Check out the MeaningCloud Sentiment Analysis API.
Dandelion API is a set of semantic APIs to extract meaning and insights from texts in several languages (Italian, English, French, German and Portuguese). It's optimized to perform text mining and text analytics for short texts, such as tweets and other social media. Dandelion API extracts entities (such as persons, places and events), categorizes and classifies documents in user-defined categories, augments the text with tags and links to external knowledge graphs and more. Dandelion API easily scales to support billions of queries per day and can be adapted on demand to support custom and user-defined vocabularies. Additional languages are available on demand.
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Use b-semantic's API to extract and analyze web text. The API contains endpoints for text extraction, entity extraction, similarity computing and URL recommendations based on similarity. b-semantic is REST based, employs HTTP POST methods, and accepts JSON data types. Use the text extraction service to extract the main text elements from a URL or HTML source code. The entity extraction web service identifies entities. Compare URL's, HTML Fragments or text by measuring their similarity. Finally get recommendations based on website similarity. IMPORTANT: This is one of the rare apis that explicitly supports the german language regarding semantic analytics!
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