Digital wallets have long been in the news, but the hottest trend is peer-to-peer payments and apps that help small business owners ditch their cash register.
Visionary start-ups like Square will introduce new payment services this year, while Google plans to get in on the trend by bringing its Wallet to Gmail users.
"Our mission is to make commerce easy around the world," Square founder Jack Dorsey told Inc. magazine.
These five cash disruptors are doing just that.
Square continues its quest for world domination with Square Cash, a peer-to-peer service that lets friends e-mail money.
"We get to design what we want to see in the world rather than doing what other people think should be done," Dorsey told Inc. magazine.
His guiding philosophy has paid off: The technology is so intuitive more than three million merchants use Square's Card Reader to process $12 billion a year in transactions.
That stat alone should sell users on the invite-only service.
Square isn't the only company innovating cash payments with e-mail. Soon Gmail users will be able to do the same thing.
Even if your family and friends don't use Gmail, you can still send them money so long as the search giant has access to your bank account.
The service will be free, however, Google says "low fees" will apply for payments sent through credit or debit cards.
In Venmo's world, owing money is just like sharing a memory. The mobile app lets users tag IOUs with personal notes.
Venmo also makes payments convenient, and with the launch of Venmo Touch this year, it's about to get even easier.
With help from Braintree, an online and mobile payment platform, the new iOS app lets users save credit card information across various apps on their phone.
PayPal has long urged shoppers to "lose their wallets," but now the company is urging small businesses to ditch their cash registers too.
Starting next month, PayPal will launch an initiaitve called Cash for Registers offering free credit, debit card, check, and PayPal processing for the rest of the year to any qualifying U.S.-based business.
All owners need to do is hand over their cash register to receive a card reader, iPad stand, cash drawer, and printer--plus access to of-the-moment PayPal-linked apps like PayPal Here and ShopKeep POS.
Groupon's iPad app Breadcrumb was designed with the food industry in mind. Restaurants, bars, and clubs can use it.
Waitresses can split, process, and transfer various checks, while business owners can tailor the service to fit individual needs. They can make maps of their tables, edit items and tally inventory, and help employees clock in and out.
At $99 per month, the price is right and very disruptive.