diff --git src/bp-blogs/classes/class-bp-blogs-component.php src/bp-blogs/classes/class-bp-blogs-component.php
index a1be1e808..800fea526 100644
--- src/bp-blogs/classes/class-bp-blogs-component.php
+++ src/bp-blogs/classes/class-bp-blogs-component.php
@@ -352,4 +352,27 @@ class BP_Blogs_Component extends BP_Component {
 
 		parent::setup_cache_groups();
 	}
+
+	/**
+	 * Init the BP REST API.
+	 *
+	 * @since 6.0.0
+	 *
+	 * @param array $controllers Optional. See BP_Component::rest_api_init() for
+	 *                           description.
+	 */
+	public function rest_api_init( $controllers = array() ) {
+		if ( is_multisite() ) {
+			$controllers = array(
+				'BP_REST_Blogs_Endpoint',
+			);
+
+			// Support to Blog Avatar.
+			if ( bp_is_active( 'blogs', 'site-icon' ) ) {
+				$controllers[] = 'BP_REST_Attachments_Blog_Avatar_Endpoint';
+			}
+		}
+
+		parent::rest_api_init( $controllers );
+	}
 }
diff --git src/bp-core/classes/class-bp-rest-attachments-group-avatar-endpoint.php src/bp-core/classes/class-bp-rest-attachments-group-avatar-endpoint.php
new file mode 100644
index 000000000..51c7d1c04
--- /dev/null
+++ src/bp-core/classes/class-bp-rest-attachments-group-avatar-endpoint.php
@@ -0,0 +1,14 @@
+<?php
+/**
+ * BP REST: BP_REST_Attachments_Group_Avatar_Endpoint class
+ *
+ * @package BuddyPress
+ * @deprecated 6.0.0
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+_deprecated_file( basename( __FILE__ ), '6.0.0', 'bp-groups/classes/class-bp-rest-attachments-group-avatar-endpoint.php' );
+
+/** BP_REST_Attachments_Group_Avatar_Endpoint class */
+require_once trailingslashit( constant( 'BP_PLUGIN_DIR' ) . constant( 'BP_SOURCE_SUBDIRECTORY' ) ) . 'bp-groups/classes/class-bp-rest-attachments-group-avatar-endpoint.php';
diff --git src/bp-core/classes/class-bp-rest-attachments-member-avatar-endpoint.php src/bp-core/classes/class-bp-rest-attachments-member-avatar-endpoint.php
new file mode 100644
index 000000000..d217dcdcf
--- /dev/null
+++ src/bp-core/classes/class-bp-rest-attachments-member-avatar-endpoint.php
@@ -0,0 +1,14 @@
+<?php
+/**
+ * BP REST: BP_REST_Attachments_Member_Avatar_Endpoint class
+ *
+ * @package BuddyPress
+ * @deprecated 6.0.0
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+_deprecated_file( basename( __FILE__ ), '6.0.0', 'bp-members/classes/class-class-bp-rest-attachments-member-avatar-endpoint.php' );
+
+/** BP_REST_Attachments_Member_Avatar_Endpoint class */
+require_once trailingslashit( constant( 'BP_PLUGIN_DIR' ) . constant( 'BP_SOURCE_SUBDIRECTORY' ) ) . 'bp-members/classes/class-bp-rest-attachments-member-avatar-endpoint.php';
diff --git src/bp-friends/classes/class-bp-friends-component.php src/bp-friends/classes/class-bp-friends-component.php
index 90a244b75..e2a044ec2 100644
--- src/bp-friends/classes/class-bp-friends-component.php
+++ src/bp-friends/classes/class-bp-friends-component.php
@@ -321,4 +321,16 @@ class BP_Friends_Component extends BP_Component {
 
