Alexa rankings of the main credit card processors
 

I might have forgot somes... Dont hesitate to add them here

Credit Card Processors and their alexa ranking :
CCBill.com - 790
Allopass.com - 5,446
Verotel.com - 11,792
Localbillinglimited.com - 16,773
epoch.com - 18,742
wnu.com (epoch) - 24,981
netbilling.com - 47,490
Segpay.com - 50,562
365billing.com - 105,000
netcash.com - 130,000
ccbilleu.com - 296,000
Zombaio.com - 446,000

Of course this is not completely accurate and this does not include all affiliate programs using their own merchant account and join pages to process. However this gives a rough idea of the traffic on their domains.

Zombaio? Is this african billing for Zimbabwe?

last time I searched for the term "ccbill" zombaio was in the sponsored links on google :helpme

Doesn't take into account non adult purchases.

i think they are english
they have been advertising on xbiz for a few months now

yes they are still doing it !