diff --git a/api/v1/serializers/payment.py b/api/v1/serializers/payment.py
index 4330401f..0ac2d12a 100644
--- a/api/v1/serializers/payment.py
+++ b/api/v1/serializers/payment.py
@@ -62,6 +62,7 @@ class AuthorBalanceSerializer(serializers.ModelSerializer):
             'payment',
             'card',
             'cause',
+            'created_at',
         )
 
         read_only_fields = (
@@ -69,6 +70,7 @@ class AuthorBalanceSerializer(serializers.ModelSerializer):
             'author',
             'type',
             'payment',
+            'created_at',
         )
 
     def get_payment(self, instance):