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The heated mobile-payment wars are expanding...beyond mobile. Zong, one of the start-ups hoping to capture the market for online micropayments billed to a mobile phone, announced Thursday the debut of "Zong Plus," which lets members link credit or debit cards to their Zong accounts.

It's another move that pits Zong against Boku, a competitor that launched right around the same time with broader global reach--last month, it announced its expansion to subscription-based services in addition to on-demand micropayments.

At launch, Zong Plus is compatible with Visa, MasterCard, Discover, and American Express accounts,

"Today you've got a variety of products for different kinds of payments and services," vice president of product management Hill Ferguson told CNET News. "You've got PayPal. You've got several of us in this mobile payment arena. What Zong Plus does is just elevates us into a different mobile payment type."

On the surface, adding traditional credit card payments seems to defeat the purpose of Zong, which inherently tries to offer a simpler and more universal alternative for small payments (cell phone carriers put a cap on how much can be spent). But Ferguson said that Zong Plus, which is free for participating merchants to upgrade to, "is an optional feature for consumers who have payments cards and feel that the incentive that we offer is powerful enough for them to open up their wallet and type in the information."

What's that incentive? Part of Zong Plus is a loyalty program that will rack up points much like airline miles. In a participating game or other micropayments-linked application, this means that when enough points have been accrued, the member may be alerted that their next purchase is "on the house."

Whether it will work is still unclear. Zong has deals with social gaming and virtual-world companies like OMGPOP, IMVU, and Gaia Online, but there are still enough rivals offering similar packages as well as the off chance that a big e-commerce player like PayPal could launch a service of its own and snuff out the competition.

The announcement comes in advance of the Virtual Goods Summit in San Francisco, where pretty much any start-up involved in the latest generation of e-commerce (read: magic swords and Mafia dons) will be showing off its wares. Plenty of other companies will be making announcements, too, presumably some in the payments space.

Mobile payment start-up Zong is extending its product to include subscription-based services, the company announced Tuesday.

Gaming site OMGPOP and News Corp.-owned photo-sharing site Photobucket have signed on as launch partners.

So here's what this means: instead of entering credit card billing information, subscribers to OMGPOP and Photobucket can bill their subscriptions directly to their phone bills by entering their cell phone numbers and then responding to a confirmation code. Previously, the Zong service could only be used for one-at-a-time micropayments rather than subscription-based services.

With Zong's new development, which is currently available only on U.S. carriers (and ideally international ones soon, the company said), it can process monthly subscription payments of up to $9.99. Bigger transactions are tougher because of the company's complicated relationships with cell phone carriers.

Opening up its mobile payments to subscription services may give Zong an advantage in its close rivalry with Boku, another start-up offering a very similar pay-by-mobile-number service. The two have taken slightly different approaches to carrier relations, which gave Boku a bigger global reach at its launch--and it's continued to grow fast.

Zong, meanwhile, says that more than 10 million unique users have used the service to process payments so far.

Mobile payment start-up Boku, integrated into social game Puzzle Pirates.

(Credit: Boku)

Some would say our cell phone bills are high enough already. But two emerging start-ups are hoping to make mobile devices a hub for one of the hottest trends on the Web: micropayments.

Enter Boku, which launched officially on Tuesday with a whirlwind of announcements: its public launch after a year in stealth mode, its acquisitions of smaller companies Paymo and Mobillcash, and a $13 million round of venture funding led by Benchmark Capital with contributions from Index Ventures and Khosla Ventures.

A social-networking, gaming, or retail Web site can install Boku as a payment platform much like PayPal. But instead of entering a credit card number, members enter their cell phone numbers. A confirmation text message is sent to the cell phone, which the member must reply to for security purposes. No registration is required, and the charge goes to that member's phone bill. It's quite an idea, and one with invariably will raise plenty of questions about economics, social-media revenue, and the big one--security.

