American Express Interchange Fees, Explained
Here's the twist most articles skip: technically, Amex doesn't charge interchange at all — and the rate most small businesses pay for Amex is set by their processor, not by American Express.
The 30-second answer
Interchange is a fee paid between banks on open-loop networks like Visa and Mastercard. American Express runs a closed-loop network — it typically acts as both the card issuer and the merchant's network — so instead of interchange, Amex charges merchants a "discount rate." That's Amex's own term, straight from its merchant agreement.
Most small businesses don't even pay Amex directly. Under the OptBlue program, Amex charges your payment processor wholesale rates, and the processor adds a markup and sets the rate you actually pay — just as it does for every other card brand.
And unlike Visa and Mastercard, Amex doesn't publish OptBlue wholesale rates publicly — they vary by industry and ticket size, and your processor's markup sits on top. The only place your real Amex cost exists is your own statement. The rest of this page shows youwhat you can actually control.
Why "Amex Interchange" Is a Trick Question
On a Visa or Mastercard transaction, four parties split the work: the bank that issued the card, the network, your processor, and you.Interchange is the wholesale fee that flows to the card-issuing bank, and the network publishes those rates in a public table. Your processor pays interchange, then charges you interchange plus assessments plus its own markup.
American Express collapsed that chain. In its classic model, Amex issues the card and runs the network, so there's no separate bank to pay an interchange fee to. What merchants pay instead is what Amex's own U.S. Merchant Reference Guide calls the Discount — "one of the amounts we charge a Merchant for accepting the Card" — plus any additional fees and assessments under the agreement.
That one structural difference explains almost everything else about Amex pricing: why there's no public Amex interchange table, why comparisons with Visa and Mastercard get muddled, and why the answer to "what does Amex cost?" depends on how you accept it. For the vocabulary behind all of this — interchange, assessments, discount rate — our merchant services glossary has plain-English definitions.
OptBlue vs. a Direct Amex Agreement
Who sets your Amex rate depends entirely on which of these two doors you came through — and for most small businesses, it's the first one:
OptBlue — Amex through your processor
- You sign one agreement with your payment processor, which handles Amex pricing, statements, and support alongside Visa and Mastercard.
- American Express charges the processor wholesale program rates; the processor adds its own markup and sets the rate you actually pay. In Amex’s own words: "Processors set the rate for American Express acceptance – just like they do for all other card brands."
- Eligibility is capped by Amex charge volume. As of April 17, 2026, the U.S. threshold is $3,000,000 in estimated annual Amex charge volume for most industries (a handful of categories — charity, healthcare, education, government, insurance, residential rent, utilities — have no threshold).
Direct agreement with American Express
- You sign a card acceptance agreement with American Express itself, and Amex — not your processor — sets your discount rate and pays your Amex deposits.
- Amex may charge additional fees and assessments on top of the discount, and reserves the right to adjust its pricing under the merchant agreement.
- Merchants above the OptBlue volume threshold are required to move to a direct relationship, so growing past it changes who you negotiate with.
Looking for Current Interchange Fees? Here's What Exists
Visa and Mastercard publish their U.S. interchange tables. Visa posts its "Interchange Reimbursement Fees" document on its small-business fees page, and Mastercard posts its U.S. Region Interchange Programs and Rates document (the current edition covers 2026–2027). Those tables are dense — hundreds of categories by card type, industry, and how the card was presented — but they're public, and they're the wholesale floor under every Visa and Mastercard transaction you run.
American Express publishes no equivalent table. Amex's OptBlue materials confirm the structure — wholesale program rates to the processor, markup set by the processor — but not the wholesale numbers themselves. OptBlue costs vary by industry and ticket size, and the markup on top varies by processor. Any site quoting you "the Amex OptBlue rate table" is republishing leaked or estimated figures, not an official Amex price list — which is why we don't print one here.
The practical consequence: for Visa and Mastercard you can check a processor's honesty against a public table, but for Amex the only source of truth is your own merchant statement. Our walkthrough on how to read a merchant statement shows where Amex charges hide, and our processing fee calculator turns those line items into the effective rate you're really paying.
Why Amex Has Historically Cost Merchants More
Amex's premium reputation among merchants isn't a myth, and the reason is the structure you just read about. A closed-loop discount rate has to fund what three separate parties fund on an open-loop network — network operations, issuer economics, and the famously rich cardmember rewards — all out of one merchant-side charge. Amex built its business on higher-spending cardholders and prices acceptance accordingly: the pitch to merchants has always been bigger tickets in exchange for a bigger rate.
Whether that trade still costs you more today is an empirical question. Under OptBlue, your processor's markup can matter as much as Amex's wholesale cost — a processor that pads its Amex margin can make Amex look worse than it is, and a transparent one can make the gap surprisingly small. That's a statement question, not a reputation question.
One more piece of context worth knowing: accepting Amex comes with brand-treatment rules. Amex's U.S. Merchant Reference Guide bars merchants from discouraging cardmembers from using the card, from indicating a preference for other cards, and from imposing "any restrictions, conditions, disadvantages, or fees" on Amex acceptance "that are not imposed equally on all Other Payment Products" — with cash, check, and electronic funds transfer explicitly carved out. If you take Amex, you've agreed to treat it like every other card on the counter.
