American Express is expanding its cash reload network for its Serve prepaid cards through a partnership with Wal-Mart Stores Inc.

"We're bringing the total of free cash loading location to about 19,000, making us the largest cash reload network in the country," says Stefan Happ, senior vice president and general manager of online and mobile at Amex. Walmart is the largest retailer in the world and the largest distributor of reloadable prepaid cards in the U.S., he says.

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