diff --git a/projects/plugins/jetpack/changelog/add-wpcom-site-setup-to-sites-endpoint b/projects/plugins/jetpack/changelog/add-wpcom-site-setup-to-sites-endpoint
new file mode 100644
index 0000000000000..e703b9f31c796
--- /dev/null
+++ b/projects/plugins/jetpack/changelog/add-wpcom-site-setup-to-sites-endpoint
@@ -0,0 +1,4 @@
+Significance: minor
+Type: other
+
+Add wpcom_site_setup property to /sites/{siteId} endpoint
diff --git a/projects/plugins/jetpack/json-endpoints/class.wpcom-json-api-get-site-endpoint.php b/projects/plugins/jetpack/json-endpoints/class.wpcom-json-api-get-site-endpoint.php
index c2d9a28a67165..01fb62d246b4a 100644
--- a/projects/plugins/jetpack/json-endpoints/class.wpcom-json-api-get-site-endpoint.php
+++ b/projects/plugins/jetpack/json-endpoints/class.wpcom-json-api-get-site-endpoint.php
@@ -79,6 +79,7 @@ class WPCOM_JSON_API_GET_Site_Endpoint extends WPCOM_JSON_API_Endpoint {
 		'is_wpcom_staging_site'       => '(bool) If the site is a WP.com staging site.',
 		'user_interactions'           => '(array) An array of user interactions with a site.',
 		'was_ecommerce_trial'         => '(bool) If the site ever used an eCommerce trial.',
+		'wpcom_site_setup'            => '(string) The WP.com site setup identifier.',
 	);
 
 	/**
@@ -201,6 +202,7 @@ class WPCOM_JSON_API_GET_Site_Endpoint extends WPCOM_JSON_API_Endpoint {
 		'wpcom_production_blog_id',
 		'wpcom_staging_blog_ids',
 		'can_blaze',
+		'wpcom_site_setup',
 	);
 
 	/**
@@ -878,6 +880,9 @@ function ( $key ) use ( $visible_options ) {
 				case 'can_blaze':
 					$options[ $key ] = $site->can_blaze();
 					break;
+				case 'wpcom_site_setup':
+					$options[ $key ] = $site->get_wpcom_site_setup();
+					break;
 			}
 		}
 
diff --git a/projects/plugins/jetpack/sal/class.json-api-site-base.php b/projects/plugins/jetpack/sal/class.json-api-site-base.php
index f0cfd93ca1292..2eeaa8930d223 100644
--- a/projects/plugins/jetpack/sal/class.json-api-site-base.php
+++ b/projects/plugins/jetpack/sal/class.json-api-site-base.php
@@ -1501,4 +1501,13 @@ abstract public function get_wpcom_staging_blog_ids();
 	public function can_blaze() {
 		return (bool) Blaze::site_supports_blaze( $this->blog_id );
 	}
+
+	/**
+	 * Return site's setup identifier.
+	 *
+	 * @return string
+	 */
+	public function get_wpcom_site_setup() {
+		return get_option( 'wpcom_site_setup' );
+	}
 }