diff --git a/uncloud_django_based/uncloud/uncloud_service/models.py b/uncloud_django_based/uncloud/uncloud_service/models.py
index 4f26a99..fb1af50 100644
--- a/uncloud_django_based/uncloud/uncloud_service/models.py
+++ b/uncloud_django_based/uncloud/uncloud_service/models.py
@@ -15,11 +15,9 @@ class MatrixServiceProduct(Product):
             )
     domain = models.CharField(max_length=255, default='domain.tld')
 
-    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
-        if recurring_period == RecurringPeriod.PER_MONTH:
-            return self.monthly_managment_fee
-        else:
-            raise Exception('Invalid recurring period for VM Product pricing.')
+    # Default recurring price is PER_MONT, see Product class.
+    def recurring_price(self):
+        return self.monthly_managment_fee
 
     @staticmethod
     def base_image():
diff --git a/uncloud_django_based/uncloud/uncloud_vm/models.py b/uncloud_django_based/uncloud/uncloud_vm/models.py
index ee8eed1..f56ed0d 100644
--- a/uncloud_django_based/uncloud/uncloud_vm/models.py
+++ b/uncloud_django_based/uncloud/uncloud_vm/models.py
@@ -71,16 +71,9 @@ class VMProduct(Product):
 
     primary_disk = models.ForeignKey('VMDiskProduct', on_delete=models.CASCADE, null=True)
 
-    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
-        # TODO: move magic numbers in variables
-        if recurring_period == RecurringPeriod.PER_MONTH:
-            return self.cores * 3 + self.ram_in_gb * 4
-        elif recurring_period == RecurringPeriod.PER_HOUR:
-            return self.cores * 4.0/(30 * 24) + self.ram_in_gb * 4.5/(30* 24)
-        elif recurring_period == RecurringPeriod.PER_YEAR:
-            return (self.cores * 2.5 + self.ram_in_gb * 3.5) * 12
-        else:
-            raise Exception('Invalid recurring period for VM Product pricing.')
+    # Default recurring price is PER_MONTH, see uncloud_pay.models.Product.
+    def recurring_price(self):
+        return self.cores * 3 + self.ram_in_gb * 4
 
     def __str__(self):
         return "VM {} ({}): {} cores {} gb ram".format(self.uuid,