diff --git a/lib/view_model/exchange/exchange_view_model.dart b/lib/view_model/exchange/exchange_view_model.dart
index f9d832843..b03415f4a 100644
--- a/lib/view_model/exchange/exchange_view_model.dart
+++ b/lib/view_model/exchange/exchange_view_model.dart
@@ -296,7 +296,7 @@ abstract class ExchangeViewModelBase with Store {
   }
 
   Future<void> _calculateBestRate() async {
-    final amount = limits.min ?? limits.max ?? 1;
+    final amount = double.tryParse(isFixedRateMode ? receiveAmount : depositAmount) ?? 1;
 
     final result = await Future.wait<double>(
         _tradeAvailableProviders