EU:

https://stripe.com/nl/pricing https://stripe.com/de/pricing https://stripe.com/gb/pricing

etc.

US and Japan for example: https://stripe.com/us/pricing https://stripe.com/jp/pricing ( no fixed )

Must have something to do with: http://europa.eu/rapid/press-release_IP-15-4585_en.htm

Visa and MC are responsible for that, and Visa and MC will say that the regulatory frameworks in these countries dictate that level of pricing.

The interchange rate is capped in the EU, but not cross-border.