Shopify now has support for the NELiX TransaX payment gateway. NELiX TransaX supports US based merchants processing in USD. The gateway supports many major credit card brands including VISA, MasterCard, American Express, and Discover.

NELiX TransaX was founded in December 2006. A quote from their site:

Our philosophy has always been to treat all of our merchants as partners. If your business is successful, we will also be successful. This philosophy permeates in everything we do. NELiX® TransaX enters this industry with a unique perspective. Coming from the technology sector, we have the ability to look at the entire puzzle, and not just one small piece of it. We are here to change the way merchants view their payment processing provider.

Thanks to Mike Mangino of Elevated Rails for contributing the gateway to ActiveMerchant.