The Cloud Pricing API is a GraphQL-based tool designed to aggregate and update over 3 million public prices from AWS, Azure, and Google Cloud, making it easier to analyze and filter cloud pricing data for specific needs, such as the Infracost CLI. It leverages GraphQL's ability to model nested JSON structures, allowing users to query vendor-specific parameters and select only the necessary attributes. With a hosted version available through Infracost, users can register for an API key to access and query the latest cloud prices, such as AWS EC2 instances, using a flexible schema that features two main types: Products and Prices. This schema mirrors the cloud vendor APIs, offering a high level of flexibility with top-level product filters and attributes like vendorName, service, and region, along with price details including currency, unit, and purchase options.