In 2015, $582 billion was sent by migrants to relatives in their home countries. Of that total amount, nearly a quarter (23 percent), or $133.5 billion, originated from the United States. It’s a big deal, but it is mostly an area of financial services that goes wholly unnoticed except by the population that use and rely on it. The remittance business is massive and massively important to the individuals and the countries that receive them, but in the face of other retail payments innovation, they keep a relatively low profile.