The Parallel Decisions API is a web-based classification tool designed for developers who create software, enhance data processes, and build workflows for AI agents. When a request is made, it includes specific context along with one or more defined questions, and in return, the API provides structured answers complete with probabilities and references to relevant online sources. This functionality allows multiple questions to be grouped under a single context within one request, enabling various applications such as vendor or company evaluations, lead management, compliance checks, content moderation, and establishing guidelines for agents. By accessing real-time web data, it can evaluate facts that might have evolved since the last training of a model. Developers can interact with the API via a RESTful endpoint using an API key or utilize the web_decisions tool through Parallel's MCP server. To facilitate testing and integration, a hosted playground and comprehensive documentation are available for user convenience. Furthermore, this API empowers developers to make informed decisions by providing up-to-date information that enhances the reliability of their applications.