Freebie: $10 from Serve

Serve, American Express's digital payments platform is currently giving away $10 just for signing up for a free account. You can use Serve to settle the dinner bill with friends, transfer money to your family for the big holiday gift for mom, or save it for your next shopping spree! Serve users can take their money with them anywhere, using the Serve mobile app on their smartphone, and can manage their account and send or receive money on the go.