diff --git a/wp-includes/post.php b/wp-includes/post.php
index d8ccf05ffb..5cda6bd5b6 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -255,18 +255,21 @@ function create_initial_post_types() {
 	register_post_type(
 		'wp_block',
 		array(
-			'labels'          => array(
+			'labels'                => array(
 				'name'          => __( 'Blocks' ),
 				'singular_name' => __( 'Block' ),
 				'search_items'  => __( 'Search Blocks' ),
 			),
-			'public'          => false,
-			'_builtin'        => true, /* internal use only. don't use this when registering your own post type. */
-			'show_ui'         => true,
-			'show_in_menu'    => false,
-			'rewrite'         => false,
-			'capability_type' => 'block',
-			'capabilities'    => array(
+			'public'                => false,
+			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
+			'show_ui'               => true,
+			'show_in_menu'          => false,
+			'rewrite'               => false,
+			'show_in_rest'          => true,
+			'rest_base'             => 'blocks',
+			'rest_controller_class' => 'WP_REST_Blocks_Controller',
+			'capability_type'       => 'block',
+			'capabilities'          => array(
 				// You need to be able to edit posts, in order to read blocks in their raw form.
 				'read'                   => 'edit_posts',
 				// You need to be able to publish posts, in order to create blocks.
@@ -276,8 +279,8 @@ function create_initial_post_types() {
 				'edit_others_posts'      => 'edit_others_posts',
 				'delete_others_posts'    => 'delete_others_posts',
 			),
-			'map_meta_cap'    => true,
-			'supports'        => array(
+			'map_meta_cap'          => true,
+			'supports'              => array(
 				'title',
 				'editor',
 			),
diff --git a/wp-includes/rest-api.php b/wp-includes/rest-api.php
index 5ab3857cd2..f8e97065a9 100644
--- a/wp-includes/rest-api.php
+++ b/wp-includes/rest-api.php
@@ -249,6 +249,10 @@ function create_initial_rest_routes() {
 	$controller = new WP_REST_Search_Controller( $search_handlers );
 	$controller->register_routes();
 
+	// Block Renderer.
+	$controller = new WP_REST_Block_Renderer_Controller;
+	$controller->register_routes();
+
 	// Settings.
 	$controller = new WP_REST_Settings_Controller;
 	$controller->register_routes();
@@ -256,6 +260,7 @@ function create_initial_rest_routes() {
 	// Themes.
 	$controller = new WP_REST_Themes_Controller;
 	$controller->register_routes();
+
 }
 
 /**
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php
new file mode 100644
index 0000000000..f0e1e7db47
--- /dev/null
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php
@@ -0,0 +1,177 @@
+<?php
+/**
+ * Block Renderer REST API: WP_REST_Block_Renderer_Controller class
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ * @since 5.0.0
+ */
+
+/**
+ * Controller which provides REST endpoint for rendering a block.
+ *
+ * @since 5.0.0
+ *
+ * @see WP_REST_Controller
+ */
+class WP_REST_Block_Renderer_Controller extends WP_REST_Controller {
+
+	/**
+	 * Constructs the controller.
+	 *
+	 * @since 5.0.0
+	 */
+	public function __construct() {
+		$this->namespace = 'wp/v2';
+		$this->rest_base = 'block-renderer';
+	}
+
+	/**
+	 * Registers the necessary REST API routes, one for each dynamic block.
+	 *
+	 * @since 5.0.0
+	 */
+	public function register_routes() {
+		$block_types = WP_Block_Type_Registry::get_instance()->get_all_registered();
+
+		foreach ( $block_types as $block_type ) {
+			if ( ! $block_type->is_dynamic() ) {
+				continue;
+			}
+
+			register_rest_route(
+				$this->namespace,
+				'/' . $this->rest_base . '/(?P<name>' . $block_type->name . ')',
+				array(
+					'args'   => array(
+						'name' => array(
+							'description' => __( 'Unique registered name for the block.' ),
+							'type'        => 'string',
+						),
+					),
+					array(
+						'methods'             => WP_REST_Server::READABLE,
+						'callback'            => array( $this, 'get_item' ),
+						'permission_callback' => array( $this, 'get_item_permissions_check' ),
+						'args'                => array(
+							'context'    => $this->get_context_param( array( 'default' => 'view' ) ),
+							'attributes' => array(
+								/* translators: %s is the name of the block */
+								'description'          => sprintf( __( 'Attributes for %s block' ), $block_type->name ),
+								'type'                 => 'object',
+								'additionalProperties' => false,
+								'properties'           => $block_type->get_attributes(),
+							),
+							'post_id'    => array(
+								'description' => __( 'ID of the post context.' ),
+								'type'        => 'integer',
+							),
+						),
+					),
+					'schema' => array( $this, 'get_public_item_schema' ),
+				)
+			);
+		}
+	}
+
+	/**
+	 * Checks if a given request has access to read blocks.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param WP_REST_Request $request Request.