"We're focused on getting to as many publishers and merchants as possible," said Ron Hirson, an AT&T veteran who leads up marketing at Boku. The start-up is launching with carrier compatibility in 53 countries, integration into a number of social apps (including the ubiquitous "Mafia Wars"), and an official partnership with Hi5, an entertainment-focused social network with a big foothold in a number of Latin American countries. "We want to make this value proposition, this technology that we've built, and get to all the social games, all the casual games people play, (and) MMOs."

But Boku already has an extremely close competitor: Zong, which first launched in the U.S. in the spring of 2008, and which offers the same strategy of facilitating micropayments with a cell phone number, and which has already set up shop in virtual-goods havens like RockYou's social-net apps, teen site MyYearbook, and avatar company Meez.

With both companies now launched, now it's time for the land grab.

"I think we're on for a good boxing match in the ring," Zong CEO David Marcus said in an interview with CNET News.

It looks like it'll be quite the rivalry, since this is a situation where both companies want to achieve PayPal-like levels of ubiquity. Zong says it's more user-friendly; Boku touts a broader global reach. Boku says it's more customizable for merchants that want to install it; Zong says it has an advantage by partnering directly with carriers whenever possible and avoiding aggregation companies that effectively resell carrier relationships.

"We win in the fact that we don't use aggregators in 80 percent of our carrier connections...direct, with no intermediary whatsoever," Marcus said. "These aggregators were basically built to service ringtone companies and wallpaper companies, and have a very different infrastructure than the infrastructure that we've built for payment."

That strategic decision to avoid aggregators, Marcus added, was actually what kept Zong away from purchasing Paymo, which it had been considering before Boku eventually snapped it up. "Until a few weeks ago we were looking at acquiring Paymo as well and passed for one main reason," Marcus said. "They have great coverage in developing-world countries but only work through aggregators, and that's the case with Mobillcash as well."

But its willingness to partner with carrier-relationship aggregators has given Boku the advantage in reach, something that Zong's Marcus acknowledged (though he says it's adding two or three new countries each month).

"We want to build this global standard for mobile payments, and you need the global reach for sure, and we have that immediately," Hirson said of Boku, adding that it has twice the reach of its nearest competitor.

So why is this such a big deal that two start-ups have gotten so gloves-off about wanting to seize market share? With news stories galore about the kinds of dollars that some gaming companies are raking in with the sales of virtual goods--just read any headline about Zynga--the idea of making it easier for people to pay for small in-game transactions is quite appealing. Venture funding for virtual goods-related companies reached nearly $70 million in the first quarter of this year. And both companies say they're looking forward to the extension of Facebook's internal payment system to developers, hoping that they can integrate their products into the platform for even broader reach.

There's another angle to it: social networks and gaming sites are now a global phenomenon. In many countries, and not just those in the developing world, credit cards are far less commonplace than in the U.S. From what it looks like, the anticipated "Pay with Facebook" system may require a credit or debit card. The fact that Zong and Boku don't require either registration or a credit card could make it easier for more people to spend more money online, as much as it may sound an alarm with security freaks.

They also both speculate that their rivalry will likely continue to be a two-horse race, to use another terrible competition metaphor. Dealing with the security infrastructure required, not to mention carrier partnerships, is difficult for start-ups and established companies alike.

"The barrier to entry is fairly high," David Marcus said.

Hirson was a little more vocal about the difficulty of building a company in the space. "I would not wish upon my worst enemy the idea of trying to connect to hundreds of carriers and aggregators," he said. "It is extremely challenging dealing with the numbers of Byzantine rules you have in each country."

It's too early to tell which company will win--especially since market share is dependent on game developer and social-network preferences much more than consumer choices--if there even proves to be a winner. As inconceivable as it may seem right now, the bottom could still fall out of the virtual goods craze. And as consumer habits in both online payment and cell phone use change, so could the chances for success of a start-up that will face such extensive security and expansion challenges.

"We know we're going to attract all kinds of unsavory characters trying to do bad things, and we're trying to build ahead of that," Ron Hirson said.

But either way, this is a space to watch as social networks and gaming companies jump further into the micropayments craze.

"The space is definitely growing, and it's in hyper-growth stage," Marcus said, "and you're going to have major players that are going to enable mobile payments in the very near future."