This API is down. I got the following while testing the end point in the documentation page:

This API encountered an error. You can open a ticket to contact the API provider.
HTTP/1.1 503 Service Unavailable
Cache-Control: no-cache, no-store
Cf-Ray: 1df5f73c8f4a02b7-IAD
Connection: keep-alive
Content-Type: text/html; charset=utf-8
Date: Thu, 30 Apr 2015 20:23:40 GMT
Server: Mashape/5.0.6
Transfer-Encoding: chunked
X-Ratelimit-Requests-Limit: 2500
X-Ratelimit-Requests-Remaining: 2375

Thanks.