Yes, there are several third-party APIs available for accessing WordPress theme details. Here are a few examples:
1. WordPress Theme API: The WordPress Theme API provides access to theme information through the `wp-json/wp/v2/themes` endpoint. This API allows you to retrieve information about themes, such as their name, version, author, and description[1].
2. WordPress REST API: The WordPress REST API is a more comprehensive interface that allows external applications to access WordPress data. It includes endpoints for retrieving theme information, such as `wp-json/wp/v2/themes` and `wp-json/wp/v2/themes/
3. WPGet API: WPGet API is a WordPress plugin that allows you to connect to external REST APIs without coding. It supports virtually all authentication methods and can be used to retrieve data from unlimited 3rd-party REST APIs[4].
4. WordPress Theme Detector API: Some online tools, like WordPress Theme Detector, provide APIs for accessing theme information. These APIs can be used to integrate theme detection functionality into other applications[3].
These APIs can be used to create custom applications that interact with WordPress themes, such as theme detectors, theme managers, or theme-based plugins.
Citations:[1] https://stackoverflow.com/questions/30024266/get-theme-and-wordpress-version-details-via-api
[2] https://positiwise.com/blog/how-to-integrate-a-third-party-api-into-a-wordpress-website
[3] https://www.duplichecker.com/wordpress-theme-detector.php
[4] https://wordpress.org/plugins/wpgetapi/
[5] https://www.wpthemedetector.com