Our API directory now includes 73 management APIs. The newest is the Jupix API. The most popular, in terms of mashups, is the BuzzData API. We list 6 BuzzData mashups. Below you'll find some more stats from the directory, including the entire list of management APIs.
Developers are often asked to add eSignature capabilities to apps they are building. DocuSigning contracts in digital document form is the common way to do this, but contracts can be executed by email, SMS, click-through, and more. This article shows you how this can be done with the PactSafe API.