diff --git a/wp-includes/rest-api/class-wp-rest-server.php b/wp-includes/rest-api/class-wp-rest-server.php
index 3585aa7656..b7451ffc18 100644
--- a/wp-includes/rest-api/class-wp-rest-server.php
+++ b/wp-includes/rest-api/class-wp-rest-server.php
@@ -1403,6 +1403,8 @@ class WP_REST_Server {
 			'endpoints' => array(),
 		);
 
+		$allow_batch = false;
+
 		if ( isset( $this->route_options[ $route ] ) ) {
 			$options = $this->route_options[ $route ];
 
@@ -1410,6 +1412,8 @@ class WP_REST_Server {
 				$data['namespace'] = $options['namespace'];
 			}
 
+			$allow_batch = isset( $options['allow_batch'] ) ? $options['allow_batch'] : false;
+
 			if ( isset( $options['schema'] ) && 'help' === $context ) {
 				$data['schema'] = call_user_func( $options['schema'] );
 			}
@@ -1430,6 +1434,12 @@ class WP_REST_Server {
 				'methods' => array_keys( $callback['methods'] ),
 			);
 
+			$callback_batch = isset( $callback['allow_batch'] ) ? $callback['allow_batch'] : $allow_batch;
+
+			if ( $callback_batch ) {
+				$endpoint_data['allow_batch'] = $callback_batch;
+			}
+
 			if ( isset( $callback['args'] ) ) {
 				$endpoint_data['args'] = array();
 
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index ad6a89b234..423347a721 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -16,6 +16,14 @@
  */
 class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 
+	/**
+	 * Whether the controller supports batching.
+	 *
+	 * @since 5.9.0
+	 * @var false
+	 */
+	protected $allow_batch = false;
+
 	/**
 	 * Registers the routes for attachments.
 	 *
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index ffb4466892..fd7fa22b4c 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -39,6 +39,14 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 	 */
 	protected $password_check_passed = array();
 
+	/**
+	 * Whether the controller supports batching.
+	 *
+	 * @since 5.9.0
+	 * @var array
+	 */
+	protected $allow_batch = array( 'v1' => true );
+
 	/**
 	 * Constructor.
 	 *
@@ -80,7 +88,8 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 					'permission_callback' => array( $this, 'create_item_permissions_check' ),
 					'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::CREATABLE ),
 				),
-				'schema' => array( $this, 'get_public_item_schema' ),
+				'allow_batch' => $this->allow_batch,
+				'schema'      => array( $this, 'get_public_item_schema' ),
 			)
 		);
 
@@ -98,7 +107,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			$this->namespace,
 			'/' . $this->rest_base . '/(?P<id>[\d]+)',
 			array(
-				'args'   => array(
+				'args'        => array(
 					'id' => array(
 						'description' => __( 'Unique identifier for the post.' ),
 						'type'        => 'integer',
@@ -128,7 +137,8 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 						),
 					),
 				),
-				'schema' => array( $this, 'get_public_item_schema' ),
+				'allow_batch' => $this->allow_batch,
+				'schema'      => array( $this, 'get_public_item_schema' ),
 			)
 		);
 	}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
index 3a92b774f0..8856609375 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
@@ -48,6 +48,14 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 	 */
 	protected $total_terms;
 
+	/**
+	 * Whether the controller supports batching.
+	 *
+	 * @since 5.9.0
+	 * @var array
+	 */
+	protected $allow_batch = array( 'v1' => true );
+
 	/**
 	 * Constructor.
 	 *
@@ -89,7 +97,8 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 					'permission_callback' => array( $this, 'create_item_permissions_check' ),
 					'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::CREATABLE ),
 				),
-				'schema' => array( $this, 'get_public_item_schema' ),
+				'allow_batch' => $this->allow_batch,
+				'schema'      => array( $this, 'get_public_item_schema' ),
 			)
 		);
 
@@ -97,7 +106,7 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 			$this->namespace,
 			'/' . $this->rest_base . '/(?P<id>[\d]+)',
 			array(
-				'args'   => array(
+				'args'        => array(
 					'id' => array(
 						'description' => __( 'Unique identifier for the term.' ),
 						'type'        => 'integer',
@@ -129,7 +138,8 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 						),
 					),
 				),
-				'schema' => array( $this, 'get_public_item_schema' ),
+				'allow_batch' => $this->allow_batch,
+				'schema'      => array( $this, 'get_public_item_schema' ),
 			)
 		);
 	}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
index 6385be8ef8..8cf7039d1f 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
@@ -24,6 +24,14 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 	 */
 	protected $widgets_retrieved = false;
 
+	/**
+	 * Whether the controller supports batching.
+	 *
+	 * @since 5.9.0
+	 * @var array
+	 */
+	protected $allow_batch = array( 'v1' => true );
+
 	/**
 	 * Widgets controller constructor.
 	 *
@@ -56,7 +64,7 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 					'permission_callback' => array( $this, 'create_item_permissions_check' ),
 					'args'                => $this->get_endpoint_args_for_item_schema(),
 				),
-				'allow_batch' => array( 'v1' => true ),
+				'allow_batch' => $this->allow_batch,
 				'schema'      => array( $this, 'get_public_item_schema' ),
 			)
 		);
@@ -90,7 +98,7 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 						),
 					),
 				),
-				'allow_batch' => array( 'v1' => true ),
+				'allow_batch' => $this->allow_batch,
 				'schema'      => array( $this, 'get_public_item_schema' ),
 			)
 		);
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 16e6e5fbef..2cf20e019e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52067';
+$wp_version = '5.9-alpha-52068';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.