+	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
+	 */
+	public function get_item_permissions_check( $request ) {
+		global $post;
+
+		$post_id = isset( $request['post_id'] ) ? intval( $request['post_id'] ) : 0;
+
+		if ( 0 < $post_id ) {
+			$post = get_post( $post_id );
+
+			if ( ! $post || ! current_user_can( 'edit_post', $post->ID ) ) {
+				return new WP_Error(
+					'block_cannot_read',
+					__( 'Sorry, you are not allowed to read blocks of this post.' ),
+					array(
+						'status' => rest_authorization_required_code(),
+					)
+				);
+			}
+		} else {
+			if ( ! current_user_can( 'edit_posts' ) ) {
+				return new WP_Error(
+					'block_cannot_read',
+					__( 'Sorry, you are not allowed to read blocks as this user.' ),
+					array(
+						'status' => rest_authorization_required_code(),
+					)
+				);
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * Returns block output from block's registered render_callback.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function get_item( $request ) {
+		global $post;
+
+		$post_id = isset( $request['post_id'] ) ? intval( $request['post_id'] ) : 0;
+
+		if ( 0 < $post_id ) {
+			$post = get_post( $post_id );
+
+			// Set up postdata since this will be needed if post_id was set.
+			setup_postdata( $post );
+		}
+		$registry = WP_Block_Type_Registry::get_instance();
+		$block    = $registry->get_registered( $request['name'] );
+
+		if ( null === $block ) {
+			return new WP_Error(
+				'block_invalid',
+				__( 'Invalid block.' ),
+				array(
+					'status' => 404,
+				)
+			);
+		}
+
+		$data = array(
+			'rendered' => $block->render( $request->get_param( 'attributes' ) ),
+		);
+		return rest_ensure_response( $data );
+	}
+
+	/**
+	 * Retrieves block's output schema, conforming to JSON Schema.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @return array Item schema data.
+	 */
+	public function get_item_schema() {
+		return array(
+			'$schema'    => 'http://json-schema.org/schema#',
+			'title'      => 'rendered-block',
+			'type'       => 'object',
+			'properties' => array(
+				'rendered' => array(
+					'description' => __( 'The rendered block.' ),
+					'type'        => 'string',
+					'required'    => true,
+					'context'     => array( 'edit' ),
+				),
+			),
+		);
+	}
+}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
new file mode 100644
index 0000000000..66a2e7adad
--- /dev/null
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
@@ -0,0 +1,39 @@
+<?php
+/**
+ * Reusable blocks REST API: WP_REST_Blocks_Controller class
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ * @since 5.0.0
+ */
+
+/**
+ * Controller which provides a REST endpoint for the editor to read, create,
+ * edit and delete reusable blocks. Blocks are stored as posts with the wp_block
+ * post type.
+ *
+ * @since 5.0.0
+ *
+ * @see WP_REST_Posts_Controller
+ * @see WP_REST_Controller
+ */
+class WP_REST_Blocks_Controller extends WP_REST_Posts_Controller {
+
+	/**
+	 * Checks if a block can be read.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param object $post Post object that backs the block.
+	 * @return bool Whether the block can be read.
+	 */
+	public function check_read_permission( $post ) {
+		// Ensure that the user is logged in and has the read_blocks capability.
+		$post_type = get_post_type_object( $post->post_type );
+		if ( ! current_user_can( $post_type->cap->read_post, $post->ID ) ) {
+			return false;
+		}
+
+		return parent::check_read_permission( $post );
+	}
+}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5684332b34..1f2b32241d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44149';
+$wp_version = '5.1-alpha-44150';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-settings.php b/wp-settings.php
index 9b1d9f5445..4f15f0edc2 100644
--- a/wp-settings.php
+++ b/wp-settings.php
@@ -236,6 +236,8 @@ require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-terms-controller.p
 require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-users-controller.php' );
 require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-comments-controller.php' );
 require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-search-controller.php' );
+require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-blocks-controller.php' );
+require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-block-renderer-controller.php' );
 require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-settings-controller.php' );
 require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-themes-controller.php' );
 require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-meta-fields.php' );