Chase CSP Higher than Arrivals+
Live example just a bit ago.
Purchase=690 Euros
Rate per xe.com (Euros to Dollars) 1.13950
Dollar price using XE rate: 786.26
Dollar price used by Barclays via Arrivals+(Mastercard)= $791.90
Dollar price used bu Chase via CSP (Visa)=$789.28
I wound up with this comparison since Barclays rejected the charge but it still sits in my authorized transactions, for now.
This is not in line with my prior experience, which showed CSP to be between .25 and .70% higher after the forex conversion.