I want PhantomJs.Cloud to meet your needs! Please email me (jasons aat novaleaf doot coom) or leave an issue on mashape saying what you'd like, and i'll get to it as fast as possible!
the phantomjs.cloud api is free right now, in public beta. usage limits are 200/day with the demo-api-key. To increase your quota to 10000 pages/day, visit our website and sign up for your own private api key. it's free!
sign up here: http://phantomjscloud.com/site/signup.html
the mashape demo/docs is awesome, but if you want to see other api's not yet added to mashape (such as batch processing) you can look here: http://phantomjscloud.com/site/docs.html#demo