Accepting American Express as a merchant

American Express carries a customer base with materially higher average spend than the four-party networks, and materially higher acceptance costs to go with it. That trade-off is the entire commercial question. Amex is not a method to enable or refuse on principle. It is a method to price against the incremental revenue it brings.

How Amex acceptance differs structurally

Amex operates a three-party model in which it issues the card and acquires the transaction, rather than the four-party model where interchange flows between an issuer and an acquirer. That is why Amex pricing does not decompose into interchange plus scheme fees plus markup in the way Visa and Mastercard do, and why interchange regulation that caps four-party costs generally leaves Amex untouched. You are negotiating a single merchant rate, not a stack.

Interchange

When a three party scheme stops being one

The exclusion merchants rely on is narrower than it looks. Article 1(3) of Regulation (EU) 2015/751 puts transactions with cards issued by three party payment card schemes outside the interchange caps, which is the reason an Amex rate sits where it does.

Article 1(5) then takes much of it back. Where a three party scheme licenses other payment service providers to issue or acquire, or issues with a co-branding partner or through an agent, it is considered to be a four party payment card scheme. The transitional exemption that softened this for limited domestic schemes ran out on 9 December 2018.

So the honest answer to whether your Amex volume carries capped interchange is that it depends on how Amex operates in the market the card was issued in, and it is not the same answer everywhere. That is a question to put to whoever prices your Amex volume, and the answer changes what a fair rate looks like rather than being a piece of trivia.

Contract

Accepting Amex through your PSP or directly

You can hold a direct Amex merchant agreement or accept Amex through your PSP under an aggregated arrangement. The two behave differently on pricing, on settlement timing and on who handles disputes. Aggregated acceptance is simpler and usually more expensive at volume; a direct agreement is worth the administrative overhead once Amex volume becomes material. The threshold where that flips is specific to your business and is worth calculating rather than assuming.

Surcharging

Amex is one of the few instruments you may still surcharge

Article 62(4) of PSD2 stops you charging for the use of a payment instrument whose interchange is regulated under the Interchange Fee Regulation. Three party schemes are outside that regulation, so they are outside the surcharging ban with it. American Express and Diners Club sit in that gap, and consumer Visa and Mastercard do not.

It is not a European yes. Article 62(5) allows each member state to prohibit or limit surcharging further, and several have done exactly that, so this is a national answer to establish per market rather than a right to assume. Where surcharging is available, it also has to be presented honestly at checkout, and the reputational cost of a surprise line is real.

The quieter right in the same article is usually worth more. Article 62(3) stops your provider preventing you from steering a customer towards a given instrument or offering a reduction for using it. Presentation order, default selection and a discount move payment mix without a customer ever seeing a penalty, and on a method with a rate this far above the rest that is where most of the recoverable margin sits.

Trade-off

What the higher rate has to buy

The case for Amex is incremental revenue and the case against it is a higher rate. Both are numbers, so the comparison is arithmetic rather than preference.

Take the gap first. If Amex costs 1.5 percentage points more than your blended rate on the four-party brands, then on a 120 euro average order that is 1.80 euro a transaction, and on 40,000 Amex transactions a year it is 72,000 euro. That is the figure the incremental revenue has to beat, and it belongs in the model before anything else.

Then take the revenue. The question is not what Amex customers spend, it is what they would have spent if you did not accept Amex. A customer holding an Amex card and a Visa card is not incremental revenue, they are the same order on a more expensive rail. What is incremental is the customer who would have gone elsewhere. Separating those two groups is the only analysis that settles whether the rate is worth paying, whether it should be surcharged where that is permitted, or whether presentation order should quietly do the work instead.

Australia: Amex sits outside the October 2026 reform, for now

The Reserve Bank of Australia’s Conclusions Paper of 31 March 2026 removes surcharging on the designated networks, eftpos, Mastercard and Visa, from 1 October 2026. Amex is not a designated network, and the RBA explicitly noted merchant concern about losing the ability to surcharge Amex, stating the issue would be considered in the next review planned for mid-2026 following the 2025 amendments to the Payment Systems (Regulation) Act. American Express has separately said it supports the reforms and is working to remove surcharging from the same date. For an Australian merchant that means the Amex position is settled commercially rather than by regulation, and is worth confirming with your provider rather than inferring.

Which payment provider supports American Express in Europe?

Adyen, Checkout.com, Stripe, Global Payments, Nexi, Buckaroo and Datatrans all name American Express among the brands they accept, among others, as does effectively every European acquirer, so the question is the rate and the structure rather than the availability. Ask what your effective Amex rate is, whether you are on an aggregated or direct arrangement, and what your Amex volume and average order value actually are. That last figure is what gives you a negotiating position, and most merchants have never looked it up.

Reviewing what Amex costs you

Amex is frequently the single highest-rate line on a statement and one of the least frequently renegotiated. Start by establishing whether you are overpaying your PSP, or move straight to cutting your PSP costs, where interchange, scheme fees and markup are separated before anything is negotiated.

Relevant markets: global