A new venture called SwipeGood rounds up the change on your credit card purchases and automatically contributes it to a designated charity each month.

For all the swiping you do with your credit and debit cards, shouldn’t something good come out of it (other than new shoes)?

Enter SwipeGood, a service so simple it’s hard to believe it didn’t exist before.

Once you enroll one of your cards in the brand new venture, SwipeGood will round up the dollar amounts on all your purchases and at the end of the month donates that spare change to a charity that you’ve designated.

Spend $20.54 at Target one day? At the end of the month, the extra 46 cents could go to charity: water, DonorsChoose.org or some other favorite cause, all without you having to do anything.

Twenty-eight-year-old head of partnerships Steli Efti explained that he and his two 20-something co-founders talked a lot about the process of giving to charity. “It’s a process that seems to have a lot of friction in it,” he says. “There’s so much to decide — how much to give, when and to which organizations.”

“Most people want to give,” he continued, “but there’s so much decision-making that sometimes we don’t end up giving even though we intend to.”

Efti and his partners started playing around with the concept of donating loose change, then began thinking about how they could use advances in technology to scale the age-old approach.

The average SwipeGood user will end up contributing about $20 to charity a month, Efti said. Most of us wouldn’t miss it, would we?

After launching with just American Express cards and a handful of charity partners, SwipeGood is adding major banks and the ability for users to choose their favorite nonprofits.

Take the guilt out of shopping and sign up for SwipeGood right here.