[Editor's Note: This API profile has been marked defunct, because it is a dupe of the Microsoft Azure Cognitive Services Text Analytics API profile.]
The Microsoft Cognitive Services Text Analysis REST API provides structure, analysis, and sentiment analysis for unstructured text. This API is built on Azure Machine Learning capabilities. Currently, there is a free plan available, and a standard option with a price based on Azure usage. The Text Analysis API uses JSON for data exchange, and API Keys for authentication.