American Express processes roughly 22% of all global card transactions and its cardholders spend 2-3x more per visit than Visa or Mastercard users. For UK businesses, accepting Amex means access to over 102 million high-spending cardholders worldwide.
We rate Amex Merchant Services 6.5 out of 10. The access to premium-spending customers is real, but the higher transaction fees (typically 1.7%-3.5%), limited transparency on pricing, and mixed merchant reviews hold it back. Most UK small businesses should accept Amex through their existing payment provider via OptBlue rather than signing a direct contract.
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This guide explains how Amex merchant services work, what it costs, the difference between direct accounts and OptBlue, and whether accepting American Express makes financial sense for your business. For a broader view of UK payment options, see our merchant accounts hub.
- Amex cardholders spend 2-3x more per transaction than Visa/Mastercard users - accepting Amex gives access to affluent customers with average basket values of £85-120 versus £35-50 for other cards
- Merchant fees of 1.5-3.5% are 50-100% higher than standard card processing - the premium is justified only when the higher transaction values and customer loyalty offset the extra cost
- 22% global market share with 140 million cards in circulation worldwide - declining Amex means turning away 1 in 5 potential card-paying customers, particularly in premium retail and hospitality
- Settlement is typically 1-2 business days faster than traditional merchant accounts - Amex pays merchants directly rather than routing through acquiring banks, improving cash flow for smaller businesses
- Best for premium retailers, restaurants, and professional services above £50 average spend - if your typical transaction is under £20, the higher fees will erode margins without the average-spend uplift
How American Express Merchant Services Work
American Express runs a closed-loop network – acting as both card issuer and payment processor – which means higher merchant fees but access to premium-spending cardholders.
Unlike Visa and Mastercard (which use an open-loop system with separate issuing banks and acquiring banks), Amex controls the entire transaction chain. It issues the card, processes the payment, and settles with the merchant. This closed-loop model gives Amex more control over rates and cardholder data, but historically made it more expensive for merchants.
Crucially, Amex is exempt from the UK’s interchange fee caps (0.3% for credit, 0.2% for debit) that apply to Visa and Mastercard. This is why Amex fees are higher – there’s no regulatory ceiling.
UK businesses can accept Amex through two routes:
- Direct Amex merchant account – contract directly with American Express. Best for high-volume Amex merchants.
- OptBlue programme – accept Amex through your existing payment provider (Square, SumUp, Worldpay, etc.) with no separate contract. Best for most small businesses.
American Express Fees and Costs
Amex doesn’t publish fixed rates – fees are negotiated per merchant, typically ranging from 1.7% to 3.5% depending on industry and volume.
American Express doesn’t publish a standard rate card. Your fee depends on your industry, annual transaction volume, and whether you’re on a direct contract or going through OptBlue. You can call 0800 339 911 for a tailored quote.
Direct Account Costs
| Cost Type | Amount |
|---|---|
| Transaction fee | Typically 1.7%-3.5% (negotiated) |
| Setup fee | £0 |
| Monthly account fee | £0 |
| Payment gateway | From £15/month (100 transactions) |
| Per-transaction gateway fee | 7p-12p |
| Contract length | Varies (negotiate) |
The absence of setup fees and monthly charges is a genuine advantage over many traditional merchant account providers. You only pay when you process an Amex transaction. For businesses with seasonal or unpredictable Amex volumes, this means no wasted fixed costs.
OptBlue Costs via Third-Party Providers
Most UK small businesses accept Amex through OptBlue – their existing payment provider bundles Amex acceptance alongside Visa and Mastercard. This is simpler, cheaper for low volumes, and requires no separate contract.
| Provider | Amex Fee | Monthly Fee | Contract |
|---|---|---|---|
| Square | 1.75% (same as all cards) | £0 | None |
| SumUp | 1.69% (same as all cards) | £0 | None |
| Worldpay | From 2.75% | £19.95+ | 0-36 months |
| Elavon | 2.65%-3.5% + 19p | £10+ | 3 years |
| Global Payments | From 3.3% + 20p | £10+ | 12-36 months |
Notice that flat-rate providers like Square and SumUp charge the same rate for Amex as for any other card – making them the simplest and often cheapest way to accept Amex for small businesses. No separate agreement, no extra fees, no admin overhead.
Features and Tools
Amex provides a merchant portal with real-time transaction monitoring, dispute management, 12-month reporting, and dynamic currency conversion across 127 currencies.
Direct Amex merchant accounts come with the My Merchant Account portal, which offers real-time transaction monitoring, downloadable settlement reports, and 12 months of payment history. The dispute management system sends daily alerts and lets you upload evidence directly through the portal.
Dynamic Currency Conversion is a standout feature for businesses serving international customers. It supports 127 currencies across 170+ countries, showing prices in the customer’s local currency. This is especially valuable for e-commerce, tourism, and hospitality businesses.
Amex Internet Direct lets merchants process transactions straight through Amex servers via XML API, bypassing third-party processors. Amex claims this can reduce per-transaction costs by up to 1%. You’ll need strong PCI DSS compliance to use it.
Support is available 24/7 by phone for account holders (in English, French, and Spanish). Non-members get six-day-a-week support. Amex also provides marketing materials and signage to help businesses advertise Amex acceptance.
Who Should Accept American Express?
Accept Amex if your customers include premium spenders, international visitors, or corporate buyers – skip it if your margins are tight and few customers ask for it.
Accept Amex if:
- You serve premium customers – hotels, fine dining, luxury retail, and professional services attract Amex users who spend more per visit
- You have international customers – Amex’s global cardholder base and dynamic currency conversion are valuable for tourism and e-commerce
- You already use a flat-rate provider – Square and SumUp charge the same 1.69-1.75% for Amex as any other card, so there’s zero cost to accepting it
- Your competitors don’t accept Amex – you gain a differentiation advantage with Amex-preferred customers
Skip Amex if:
- Margins are tight – if you’re already paying 2.5%+ on a traditional merchant account, adding Amex at 3%+ eats into profit
- Few customers ask for it – if you rarely get asked “Do you take Amex?”, the admin overhead isn’t worth it
- You’d need a separate contract – the hassle of managing two merchant agreements, two sets of reports, and two settlement schedules only makes sense at high Amex volumes
Pros and Cons
Amex gives merchants access to high-spending cardholders but charges higher fees than Visa/Mastercard – OptBlue via flat-rate providers eliminates most downsides.
Our Verdict
We rate Amex Merchant Services 6.5/10 – valuable for businesses with premium or international customers, but unnecessary complexity for most small businesses.
Access to high-spending cardholders but higher fees — most small businesses should accept via OptBlue through existing providers
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The case for accepting American Express depends entirely on your customer base. If Amex cardholders make up a meaningful share of your customers – or if you serve tourists, corporate buyers, or premium shoppers – the higher spending per transaction can more than offset the higher fees.
For most UK small businesses, the simplest path is to accept Amex through a flat-rate provider like Square (1.75%) or SumUp (1.69%) via OptBlue. Same fee as any other card, no separate contract, no admin overhead. Only consider a direct Amex contract if you process high volumes of Amex transactions and can negotiate a competitive rate.
For a full comparison of card payment providers, see our guide to the best card machines for small business or compare card machine costs. You can also read our dedicated Square review and SumUp review for more detail on those providers.
