The Gain Capital .NET SDK can be downloaded to interact with the API. Developers can implement financial and currency features into applications by using the interface and the resources at the documentation site.
Global payments company Mastercard has announced that it will be opening up its internal blockchain API to developers. According to the company, the API, which is focused on B2B transactions, "Mastercard’s blockchain solution provides a new way for consumers, businesses and banks to transact."
In a relatively short time, the Stripe API has become a popular choice amongst developers wanting to incorporate payments into their apps. While its simple documentation and quick setup have received most of the attention, it's also a robust platform. Among the features that have endeared it to developers are events, which use webhooks to update apps on incidents of note.