American Express merchant fees: how Amex pricing works

American Express merchant fees work differently from Visa and Mastercard fees, and the first question is how you accept Amex. There are two routes. Eligible small businesses can accept through their payment provider, "which sets the rate for card acceptance," while national and regional businesses, and small businesses that prefer it, can accept directly with American Express (American Express).

The route you're on decides who sets your price, which rulebook you follow and where the fees show up, so it's worth knowing which one applies to you before you look at a single rate.

How are American Express merchant fees set?

It depends on which route you're on.

Through a provider, you're in Amex's OptBlue program. Amex says "your provider sets your American Express Rate," just as it does for the other card brands you accept, and that with OptBlue "the rate is set by the provider (not American Express)" (American Express). US businesses with estimated annual Amex charge volume of less than $3 million may be eligible.

Directly with Amex, your pricing comes from your agreement with American Express. Amex pitches this route to "National and Regional Businesses or Small Businesses who prefer to accept directly" and promises "competitive pricing opportunities," without publishing the numbers.

The eligibility test is national. A cafe in Miami and an accounting office in Boston face the same under-$3 million test.

Not sure which route you're on? Look at who you signed with. If Amex acceptance came as part of your processing agreement and your provider quotes your Amex rate, you're accepting through a provider. If you signed an agreement with American Express itself, you're direct. If you still can't tell, your processor will know, and it's a fair question to ask on your next call.

What does Amex publish about its fees, and what doesn't it?

Amex publishes plenty of rules and very few US prices. Here's what you can find on its site:

• The OptBlue eligibility threshold, and the fact that providers set OptBlue rates.
• The Merchant Operating Guide. Its April 2026 edition says it "is intended for use by Merchants that have entered into a legally binding Agreement with a Merchant Services Provider" (American Express Merchant Operating Guide).
• Notice that the Merchant Regulations for US merchants "are published twice a year, in April and October" (American Express).
• Acceptance claims, such as Amex's statement that it "can be accepted at 99% of places in the U.S. that accept credit cards" (American Express).

What we couldn't find is a public table of US merchant rates. Amex's US merchant pages send you to a provider for OptBlue pricing, or to Amex itself for direct pricing. So unlike Visa and Mastercard interchange, which you can look up in published schedules (see our guide to what interchange fees are), your Amex cost is only visible in your own quote or statement.

That makes the quote stage your best chance to pin it down. Ask for the Amex rate, the per-transaction fee and any Amex-specific fees as separate lines, the same way you'd ask for Visa and Mastercard pricing, and get them in writing.

Canada is an interesting contrast. Amex's Canadian site publishes the wholesale discount rates and network assessment fees it charges OptBlue participants there, and explains that in the program the participant "sets the total pricing (rate and fees) that the merchant will pay for accepting American Express Cards" (American Express Canada). That page doesn't apply to US merchants. It does show how OptBlue pricing is built there: Amex charges the provider a wholesale rate and network fees, and the provider sets the total price you pay.

Can you surcharge American Express cards?

Amex's rule is about equal treatment. In its Merchant Operating Guide, merchants in the US (along with Canada, APAC and LAC) must not "impose any restrictions, conditions, disadvantages, or fees when the Card is accepted that are not imposed equally on all Other Payment Products, except for electronic funds transfer, cash, or check" (American Express Merchant Operating Guide).

In plain terms, you can't single out Amex. Any fee you put on Amex has to apply equally to the other payment products the rule covers.

The same section lets US merchants offer discounts or in-kind incentives for paying with cash, ACH funds transfer, check, debit card or credit card, as long as (to the extent applicable law requires) the terms are clearly and conspicuously disclosed, the offer is open to all prospective customers, and it doesn't differentiate by issuer or, except where a state statute allows it, by card network.

Visa and Mastercard set their own limits, and they differ from each other:

Those come from Visa's US merchant surcharge Q and A and Mastercard's surcharge rules page.

The Amex section we quoted doesn't say how its equal-treatment wording fits with the Visa and Mastercard bans on surcharging debit cards. Get your processor's answer in writing before you set anything up, and check your state's law too. Our guide to credit card surcharging rules by state is a starting point, our comparison of dual pricing and surcharging covers the alternative, and our surcharging program handles compliance, disclosure and setup.

