Alipay has already been working in beta mode with retailers such as luxury deal site Gilt.Com, The Gap and H&M.
"We want to demystify the Chinese consumer for U.S. retailers," said Jingming Li, president and chief architect of Alipay US, which has a US base in Santa Clara, California, alongside its affiliate Alibaba.
Alipay targets English-reading young professionals in the four biggest regions of China (it doesn't offer a translation service).
And it comes as the payment-services category is heating up with new offerings including Apple Pay, and eBay's plan to split off its PayPal payments business next year.
More From This Section
Cross-border shopping is growing. PayPal, which also offers cross-border payment services, estimates that by 2018, there will be 130 million cross-border shoppers spending over USD 300 billion globally.
It is possible for a Chinese customer to make purchases on US retail sites without ePass, but the process involves using an international credit card and typically brings mark-ups on Western products. EPass aims to ease the "friction" of international purchases, Li said.
Alibaba started Alipay in 2004 to facilitate payments on its web sites and spun off the unit in 2011 into a company controlled by Alibaba CEO Jack Ma. Because it was spun off, Alipay was not part of Alibaba's mammoth USD 25 billion IPO in September, the largest ever.