 		parent::setup_cache_groups();
 	}
+
+	/**
+	 * Init the BP REST API.
+	 *
+	 * @since 6.0.0
+	 *
+	 * @param array $controllers Optional. See BP_Component::rest_api_init() for
+	 *                           description.
+	 */
+	public function rest_api_init( $controllers = array() ) {
+		parent::rest_api_init( array( 'BP_REST_Friends_Endpoint' ) );
+	}
 }
diff --git src/bp-groups/classes/class-bp-groups-component.php src/bp-groups/classes/class-bp-groups-component.php
index 2f07fceae..547ba32fc 100644
--- src/bp-groups/classes/class-bp-groups-component.php
+++ src/bp-groups/classes/class-bp-groups-component.php
@@ -928,18 +928,26 @@ class BP_Groups_Component extends BP_Component {
 	 * Init the BP REST API.
 	 *
 	 * @since 5.0.0
+	 * @since 6.0.0 Adds the Group Cover REST endpoint.
 	 *
 	 * @param array $controllers Optional. See BP_Component::rest_api_init() for
 	 *                           description.
 	 */
 	public function rest_api_init( $controllers = array() ) {
-		parent::rest_api_init( array(
+		$controllers = array(
 			'BP_REST_Groups_Endpoint',
 			'BP_REST_Group_Membership_Endpoint',
 			'BP_REST_Group_Invites_Endpoint',
 			'BP_REST_Group_Membership_Request_Endpoint',
 			'BP_REST_Attachments_Group_Avatar_Endpoint',
-		) );
+		);
+
+		// Support to Group Cover.
+		if ( bp_is_active( 'groups', 'cover_image' ) ) {
+			$controllers[] = 'BP_REST_Attachments_Group_Cover_Endpoint';
+		}
+
+		parent::rest_api_init( $controllers );
 	}
 
 	/**
diff --git src/bp-members/classes/class-bp-members-component.php src/bp-members/classes/class-bp-members-component.php
index 25818244e..daebb2ab2 100644
--- src/bp-members/classes/class-bp-members-component.php
+++ src/bp-members/classes/class-bp-members-component.php
@@ -654,12 +654,13 @@ class BP_Members_Component extends BP_Component {
 	 * Init the BP REST API.
 	 *
 	 * @since 5.0.0
+	 * @since 6.0.0 Adds the Member Cover and Signup REST endpoints.
 	 *
 	 * @param array $controllers Optional. See BP_Component::rest_api_init() for
 	 *                           description.
 	 */
 	public function rest_api_init( $controllers = array() ) {
-		parent::rest_api_init( array(
+		$controllers = array(
 			/**
 			 * As the Members component is always loaded,
 			 * let's register the Components endpoint here.
@@ -667,7 +668,17 @@ class BP_Members_Component extends BP_Component {
 			'BP_REST_Components_Endpoint',
 			'BP_REST_Members_Endpoint',
 			'BP_REST_Attachments_Member_Avatar_Endpoint',
-		) );
+		);
+
+		if ( bp_is_active( 'members', 'cover_image' ) ) {
+			$controllers[] = 'BP_REST_Attachments_Member_Cover_Endpoint';
+		}
+
+		if ( bp_get_signup_allowed() ) {
+			$controllers[] = 'BP_REST_Signup_Endpoint';
+		}
+
+		parent::rest_api_init( $controllers );
 	}
 
 	/**
diff --git src/class-buddypress.php src/class-buddypress.php
index e4e559eae..61c153af9 100644
--- src/class-buddypress.php
+++ src/class-buddypress.php
@@ -550,40 +550,42 @@ class BuddyPress {
 			'BP_Akismet'                => 'activity',
 			'BP_REST_Activity_Endpoint' => 'activity',
 
