Earlier we wrote about COIN which can hold all your card details and you can use it for purchase too. We contacted them to know the availability of the product and the application (*which you can use in mobile) platform. Below you can see the reply from them
Thanks for your message and for your interest in Coin. Apologies for our late response.
Coin mobile apps will initially be available for iOS and Android. We're keeping track of demand for Windows phone and will consider building an app for the platform in the future.
Yes, we do ship internationally, it costs the same as domestic shipping, $5
So do you wish to preorder one ? here is the link