The coin that replaces credit cards - but is it secure?
20 December 2013 Last updated at 11:37 GMT
A single credit card sized device, called Coin, allows you to store the details of up to eight cards on it.
But how secure is it, since you have to effectively clone your own credit cards to add their details to the device?
BBC Click's Spencer Kelly spoke to Kanishk Parashar, the founder and chief executive of Coin.