Extensions Plugin Manager Edit API Authentication Group
From Joomla! Documentation
API Authentication Group
Authentication is required for access to the API with a url of the form http://example.com/api/index.php/v1/article. For more information see the article on Joomla Core APIs.
API Authentication - Basic Authentication
Used to allow basic authentication to Web Services in Joomla. This plugin has no options.
API Authentication - Joomla Token
Used to allow token-based authentication to Web Services in Joomla. This plugin has no options.