If you've ever considered dropping American Express from your accepted cards — or if you've already done it — you're not alone. For years, Amex has had a reputation as the expensive card network. Higher rates, higher fees, and a more difficult relationship with merchants than Visa or Mastercard.

Some of that reputation is still deserved. But the landscape has shifted, and the math might not say what you think it says.

What Amex actually costs

Amex interchange has historically been higher than Visa and Mastercard. For a typical retail transaction:

  • Visa/Mastercard consumer credit — roughly 1.5%–2.0% + $0.10
  • American Express OptBlue — roughly 1.8%–2.5% + $0.10 (for merchants under $1M annual Amex volume)

The gap used to be much wider. Before Amex introduced its OptBlue program in 2015, small merchants paid Amex's direct merchant rate, which could hit 3.5% or more. OptBlue brought Amex pricing through your regular processor at rates much closer to Visa/Mastercard.

For merchants on flat-rate pricing (Square, Stripe), there's often no difference at all — you pay the same 2.6% + $0.10 or 2.9% + $0.30 regardless of card brand.

The hidden cost of refusing Amex

Here's the part most merchants don't calculate: what does it cost you when an Amex cardholder walks away?

American Express cardholders tend to spend more per transaction than Visa or Mastercard users. Amex's own data shows their cardholders spend 2–3x more on average. They also tend to be higher-income, more brand-loyal, and more likely to return to businesses that accept their preferred card.

If a customer walks up to your counter with a $200 purchase and you don't take Amex, three things can happen:

  • They pull out a Visa and you process the sale (best case — you save maybe $1-2 in fees)
  • They leave and buy from a competitor who accepts Amex (worst case — you lose $200 in revenue)
  • They buy less because they're using a card with lower rewards (middle case — you lose margin on a smaller ticket)

The question isn't "is Amex more expensive?" It's "is the extra 0.3–0.5% in processing fees worth more than the revenue I'd lose by not accepting it?"

When Amex makes sense

Amex is almost always worth accepting if:

  • Your average ticket is above $50. The higher the ticket, the more revenue you risk losing by turning customers away. A 0.5% difference on a $200 sale is $1. Losing the sale entirely costs you $200.
  • You're in a competitive market. If the restaurant next door accepts Amex and you don't, the customer with an Amex card is going next door.
  • You serve a higher-income clientele. Affluent customers disproportionately carry Amex. Refusing their preferred card is a poor customer experience.
  • You're on flat-rate pricing. If your rate is the same regardless of card brand, there's literally no cost to accepting Amex.

When to reconsider

Amex might not be worth the premium if:

  • You're a very high-volume, low-margin business (gas stations, convenience stores) where every basis point matters and customers will always have a Visa or Mastercard as backup.
  • Your Amex volume is under 2% of total sales. If almost nobody uses it, the extra cost of maintaining it may not be justified.
  • You're on interchange-plus pricing and the Amex rates are significantly higher than your Visa/Mastercard rates. In this case, negotiate directly with your processor — OptBlue rates are negotiable just like your other rates.

How to optimize your Amex costs

If you're keeping Amex (and you probably should), here's how to make sure you're not overpaying:

  • Verify you're on OptBlue. If you process less than $1M per year in Amex volume, you should be on the OptBlue program, where rates flow through your processor like any other card. If you're still on a direct Amex merchant agreement with higher rates, switch.
  • Negotiate. OptBlue rates are negotiable. If your processor quoted you a higher markup on Amex, push back — especially if your Amex volume is significant.
  • Batch daily. Amex transactions downgrade just like Visa and Mastercard if you don't settle within 24 hours.
  • Send AVS and CVV data on card-not-present transactions. This qualifies Amex transactions for better rate tiers, same as Visa/MC.

The bottom line

Amex isn't free, but it's cheaper than losing customers. The merchants who do best with Amex are the ones who accept it as a cost of doing business with higher-spending customers, then optimize the rate rather than refusing the card entirely. Unless your margins genuinely can't absorb an extra 0.3–0.5%, the math almost always favors keeping Amex in the mix.