amounts — its own FAQ confirms fees exist, are generated on submission and renew annually, without stating a number. Secondary industry sources converge on roughly $5,000 initial plus $5,000 annual, but that figure is not confirmed by Mastercard. In 2026 Mastercard has been the more publicly aggressive of the two networks on agentic commerce. Agent Pay is live globally with 30-plus industry partners, Mastercard launched Agent Pay for Machines in June 2026 and expanded to Hong Kong after Australia, the US and India, and it built a Verifiable Intent capability with Google. Its CEO's public position is blunt: cards will prevail in an agentic world.

Why it matters to your business

If you surcharge in Florida, the Visa and Mastercard rules are not the same, and the difference is a real number. Mastercard allows up to 4%; Visa caps at 3% or your actual cost of acceptance, whichever is lower. A dual-pricing or surcharge program configured to a single blended percentage across both brands is either leaving money on the table or violating a brand rule. More broadly, Mastercard is the second half of the duopoly that determines the floor on your card costs. Every steering right, every category-acceptance decision and every surcharge rule you use comes with two versions — theirs and Visa's — and your POS has to know the difference.

Where it gets contested

Mastercard is a co-defendant in the same interchange litigation as Visa and is bound by the same revised settlement approved June 9, 2026. The merchant critique is identical: a network that sets default interchange on behalf of thousands of competing issuers is functionally setting a floor on the cost of acceptance, and no individual small merchant has the leverage to negotiate around it. The fee-opacity criticism lands harder on Mastercard in one specific place. Mastercard's own Service Provider Registration FAQ describes the fee mechanics without publishing amounts, which means an ISO or PayFac cannot verify what it is being charged against a public schedule the way it can with Visa's published $5,000/$5,000. That gap is where sponsor markups live — several legal and industry sources quote $10,000 initial per brand, roughly double Visa's published figure, most plausibly because sponsors bundle their own onboarding and compliance costs into the number. Mastercard's defense on both fronts is the same as Visa's: interchange funds issuance, and registration fees fund the risk and compliance apparatus that keeps bad actors off the network. Both are true. Neither makes the pricing legible to a merchant.

How to check it yourself

Ask your processor to show you, in writing, the surcharge percentage configured for Visa versus Mastercard in your POS or gateway. If the answer is one number for both brands, the configuration is wrong — the caps are 3% (or actual cost, if lower) for Visa and up to 4% for Mastercard.

Receipts

Claims above that are checkable, with where to check them. Published so you do not have to take anyone's word for it.

Mastercard's Service Provider Registration FAQ confirms registration fees generate on submission and renew annually for the life of the relationship, but publishes no amounts
mastercard.com ↗
Mastercard launched Agent Pay for Machines in June 2026 as part of its agentic commerce push
mastercard.com ↗
Surcharge caps differ by brand: Visa 3% or actual cost of acceptance (whichever is lower), Mastercard up to 4%
sleftpayments.com ↗