From their site: Zaypay makes international micropayments through SMS, phone calls and other alternative pay methods a piece of cake. With its free service a micropayment can be integrated into your website for just minutes of your time. Using our API enables your application to talk with Zaypay directly, and allows Zaypay to talk back to your application.
The growth of APIs owes a lot of thanks to mobile. The reverse is also true, as APIs make possible much of what happens on mobile devices. Along the way, popular API segments have grown with mobile-specific offerings. Perhaps predictably, mobile payments is one of those areas of hyper growth. The most recent crop of mobile payment APIs focuses on specific platforms much of the time, either in addition to or instead of a more universal RESTful API.
Micro-commerce is an emerging global trend, from the microcredit pioneered by Nobel Prize winner Muhammad Yunus, to micropayment systems offered by companies like ZayPay. ZayPay is used for payments for online services, game sites, dating sites, and others. And now they have an API.