The X-Cash API https://api.xcash.foundation allows users to read information from various X-Cash products using one standardized API. The current individual API can still be used, but it is recommended to migrate and use the standard API for various reasons.
The individual API were built mostly for the websites, not as a standardized API for users.
The standard API will use "standardized" API methods, resources, parameters, return field types etc
The standard API will have more features than the individual API
The standard API will use one domain instead of multiple
The standard API is built with users in mind, using a specific backend processing and server setup for public APIs
Note: For the blockchain API it is not meant to be a complete set. You can get much more data using any remote daemon to get more info. This is meant to include the most common use cases and data.