3scale is an API management platform that provides performance, customer control and excellent time-to-value. They deliver self-service, highly scalable solutions to open, package, distribute, control, and monetize your APIs so you can share company data, content, or services through Web or mobile applications. It lets you avoid the hassle and constant maintenance of building a solution from scratch.
Both 3scale and Apiary are great tools for managing APIs. 3scale has some great features to offer such as log tracking, single sign-on, custom branding, analytics etc. 3scale has two plans - a Pro plan that is priced at $750 perAPI Management Services