diff --git a/golem/rpc/api/ethereum_.py b/golem/rpc/api/ethereum_.py
index 9a4dff81f6..4c102a271b 100644
--- a/golem/rpc/api/ethereum_.py
+++ b/golem/rpc/api/ethereum_.py
@@ -143,8 +143,8 @@ def payment(wallet_operation_id: int) -> typing.Optional[dict]:
                 'task_id': o.task,
                 'subtask_id': o.subtask,
                 'charged_from_deposit': o.charged_from_deposit,
-                'accepted_ts': str(o.accepted_ts) if o.accepted_ts else None,
-                'settled_ts': str(o.settled_ts) if o.settled_ts else None,
+                'accepted_ts': o.accepted_ts if o.accepted_ts else None,
+                'settled_ts': o.settled_ts if o.settled_ts else None,
                 'missing_amount': str(o.missing_amount),
                 'created': common.datetime_to_timestamp_utc(o.created_date),
                 'modified': common.datetime_to_timestamp_utc(o.modified_date),
diff --git a/tests/golem/rpc/api/test_ethereum.py b/tests/golem/rpc/api/test_ethereum.py
index a1df3072b2..a482a4d8be 100644
--- a/tests/golem/rpc/api/test_ethereum.py
+++ b/tests/golem/rpc/api/test_ethereum.py
@@ -111,3 +111,24 @@ def test_wallet_operation(self):
             count,
             1,
         )
+
+    def test_operation_type(self):
+        operation_types = model.WalletOperation.TYPE
+        _ = model_factory.WalletOperation(
+            operation_type=operation_types.deposit_transfer,
+        )
+
+        count0, _result0 = self.ets_provider.get_operations(
+            operation_type=operation_types.task_payment,
+        )
+        self.assertEqual(
+            count0,
+            0,
+        )
+        count, _result = self.ets_provider.get_operations(
+            operation_type=operation_types.deposit_transfer,
+        )
+        self.assertEqual(
+            count,
+            1,
+        )