diff --git a/repo/rest-api/tests/mocha/helpers/happyPathRequestBuilders.js b/repo/rest-api/tests/mocha/helpers/happyPathRequestBuilders.js
index 283aa6fbd1..27c817621f 100644
--- a/repo/rest-api/tests/mocha/helpers/happyPathRequestBuilders.js
+++ b/repo/rest-api/tests/mocha/helpers/happyPathRequestBuilders.js
@@ -11,8 +11,10 @@ module.exports.getItemGetRequests = ( requestInputs ) => ( [
 	() => rbf.newGetItemAliasesInLanguageRequestBuilder( requestInputs.itemId, 'en' ),
 	() => rbf.newGetItemAliasesRequestBuilder( requestInputs.itemId ),
 	() => rbf.newGetItemDescriptionRequestBuilder( requestInputs.itemId, 'en' ),
+	() => rbf.newGetItemDescriptionWithFallbackRequestBuilder( requestInputs.itemId, 'en' ),
 	() => rbf.newGetItemDescriptionsRequestBuilder( requestInputs.itemId ),
 	() => rbf.newGetItemLabelRequestBuilder( requestInputs.itemId, 'en' ),
+	() => rbf.newGetItemLabelWithFallbackRequestBuilder( requestInputs.itemId, 'en' ),
 	() => rbf.newGetItemLabelsRequestBuilder( requestInputs.itemId ),
 	() => rbf.newGetStatementRequestBuilder( requestInputs.statementId ),
 	() => rbf.newGetSitelinksRequestBuilder( requestInputs.itemId ),
@@ -22,9 +24,11 @@ module.exports.getItemGetRequests = ( requestInputs ) => ( [
 module.exports.getPropertyGetRequests = ( requestInputs ) => ( [
 	() => rbf.newGetPropertyRequestBuilder( requestInputs.propertyId ),
 	() => rbf.newGetPropertyLabelRequestBuilder( requestInputs.propertyId, 'en' ),
+	() => rbf.newGetPropertyLabelWithFallbackRequestBuilder( requestInputs.propertyId, 'en' ),
 	() => rbf.newGetPropertyLabelsRequestBuilder( requestInputs.propertyId ),
 	() => rbf.newGetPropertyDescriptionsRequestBuilder( requestInputs.propertyId ),
 	() => rbf.newGetPropertyDescriptionRequestBuilder( requestInputs.propertyId, 'en' ),
+	() => rbf.newGetPropertyDescriptionWithFallbackRequestBuilder( requestInputs.propertyId, 'en' ),
 	() => rbf.newGetPropertyAliasesRequestBuilder( requestInputs.propertyId ),
 	() => rbf.newGetPropertyAliasesInLanguageRequestBuilder( requestInputs.propertyId, 'en' ),
 	() => rbf.newGetPropertyStatementsRequestBuilder( requestInputs.propertyId ),
diff --git a/repo/rest-api/tests/phpunit/RouteHandlers/RouteHandlersTest.php b/repo/rest-api/tests/phpunit/RouteHandlers/RouteHandlersTest.php
index 2ae5e1c05e..f9a8c1b522 100644
--- a/repo/rest-api/tests/phpunit/RouteHandlers/RouteHandlersTest.php
+++ b/repo/rest-api/tests/phpunit/RouteHandlers/RouteHandlersTest.php
@@ -40,10 +40,14 @@
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemDescription\GetItemDescriptionResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemDescriptions\GetItemDescriptions;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemDescriptions\GetItemDescriptionsResponse;
+use Wikibase\Repo\RestApi\Application\UseCases\GetItemDescriptionWithFallback\GetItemDescriptionWithFallback;
+use Wikibase\Repo\RestApi\Application\UseCases\GetItemDescriptionWithFallback\GetItemDescriptionWithFallbackResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemLabel\GetItemLabel;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemLabel\GetItemLabelResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemLabels\GetItemLabels;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemLabels\GetItemLabelsResponse;
+use Wikibase\Repo\RestApi\Application\UseCases\GetItemLabelWithFallback\GetItemLabelWithFallback;
+use Wikibase\Repo\RestApi\Application\UseCases\GetItemLabelWithFallback\GetItemLabelWithFallbackResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemStatement\GetItemStatement;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemStatements\GetItemStatements;
 use Wikibase\Repo\RestApi\Application\UseCases\GetItemStatements\GetItemStatementsResponse;
@@ -57,10 +61,14 @@
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyDescription\GetPropertyDescriptionResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyDescriptions\GetPropertyDescriptions;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyDescriptions\GetPropertyDescriptionsResponse;
+use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyDescriptionWithFallback\GetPropertyDescriptionWithFallback;
