The coin that replaces credit cards - but it is 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.
Watch more clips on the Click website. If you are in the UK you can watch the whole programme on BBC iPlayer.