-			'BP_Admin'                                   => 'core',
-			'BP_Attachment_Avatar'                       => 'core',
-			'BP_Attachment_Cover_Image'                  => 'core',
-			'BP_Attachment'                              => 'core',
-			'BP_Button'                                  => 'core',
-			'BP_Block'                                   => 'core',
-			'BP_Component'                               => 'core',
-			'BP_Customizer_Control_Range'                => 'core',
-			'BP_Date_Query'                              => 'core',
-			'BP_Email_Delivery'                          => 'core',
-			'BP_Email_Address'                           => 'core',
-			'BP_Email_Recipient'                         => 'core',
-			'BP_Email_Sender'                            => 'core',
-			'BP_Email_Participant'                       => 'core',
-			'BP_Email'                                   => 'core',
-			'BP_Embed'                                   => 'core',
-			'BP_Media_Extractor'                         => 'core',
-			'BP_Members_Suggestions'                     => 'core',
-			'BP_PHPMailer'                               => 'core',
-			'BP_Recursive_Query'                         => 'core',
-			'BP_Suggestions'                             => 'core',
-			'BP_Theme_Compat'                            => 'core',
-			'BP_User_Query'                              => 'core',
-			'BP_Walker_Category_Checklist'               => 'core',
-			'BP_Walker_Nav_Menu_Checklist'               => 'core',
-			'BP_Walker_Nav_Menu'                         => 'core',
-			'BP_Invitation_Manager'                      => 'core',
-			'BP_Invitation'                              => 'core',
-			'BP_REST_Components_Endpoint'                => 'core',
-			'BP_REST_Attachments'                        => 'core',
-			'BP_REST_Attachments_Member_Avatar_Endpoint' => 'core',
-			'BP_REST_Attachments_Group_Avatar_Endpoint'  => 'core',
-
-			'BP_Core_Friends_Widget' => 'friends',
+			'BP_REST_Blogs_Endpoint'                   => 'blogs',
+			'BP_REST_Attachments_Blog_Avatar_Endpoint' => 'blogs',
+
+			'BP_Admin'                     => 'core',
+			'BP_Attachment_Avatar'         => 'core',
+			'BP_Attachment_Cover_Image'    => 'core',
+			'BP_Attachment'                => 'core',
+			'BP_Button'                    => 'core',
+			'BP_Block'                     => 'core',
+			'BP_Component'                 => 'core',
+			'BP_Customizer_Control_Range'  => 'core',
+			'BP_Date_Query'                => 'core',
+			'BP_Email_Delivery'            => 'core',
+			'BP_Email_Address'             => 'core',
+			'BP_Email_Recipient'           => 'core',
+			'BP_Email_Sender'              => 'core',
+			'BP_Email_Participant'         => 'core',
+			'BP_Email'                     => 'core',
+			'BP_Embed'                     => 'core',
+			'BP_Media_Extractor'           => 'core',
+			'BP_Members_Suggestions'       => 'core',
+			'BP_PHPMailer'                 => 'core',
+			'BP_Recursive_Query'           => 'core',
+			'BP_Suggestions'               => 'core',
+			'BP_Theme_Compat'              => 'core',
+			'BP_User_Query'                => 'core',
+			'BP_Walker_Category_Checklist' => 'core',
+			'BP_Walker_Nav_Menu_Checklist' => 'core',
+			'BP_Walker_Nav_Menu'           => 'core',
+			'BP_Invitation_Manager'        => 'core',
+			'BP_Invitation'                => 'core',
+			'BP_REST_Components_Endpoint'  => 'core',
+			'BP_REST_Attachments'          => 'core',
+
+			'BP_Core_Friends_Widget'   => 'friends',
+			'BP_REST_Friends_Endpoint' => 'friends',
 
 			'BP_Group_Extension'                        => 'groups',
 			'BP_Group_Member_Query'                     => 'groups',
@@ -591,14 +593,19 @@ class BuddyPress {
 			'BP_REST_Group_Membership_Endpoint'         => 'groups',
 			'BP_REST_Group_Invites_Endpoint'            => 'groups',
 			'BP_REST_Group_Membership_Request_Endpoint' => 'groups',
-
-			'BP_Core_Members_Template'       => 'members',
-			'BP_Core_Members_Widget'         => 'members',
-			'BP_Core_Recently_Active_Widget' => 'members',
-			'BP_Core_Whos_Online_Widget'     => 'members',
-			'BP_Registration_Theme_Compat'   => 'members',
-			'BP_Signup'                      => 'members',
-			'BP_REST_Members_Endpoint'       => 'members',
+			'BP_REST_Attachments_Group_Avatar_Endpoint' => 'groups',
+			'BP_REST_Attachments_Group_Cover_Endpoint'  => 'groups',
+
+			'BP_Core_Members_Template'                   => 'members',
+			'BP_Core_Members_Widget'                     => 'members',
+			'BP_Core_Recently_Active_Widget'             => 'members',
+			'BP_Core_Whos_Online_Widget'                 => 'members',
+			'BP_Registration_Theme_Compat'               => 'members',
+			'BP_Signup'                                  => 'members',
+			'BP_REST_Members_Endpoint'                   => 'members',
+			'BP_REST_Attachments_Member_Avatar_Endpoint' => 'members',
+			'BP_REST_Attachments_Member_Cover_Endpoint'  => 'members',
+			'BP_REST_Signup_Endpoint'                    => 'members',
 
 			'BP_REST_Messages_Endpoint' => 'messages',