+use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyDescriptionWithFallback\GetPropertyDescriptionWithFallbackResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyLabel\GetPropertyLabel;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyLabel\GetPropertyLabelResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyLabels\GetPropertyLabels;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyLabels\GetPropertyLabelsResponse;
+use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyLabelWithFallback\GetPropertyLabelWithFallback;
+use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyLabelWithFallback\GetPropertyLabelWithFallbackResponse;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyStatement\GetPropertyStatement;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyStatements\GetPropertyStatements;
 use Wikibase\Repo\RestApi\Application\UseCases\GetPropertyStatements\GetPropertyStatementsResponse;
@@ -313,6 +321,22 @@ public function routeHandlersProvider(): Generator {
 				[ new ItemRedirect( 'Q123' ), $hasHttpStatus( 308 ) ],
 			],
 		] ];
+		yield 'GetItemDescriptionWithFallback' => [ [
+			'useCase' => GetItemDescriptionWithFallback::class,
+			'useCaseResponse' => new GetItemDescriptionWithFallbackResponse(
+				new Description( 'en', 'root vegetable' ),
+				$lastModified,
+				123
+			),
+			'validRequest' => [ 'pathParams' => [ 'item_id' => 'Q1', 'language_code' => 'en' ] ],
+			'expectedExceptions' => [
+				[
+					new UseCaseError( UseCaseError::INVALID_PATH_PARAMETER, '', [ 'parameter' => 'item_id' ] ),
+					$hasErrorCode ( UseCaseError::INVALID_PATH_PARAMETER ),
+				],
+				[ new ItemRedirect( 'Q123' ), $hasHttpStatus( 308 ) ],
+			],
+		] ];
 		yield 'GetItemDescriptions' => [ [
 			'useCase' => GetItemDescriptions::class,
 			'useCaseResponse' => new GetItemDescriptionsResponse( new Descriptions(), $lastModified, 123 ),
@@ -341,6 +365,22 @@ public function routeHandlersProvider(): Generator {
 				[ new ItemRedirect( 'Q123' ), $hasHttpStatus( 308 ) ],
 			],
 		] ];
+		yield 'GetItemLabelWithFallback' => [ [
+			'useCase' => GetItemLabelWithFallback::class,
+			'useCaseResponse' => new GetItemLabelWithFallbackResponse(
+				new Label( 'en', 'potato' ),
+				$lastModified,
+				123
+			),
+			'validRequest' => [ 'pathParams' => [ 'item_id' => 'Q1', 'language_code' => 'en' ] ],
+			'expectedExceptions' => [
+				[
+					new UseCaseError( UseCaseError::INVALID_PATH_PARAMETER, '', [ 'parameter' => 'item_id' ] ),
+					$hasErrorCode ( UseCaseError::INVALID_PATH_PARAMETER ),
+				],
+				[ new ItemRedirect( 'Q123' ), $hasHttpStatus( 308 ) ],
+			],
+		] ];
 		yield 'GetItemLabels' => [ [
 			'useCase' => GetItemLabels::class,
 			'useCaseResponse' => new GetItemLabelsResponse( new Labels(), $lastModified, 123 ),
@@ -454,6 +494,19 @@ public function routeHandlersProvider(): Generator {
 				$hasErrorCode( UseCaseError::RESOURCE_NOT_FOUND ),
 			] ],
 		] ];
+		yield 'GetPropertyDescriptionWithFallback' => [ [
+			'useCase' => GetPropertyDescriptionWithFallback::class,
+			'useCaseResponse' => new GetPropertyDescriptionWithFallbackResponse(
+				new Description( 'en', 'property description' ),
+				$lastModified,
+				123
+			),
+			'validRequest' => [ 'pathParams' => [ 'property_id' => 'P1', 'language_code' => 'en' ] ],
+			'expectedExceptions' => [ [
+				UseCaseError::newResourceNotFound( 'property' ),
+				$hasErrorCode( UseCaseError::RESOURCE_NOT_FOUND ),
+			] ],
+		] ];
 		yield 'GetPropertyDescriptions' => [ [
 			'useCase' => GetPropertyDescriptions::class,
 			'useCaseResponse' => new GetPropertyDescriptionsResponse( new Descriptions(), $lastModified, 123 ),
@@ -472,6 +525,15 @@ public function routeHandlersProvider(): Generator {
 				$hasErrorCode( UseCaseError::RESOURCE_NOT_FOUND ),
 			] ],
 		] ];
+		yield 'GetPropertyLabelWithFallback' => [ [
+			'useCase' => GetPropertyLabelWithFallback::class,
+			'useCaseResponse' => new GetPropertyLabelWithFallbackResponse( new Label( 'en', 'instance of' ), $lastModified, 123 ),
+			'validRequest' => [ 'pathParams' => [ 'property_id' => 'P1', 'language_code' => 'en' ] ],
+			'expectedExceptions' => [ [
+				UseCaseError::newResourceNotFound( 'property' ),
+				$hasErrorCode( UseCaseError::RESOURCE_NOT_FOUND ),
+			] ],
+		] ];
 		yield 'GetPropertyLabels' => [ [
 			'useCase' => GetPropertyLabels::class,
 			'useCaseResponse' => new GetPropertyLabelsResponse( new Labels(), $lastModified, 123 ),