TransferWise, a peer-to-peer money transfer service developed in Estonia and based in the UK. This is a simple-to-use way to transfer money to someone in a country with a different currency. The peer-to-peer element is somewhat illusory, because all that TransferWise does is aggregate flows of currencies—for example, the pound to the euro and the euro to the pound—in a highly efficient way for people transferring small sums of money. The key to its success is the simplified interface, not the peer-to-peer element, with one exception, which is that the latter drives viral growth.
