diff --git a/.changeset/little-cherries-judge.md b/.changeset/little-cherries-judge.md
new file mode 100644
index 00000000..a845151c
--- /dev/null
+++ b/.changeset/little-cherries-judge.md
@@ -0,0 +1,2 @@
+---
+---
diff --git a/src/verification/EventVerifier.ts b/src/verification/EventVerifier.ts
index 81c8269b..19d7a0c0 100644
--- a/src/verification/EventVerifier.ts
+++ b/src/verification/EventVerifier.ts
@@ -6,6 +6,7 @@ import { ChainMinimumFee } from '@rosen-bridge/minimum-fee';
 import EventBoxes from '../event/EventBoxes';
 import { ConfirmedEventEntity } from '../db/entities/ConfirmedEventEntity';
 import { EventStatus } from '../utils/constants';
+import EventSynchronization from '../synchronization/EventSynchronization';
 
 class EventVerifier {
   /**
@@ -76,7 +77,15 @@ class EventVerifier {
       type === TransactionType.reward
     )
       return true;
-    else return false;
+    else {
+      if (
+        eventEntity.status === EventStatus.pendingPayment &&
+        type === TransactionType.reward
+      ) {
+        EventSynchronization.getInstance().addEventToQueue(eventEntity.id);
+      }
+      return false;
+    }
   };
 }
 
diff --git a/tests/synchronization/mocked/EventSynchronization.mock.ts b/tests/synchronization/mocked/EventSynchronization.mock.ts
new file mode 100644
index 00000000..ce76e142
--- /dev/null
+++ b/tests/synchronization/mocked/EventSynchronization.mock.ts
@@ -0,0 +1,46 @@
+import { Mock } from 'vitest';
+import EventSynchronization from '../../../src/synchronization/EventSynchronization';
+
+class EventSynchronizationMock {
+  private static mockedEventSynchronization: Record<string, any>;
+
+  /**
+   * resets all mocked functions of EventSynchronization
+   */
+  static resetMock = () => {
+    this.mockedEventSynchronization = {};
+  };
+
+  /**
+   * mocks EventSynchronization.getInstance to return mocked object
+   */
+  static mock = () => {
+    const functionSpy = vi.spyOn(EventSynchronization, 'getInstance');
+    functionSpy.mockReturnValue(
+      this.mockedEventSynchronization as EventSynchronization
+    );
+  };
+
+  /**
+   * mocks EventSynchronization.addEventToQueue
+   */
+  static mockAddEventToQueue = () => {
+    this.mockedEventSynchronization.addEventToQueue = vi.fn();
+    const functionSpy = vi.spyOn(
+      this.mockedEventSynchronization,
+      'addEventToQueue'
+    );
+    functionSpy.mockImplementation(() => null);
+  };
+
+  /**
+   * returns vitest mock object of the corresponding function
+   * @param name function name
+   * @returns the mock object
+   */
+  static getMockedFunction = (name: string): Mock<any> => {
+    return this.mockedEventSynchronization[name];
+  };
+}
+
+export default EventSynchronizationMock;
diff --git a/tests/verification/EventVerifier.spec.ts b/tests/verification/EventVerifier.spec.ts
index 86b69deb..18017f90 100644
--- a/tests/verification/EventVerifier.spec.ts
+++ b/tests/verification/EventVerifier.spec.ts
@@ -10,6 +10,8 @@ import DatabaseActionMock from '../db/mocked/DatabaseAction.mock';
 import { ChainMinimumFee } from '@rosen-bridge/minimum-fee';
 import { ConfirmedEventEntity } from '../../src/db/entities/ConfirmedEventEntity';
 import { EventStatus } from '../../src/utils/constants';
+import EventSynchronizationMock from '../synchronization/mocked/EventSynchronization.mock';
+import TestUtils from '../testUtils/TestUtils';
 
 describe('EventVerifier', () => {
   describe('isEventConfirmedEnough', () => {
@@ -265,6 +267,11 @@ describe('EventVerifier', () => {
   });
 
   describe('isEventPendingToType', () => {
+    beforeEach(async () => {
+      EventSynchronizationMock.resetMock();
+      EventSynchronizationMock.mock();
+    });
+
     /**
      * @target EventVerifier.isEventPendingToType should return true when
      * type is payment and event status is pending-payment
@@ -331,8 +338,41 @@ describe('EventVerifier', () => {
     it('should return false when type and event status are not compatible', async () => {
       // mock an event
       const mockedEvent = new ConfirmedEventEntity();
+      mockedEvent.status = EventStatus.timeout;
+
+      // run test
+      const result = EventVerifier.isEventPendingToType(
+        mockedEvent,
+        TransactionType.reward
+      );
+
+      // verify returned value
+      expect(result).toEqual(false);
+    });
+
+    /**
+     * @target EventVerifier.isEventPendingToType should return false and add
+     * event to synchronization queue when a reward transaction for a pending-payment
+     * event is received
+     * @dependencies
+     * @scenario
+     * - mock an event with `pending-payment` status
+     * - mock EventSynchronization.addEventToQueue
+     * - run test with `reward` transaction type
+     * - verify returned value
+     * @expected
+     * - returned value should be false
+     * - `addEventToQueue` should got called with the mocked event id
+     */
+    it('should return false and add event to synchronization queue when a reward transaction for a pending-payment event is received', async () => {
+      // mock an event
+      const mockedEvent = new ConfirmedEventEntity();
+      mockedEvent.id = TestUtils.generateRandomId();
       mockedEvent.status = EventStatus.pendingPayment;
 
+      // mock EventSynchronization.addEventToQueue
+      EventSynchronizationMock.mockAddEventToQueue();
+
       // run test
       const result = EventVerifier.isEventPendingToType(
         mockedEvent,
@@ -341,6 +381,11 @@ describe('EventVerifier', () => {
 
       // verify returned value
       expect(result).toEqual(false);
+
+      // `addEventToQueue` should got called
+      expect(
+        EventSynchronizationMock.getMockedFunction('addEventToQueue')
+      ).toHaveBeenCalledWith(mockedEvent.id);
     });
   });
 });