Add ETH and USDC balance check before start/restart bot and autoswap

src/Managing.Application/Trading/Handlers/OpenPositionCommandHandler.cs

@@ -2,6 +2,7 @@
 using Managing.Application.Abstractions.Services;
 using Managing.Application.Trading.Commands;
 using Managing.Common;
+using Managing.Core.Exceptions;
 using Managing.Domain.Shared.Helpers;
 using Managing.Domain.Trades;
 using static Managing.Common.Enums;
@@ -19,7 +20,6 @@ namespace Managing.Application.Trading.Handlers
         {
             var account = await accountService.GetAccount(request.AccountName, hideSecrets: false, getBalance: false);
 
-
             var initiator = request.IsForPaperTrading ? PositionInitiator.PaperTrading : request.Initiator;
             var position = new Position(Guid.NewGuid(), request.AccountName, request.Direction,
                 request.Ticker,
@@ -44,6 +44,18 @@ namespace Managing.Application.Trading.Handlers
                     $"Bot trading balance of {balanceToRisk} USD is less than the minimum {Constants.GMX.Config.MinimumPositionAmount} USD required to trade");
             }
 
+            // Gas fee check for EVM exchanges
+            if (account.Exchange == TradingExchanges.Evm || account.Exchange == TradingExchanges.GmxV2)
+            {
+                var gasFeeUsd = await exchangeService.GetFee(account);
+                if (gasFeeUsd > Constants.GMX.Config.MaximumGasFeeUsd)
+                {
+                    throw new InsufficientFundsException(
+                        $"Gas fee too high for position opening: {gasFeeUsd:F2} USD (threshold: {Constants.GMX.Config.MaximumGasFeeUsd} USD). Position opening cancelled.",
+                        InsufficientFundsType.InsufficientEth);
+                }
+            }
+
             var price = request.IsForPaperTrading && request.Price.HasValue
                 ? request.Price.Value
                 : await exchangeService.GetPrice(account, request.Ticker, DateTime.Now);