In USA for each 100 online money transactions, how many of them are made through credit card, wire transfer, paypal, western union, and others? Where can I find cool statistics about ecommerce in USA?
It varies a lot based on what is being sold and how the options are presented. Generally popularity goes credit card, then paypal, and realistically nothing else is used enough to really measure. Any sort of echeck or western union are hardly used in the US. I would guess that 90% of transactions online are credit card or paypal. After that there's a number of other 3rd party services like checks, other 3rd party processors, ACH, western union, etc.. If you want actual statistics which most likely wont be free, I would check some like: http://www.nielsen.com/
Everyone uses credit card, paypal is with ebay.. WU/wire etc are more for o/s business transactions or so