The REST XML-RPC Data Checker is a WordPress plugin designed to enhance security by managing access to the JSON REST API and XML-RPC API. By default, these APIs are enabled, potentially exposing sensitive data to unlogged users. This plugin allows website administrators to disable access for unlogged users, remove unnecessary headers, and configure trusted users and IPs, ensuring better control over data exposure.

Key features include the ability to disable the REST API for unlogged users, implement Basic Authentication, and customize endpoint prefixes. Additionally, it provides a user-friendly interface for managing settings, along with programmatic options via hooks. This makes it a valuable tool for enhancing the privacy and security of WordPress sites.