Coin: Only one card on you wallet

https://onlycoin.com/

This looks so interesting but it won’t work in many places because it doesn’t support the EMV standard .

Q. Will my Coin work outside the U.S.? A. Not in all cases.

U.S.-based customers: Coin will work overseas, but we recommend that you bring a backup card when you travel.

Customers located outside of the U.S.: Coin does not support EMV yet. If the country you live it requires it we recommend holding off your purchase for now.