Our API directory now includes 56 billing APIs. The newest is the Merchee API. The most popular, in terms of mashups, is the Stripe API. We list 5 Stripe mashups. Below you'll find some more stats from the directory, including the entire list of billing APIs.
Telefonica, one of the largest telcos in Europe, announced Telenor (Norwegian-based carrier) as its first carrier partner for the BlueVia API platform. The first BlueVia API available to developers is billing services. In-app billing services remove the need for marketplaces like the Apple's app store or iTunes for mobile app purchases. Instead, consumers' purchases are added to their phone bills.