What You Can Actually Control About Amex Costs
You can't negotiate with a rate table Amex doesn't publish — but every one of these levers is in your hands. (For the pricing-model piece, our credit card processing fees comparison goes deeper on interchange-plus vs. flat-rate vs. tiered.)
Know which program you’re actually in
If Amex transactions appear on the same statement as Visa and Mastercard and you never signed paperwork with American Express directly, you’re almost certainly on OptBlue — which means your processor, not Amex, decided your rate. That’s the rate that can be negotiated or shopped.
Put Amex on a pass-through pricing model
On interchange-plus (pass-through) pricing, the processor’s markup is broken out from the network’s wholesale cost on every transaction — Amex included. On flat-rate or tiered pricing, the markup on Amex is invisible. If you can’t see the split, you can’t evaluate it; our guide to reading a merchant statement shows where to look.
Compare the whole pricing model, not one rate
A processor quoting a low Visa rate can make it back on Amex, where fewer merchants check. Judge processors on how they price every network — the markup they take on Amex under OptBlue is as negotiable as any other line, but only if you ask about it explicitly.
Mind the surcharging equal-treatment rule
Amex’s merchant rules prohibit imposing "any restrictions, conditions, disadvantages, or fees when the Card is accepted that are not imposed equally on all Other Payment Products" (cash, check, and electronic funds transfer excepted). Practically: a surcharge program that skips or singles out any card brand risks violating Amex’s rules — and state surcharge laws add their own limits. Discounts for cash remain expressly permitted, with disclosure conditions.
Surcharging and checkout-pricing rules touch state law and your card acceptance agreements. This page is general information, not legal advice — confirm the current rules for your state and your contracts before making changes.
How Payment USA Handles Amex Pricing
Payment USA merchants accept all major card brands — Visa, Mastercard, American Express, and Discover — oninterchange-plus pricing, the model that separates the card network's cost from our markup on every transaction. We use interchange-plus because it's the only model where hiding fees is structurally impossible: you see every line item, every month, network charges broken out from ours.
For a card brand whose wholesale rates aren't public, that transparency is the whole game. If you're not sure what you're paying on Amex today, send us a recent statement — our free statement review names every charge on it, Amex included, and shows you what the same volume looks like priced our way.
Amex Fee Questions, Answered
What are American Express interchange fees?+
Strictly speaking, there aren’t any. Interchange is a fee paid between banks on open-loop networks like Visa and Mastercard, where one bank issues the card and another serves the merchant. American Express is closed-loop — it typically plays both roles itself — so it charges merchants a "discount rate" instead. When people search for Amex interchange fees, what they usually want is the effective rate merchants pay to accept Amex, which is set either by Amex directly (large merchants) or by your processor under the OptBlue program (most small businesses).
What is Amex OptBlue, and am I on it?+
OptBlue is American Express’s program for reaching smaller merchants through payment processors: Amex sets wholesale program rates for the processor, and the processor adds its markup and manages your pricing, funding, and support. If you accept Amex but signed up through your processor — one application, one statement, one deposit relationship — you’re on OptBlue. Merchants above the volume threshold ($3,000,000 in estimated annual Amex charge volume as of April 2026, for most industries) move to a direct agreement with American Express.
Why does American Express cost more than Visa or Mastercard?+
Structurally, Amex’s discount rate has to cover what interchange, network assessments, and issuer economics cover separately on open-loop networks — including the rewards its cardholders earn, which are funded largely from merchant pricing. Amex’s cardholder base also skews toward higher-spending consumers and businesses, which is the value proposition Amex prices for. Whether Amex actually costs your business more today depends on your OptBlue markup and pricing model, which is why the answer lives on your statement, not in a published table.
Can I add a surcharge to American Express cards?+
Only as part of a program that treats every card network the same. Amex’s merchant rules bar imposing fees on Amex acceptance that aren’t imposed equally on all other payment products (with cash, check, and electronic funds transfer carved out), so surcharging Visa and Mastercard while sparing Amex — or vice versa — runs afoul of the rules. State law adds separate restrictions on whether and how much you can surcharge at all. Offering a discount for cash is expressly permitted if it’s disclosed and offered to all customers. This is general information, not legal advice — review your state’s rules and your merchant agreements before changing checkout pricing.
Sources
All external facts on this page were checked against these primary sources, observed 2026-09-03. Networks revise their programs and thresholds over time.
- American Express — OptBlue Program Overview (agent/processor page): processor-set pricing, $3,000,000 ECV threshold effective April 17, 2026, no-threshold categories
- American Express — Merchant Reference Guide, U.S. (October 2021 edition, posted at americanexpress.com): "Discount" definition, Section 3.2 "Treatment of the American Express Brand" equal-treatment and cash-discount rules
- Visa — "Interchange & Fees" small-business page, with the downloadable Visa USA Interchange Reimbursement Fees PDF
- Mastercard — Merchant interchange rates page, with the 2026–2027 U.S. Region Interchange Programs and Rates document
Spot something outdated? Email us at sales@paymentusa.com and we'll fix it.
What Are You Really Paying on Amex?
There's no public table to check — but there is your statement, and we read those for free. Send us a recent one and we'll break out your Amex costs, your processor's markup, and every other fee on the page, each one named and explained. If your pricing is clean, we'll tell you that too.