Google will give you $5 for inviting a friend to use Wallet

While this seems like something right out of those chain forward emails where Bill Gates was tracking the email and would give you a share of his fortune, it's not — Google wants you to use Google Wallet more to send cash to your friends, and their willing to put their money where their mouth (and your wallet) is. So from now until either 20,000 referrals are sent or November 30th his, Google will give you $5 in credit for each time you send money with Google Wallet along with an invitation to a new user (up to 20 times, and "even a penny works").

source: androidcentral