The multilingual sentiment analysis API from Chatterbox classifies short texts as positive or negative. The system uses advanced statistical models trained on social data, meaning the detection can handle slang, common misspellings, emoticons, hashtags, etc. This is the paid-for flavour of the API. We have a free flavour available here: http://www.mashape.com/apis/Sentiment+Analysis+Free. This version of the API offers greater flexibility. Full details on the awesomeness of the API can be found at www.cbanalytics.co.uk/api