diff --git a/projects/plugins/jetpack/changelog/add-option-to-sites-api b/projects/plugins/jetpack/changelog/add-option-to-sites-api
new file mode 100644
index 0000000000000..e06acc3799f0b
--- /dev/null
+++ b/projects/plugins/jetpack/changelog/add-option-to-sites-api
@@ -0,0 +1,4 @@
+Significance: minor
+Type: other
+
+Add new option to site options api
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 1b844326cd2d1..43e738dcf68a1 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
@@ -211,6 +211,7 @@ class WPCOM_JSON_API_GET_Site_Endpoint extends WPCOM_JSON_API_Endpoint {
 		'blogging_prompts_settings',
 		'launchpad_screen',
 		'launchpad_checklist_tasks_statuses',
+		'migration_source_site_domain',
 		'wpcom_production_blog_id',
 		'wpcom_staging_blog_ids',
 		'can_blaze',
@@ -902,6 +903,9 @@ protected function render_option_keys( &$options_response_keys ) {
 				case 'launchpad_checklist_tasks_statuses':
 					$options[ $key ] = $site->get_launchpad_checklist_tasks_statuses();
 					break;
+				case 'migration_source_site_domain':
+					$options[ $key ] = $site->get_migration_source_site_domain();
+					break;
 				case 'wpcom_production_blog_id':
 					$options[ $key ] = $site->get_wpcom_production_blog_id();
 					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 0a0e899cc691b..12d0eb89a7f49 100644
--- a/projects/plugins/jetpack/sal/class.json-api-site-base.php
+++ b/projects/plugins/jetpack/sal/class.json-api-site-base.php
@@ -1562,6 +1562,15 @@ public function get_launchpad_checklist_tasks_statuses() {
 		return array();
 	}
 
+	/**
+	 * Get site option for migration source site domain
+	 *
+	 * @return string
+	 */
+	public function get_migration_source_site_domain() {
+		return get_option( 'migration_source_site_domain', '' );
+	}
+
 	/**
 	 * Detect whether a site is WordPress.com Staging Site.
 	 *