Mashery API Explorer is a new, free way for developers to discover and test APIs from dozens of companies including USA TODAY, Yellow Pages Group, Hotwire, and Klout. Mashery API Explorer is the first API discovery tool that automatically and securely populates API keys for developers across multiple API platforms. Mashery API Explorer presents APIs in the popular Mashery I/O Docs format, which combines technical documentation and testing in one convenient place.

Mashery API Explorer screenshot