diff --git a/packages/permission-controller/src/SubjectMetadataController.test.ts b/packages/permission-controller/src/SubjectMetadataController.test.ts
index 6c23a93819..c1756926c1 100644
--- a/packages/permission-controller/src/SubjectMetadataController.test.ts
+++ b/packages/permission-controller/src/SubjectMetadataController.test.ts
@@ -280,4 +280,66 @@ describe('SubjectMetadataController', () => {
       });
     });
   });
+
+  describe('controller actions', () => {
+    it(':getSubjectMetadata returns the subject metadata', () => {
+      const [messenger, hasPermissionsSpy] =
+        getSubjectMetadataControllerMessenger();
+      const controller = new SubjectMetadataController({
+        messenger,
+        subjectCacheLimit: 100,
+      });
+      hasPermissionsSpy.mockImplementationOnce(() => true);
+
+      controller.addSubjectMetadata(
+        getSubjectMetadata('foo.com', 'foo', SubjectType.Snap),
+      );
+
+      controller.addSubjectMetadata(
+        getSubjectMetadata('bar.io', 'bar', SubjectType.Website),
+      );
+
+      expect(
+        messenger.call(
+          'SubjectMetadataController:getSubjectMetadata',
+          'foo.com',
+        ),
+      ).toStrictEqual(getSubjectMetadata('foo.com', 'foo', SubjectType.Snap));
+
+      expect(
+        messenger.call(
+          'SubjectMetadataController:getSubjectMetadata',
+          'bar.io',
+        ),
+      ).toStrictEqual(getSubjectMetadata('bar.io', 'bar', SubjectType.Website));
+    });
+
+    it(':addSubjectMetadata adds passed subject metadata', () => {
+      const [messenger, hasPermissionsSpy] =
+        getSubjectMetadataControllerMessenger();
+      const controller = new SubjectMetadataController({
+        messenger,
+        subjectCacheLimit: 100,
+      });
+      hasPermissionsSpy.mockImplementationOnce(() => true);
+
+      messenger.call(
+        'SubjectMetadataController:addSubjectMetadata',
+        getSubjectMetadata('foo.com', 'foo', SubjectType.Snap),
+      );
+
+      messenger.call(
+        'SubjectMetadataController:addSubjectMetadata',
+        getSubjectMetadata('bar.io', 'bar', SubjectType.Website),
+      );
+
+      expect(controller.getSubjectMetadata('foo.com')).toStrictEqual(
+        getSubjectMetadata('foo.com', 'foo', SubjectType.Snap),
+      );
+
+      expect(controller.getSubjectMetadata('bar.io')).toStrictEqual(
+        getSubjectMetadata('bar.io', 'bar', SubjectType.Website),
+      );
+    });
+  });
 });
diff --git a/packages/permission-controller/src/SubjectMetadataController.ts b/packages/permission-controller/src/SubjectMetadataController.ts
index e37039243f..ab363e5327 100644
--- a/packages/permission-controller/src/SubjectMetadataController.ts
+++ b/packages/permission-controller/src/SubjectMetadataController.ts
@@ -66,9 +66,15 @@ export type GetSubjectMetadata = {
   handler: (origin: SubjectOrigin) => SubjectMetadata | undefined;
 };
 
+export type AddSubjectMetadata = {
+  type: `${typeof controllerName}:addSubjectMetadata`;
+  handler: (metadata: SubjectMetadataToAdd) => void;
+};
+
 export type SubjectMetadataControllerActions =
   | GetSubjectMetadataState
-  | GetSubjectMetadata;
+  | GetSubjectMetadata
+  | AddSubjectMetadata;
 
 export type SubjectMetadataStateChange = ControllerStateChangeEvent<
   typeof controllerName,
@@ -140,6 +146,11 @@ export class SubjectMetadataController extends BaseController<
       `${this.name}:getSubjectMetadata`,
       this.getSubjectMetadata.bind(this),
     );
+
+    this.messagingSystem.registerActionHandler(
+      `${this.name}:addSubjectMetadata`,
+      this.addSubjectMetadata.bind(this),
+    );
   }
 
   /**