REST API architecture is included in WordPress 4.4 version. So you can register custom REST API endpoints. Default REST API URL prefix is wp-json.
For example, http://your-site.com/wp-json/
There is filter to change default REST API URL prefix. This filter is defined within rest_get_url_prefix() function in wp-includes/rest-api.php file.
/** * Filters the REST URL prefix. * * @since 4.4.0 * * @param string $prefix URL prefix. Default 'wp-json'. */ apply_filters( 'rest_url_prefix', 'wp-json' );
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