Our API directory now includes 59 money APIs. The newest is the MoneyScience API. The most popular, in terms of mashups, is the Microsoft adCenter API. We list 3 Microsoft adCenter mashups. Below you'll find some more stats from the directory, including the entire list of money APIs.
The API economy continues to grow but one impediment to this growth is the friction involved when trying to pay for API access. Smoothing this friction may require a change in the handling of API monetization, something the open-source API Network looks to solve through the use of cryptocurrency.