Они хорошо известны, но просто не в наших краях..))
Тоже в первые про них слышу.
Вот сайт
https://www.snapcard.io/about, таки известная контора
Founded in 2013, We started with building the simplest suite of products and services which were designed to make it easy for consumers and businesses to use blockchain technologies.
Our latest product, MassPay, is an enterprise-level API which allows companies to instantly send funds worldwide, without taking on any price volatility, and for a fraction of the cost. We've partnered with Fortune 500 companies and are currently moving millions of dollars on a daily basis. And we're really just getting started.