One more moving piece. Visa says the proposed settlement in the interchange class action would give merchants "more options to surcharge, including if they do not surcharge other credit networks" (Visa). The court granted preliminary approval on June 9, 2026 (Visa Form 10-Q), but preliminary approval isn't final approval, and Amex's own rule is a separate matter.

Is accepting American Express worth it?

Amex makes its case with figures from its own merchant pages. It says the average transaction size on Amex cards was 58% higher than on cards on other networks, and that annual spend on Amex cards was on average 3.1 times that of cards on other networks (American Express). Those are Amex's numbers for card spending overall, not a promise about your shop.

Here's how we'd decide:

1. Count how often customers ask for Amex, or walk away when you don't take it. That's your real demand signal.
2. Find your Amex cost. If you already accept it, divide last month's Amex fees by your Amex sales. If you don't, get a quote.
3. Do the break-even math. Say Amex costs you 0.60 percentage points more than your blended Visa and Mastercard rate, and you'd run $4,000 a month on Amex. The extra cost is $24 a month. At a 40% gross margin, you need $60 a month in sales you'd otherwise lose to cover it. These are made-up numbers, so plug in yours.
4. Weigh the result against the awkward moment of telling a customer you don't take their card.

At those example numbers, keeping two $40 sales a month that would otherwise walk out the door covers the extra cost. If almost nobody asks and your margins are thin, it's fair to pass. If you're somewhere in between, the math settles it in five minutes.

How does American Express show up on your statement?

If you accept through OptBlue, your provider sets and bills your Amex pricing, so the Amex lines sit on your provider's statement next to Visa and Mastercard. Look for the Amex sales count and volume, the Amex rate, any per-transaction fee and any Amex-specific fees.

Then work out your Amex effective rate on its own: Amex fees divided by Amex sales. For example, $118.00 in Amex fees on $4,200.00 in Amex sales is 2.81%.

Now put it next to your Visa and Mastercard number. Say those cards cost you $1,560 on $68,000 in sales, an effective rate of 2.29%. At that rate, your $4,200 in Amex sales would have cost about $96.35, so Amex is costing you about $21.65 a month more than your other cards. That's the figure to plug into the break-even math above. Our page on credit card processing fees explains the other layers you'll see on the statement.

A few questions worth asking your provider:

• Is my Amex price a single rate, or Amex's cost plus a markup?
• Are network fees listed separately?
• Has my Amex rate changed in the last year, and how much notice do I get before it changes?

If you accept directly with Amex, your rate comes from your agreement with American Express, so put those questions to Amex rather than to the processor that handles your Visa and Mastercard sales. Our guide to reading a merchant statement helps with the rest of the page.

Common mistakes with American Express fees

• Assuming Amex is always your most expensive card. With OptBlue, your provider sets the Amex rate, and premium Visa and Mastercard cards aren't cheap either. Visa's April 2026 schedule lists Visa Signature Preferred at 2.10% + $0.10 in person (Visa), and Mastercard's 2026-2027 schedule lists World Elite at 2.30% + $0.10 for its Merit III Base rate (Mastercard). Check your own numbers before you decide.
• Putting a fee on Amex only. Amex's guide bars fees on the Card that aren't imposed equally on all other payment products, apart from electronic funds transfer, cash and check.
• Lumping Amex into one blended rate. If you never calculate Amex on its own, you can't tell whether it's costing you more than your other cards, or by how much.
• Reading the Visa and Mastercard settlement as an Amex change. It's a Visa and Mastercard settlement. Amex's rules come from Amex.
• Signing a contract without asking how Amex is priced. Your provider sets that rate, so it belongs in the quote like every other number.

A checklist for your Amex fees

• You know whether you accept Amex through OptBlue or directly.
• You know your Amex rate and per-transaction fee, and whether either can change during your contract.
• You know of any Amex-specific monthly or annual fees.
• You've calculated last month's Amex effective rate.
• If you want to add a card fee, you've checked Amex's rule, the Visa and Mastercard limits, and your state's law.
• You've counted how many customers asked to pay with Amex last month.

The next step

Our free statement review starts with a recent statement from you. We'll separate your Amex costs from your Visa and Mastercard costs and show the effective rate on each. If you'd rather talk it through first, contact us.