[sgerenser]

The difference is not that high. In fact, my understanding is “Visa Signature” and “World Mastercard” (which are most of the premium credit cards) normally cost about the same as Amex. At worst it may be about 1% more not double.

[arcdigital]

You're correct, take a look at my other comment for a breakdown.

[kuschku]

Compared to european payment cards with their 0.125% total fees, Amex' 6-7% is a steep ask.

[ceejayoz]

The highest Amex interchange rate is about 3%. https://www.creditdonkey.com/interchange-rates.html

[kuschku]

Merchant rates from local payment processors are: 0.125% for Girocard, 1.39% for VISA/MasterCard, 6.2% for AMEX

[arcdigital]

It's nowhere near 6-7%. See my other comment for more details.

[troupe]

Payment cards that only have a 0.125% fee? Are you talking about a debit card or a payment / credit card?

[kuschku]

"payment cards" includes debit cards, credit cards, and other types of cards that can be used for payments, such as the German girocard standard. There's no meaningful difference between these products if your locale has working consumer protection laws.

The payment processors I'd be looking at offer merchants rates of 0.125% for girocard, 1.39% for VISA/MasterCard, and 6.2% for AMEX.