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function is not described

get_oembed_endpoint_url() WP 4.4.0

Retrieves the oEmbed endpoint URL for a given permalink.

Pass an empty string as the first argument to get the endpoint base URL.

Hooks in function
Return

String. The oEmbed endpoint URL.

Usage

get_oembed_endpoint_url( $permalink, $format );
$permalink(string)
The permalink used for the url query arg.
Default: ''
$format(string)
The requested response format.
Default: 'json'

Code of get oembed endpoint url: wp-includes/embed.php WP 5.2.2

<?php
function get_oembed_endpoint_url( $permalink = '', $format = 'json' ) {
	$url = rest_url( 'oembed/1.0/embed' );

	if ( '' !== $permalink ) {
		$url = add_query_arg(
			array(
				'url'    => urlencode( $permalink ),
				'format' => ( 'json' !== $format ) ? $format : false,
			),
			$url
		);
	}

	/**
	 * Filters the oEmbed endpoint URL.
	 *
	 * @since 4.4.0
	 *
	 * @param string $url       The URL to the oEmbed endpoint.
	 * @param string $permalink The permalink used for the `url` query arg.
	 * @param string $format    The requested response format.
	 */
	return apply_filters( 'oembed_endpoint_url', $url, $permalink, $format );
}