Analytics APIs are tools that facilitate the systematic analysis of data, offering insights to aid decision-making by identifying trends, patterns, and customer behaviors. These APIs can be integrated into applications to streamline analytic processes. Some notable analytics APIs include MailChimp for managing email lists and campaigns, Google Analytics for creating and managing analytics entities, and Microsoft Text Analytics for analyzing text using machine learning algorithms. Each API offers various pricing tiers, ranging from free to premium, depending on the features and usage levels desired. These APIs are designed to enhance application functionality by providing predefined methods for data analysis, ultimately aiding businesses in their analytic endeavors.