Fix balances methods (#864)

src/ExchangeSharp/API/Exchanges/MEXC/ExchangeMEXCAPI.cs

@@ -241,7 +241,6 @@ protected override async Task<Dictionary<string, decimal>> OnGetAmountsAvailable
 						{
 							Currency = x["asset"].Value<string>(),
 							AvailableBalance = x["free"].Value<decimal>()
-							                   + x["locked"].Value<decimal>()
 						}
 				)
 				.ToDictionary(k => k.Currency, v => v.AvailableBalance);
@@ -475,6 +474,51 @@ await _socket.SendMessageAsync(new WebSocketSubscription
 					}
 			);
 		}
+
+		protected override Task ProcessRequestAsync(
+				IHttpWebRequest request,
+				Dictionary<string, object>? payload
+		)
+		{
+			if (
+					CanMakeAuthenticatedRequest(payload)
+					|| (payload == null && request.RequestUri.AbsoluteUri.Contains("userDataStream"))
+			)
+			{
+				request.AddHeader("X-MEXC-APIKEY", PublicApiKey!.ToUnsecureString());
+			}
+			return base.ProcessRequestAsync(request, payload);
+		}
+
+		protected override Uri ProcessRequestUrl(
+				UriBuilder url,
+				Dictionary<string, object>? payload,
+				string? method
+		)
+		{
+			if (CanMakeAuthenticatedRequest(payload))
+			{
+				// payload is ignored, except for the nonce which is added to the url query - bittrex puts all the "post" parameters in the url query instead of the request body
+				var query = (url.Query ?? string.Empty).Trim('?', '&');
+				string newQuery =
+						"timestamp="
+						+ payload!["nonce"].ToStringInvariant()
+						+ (query.Length != 0 ? "&" + query : string.Empty)
+						+ (
+								payload.Count > 1
+										? "&" + CryptoUtility.GetFormForPayload(payload, false)
+										: string.Empty
+						);
+				string signature = CryptoUtility.SHA256Sign(
+						newQuery,
+						CryptoUtility.ToUnsecureBytesUTF8(PrivateApiKey)
+				);
+				newQuery += "&signature=" + signature;
+				url.Query = newQuery;
+				return url.Uri;
+			}
+			return base.ProcessRequestUrl(url, payload, method);
+		}
 
 		private async Task<JToken> GetBalance()
 		{
@@ -515,6 +559,7 @@ private static ExchangeOrderResult ParseOrder(JToken token)
 				Amount = token["origQty"].ConvertInvariant<decimal>(),
 				AmountFilled = token["executedQty"].ConvertInvariant<decimal>(),
 				Price = token["price"].ConvertInvariant<decimal>(),
+				AveragePrice = token["price"].ConvertInvariant<decimal>(),
 				IsBuy = token["side"].ToStringInvariant() == "BUY",
 				OrderDate = token["time"].ConvertInvariant<long>().UnixTimeStampToDateTimeMilliseconds(),
 				Result = ParseOrderStatus(token["status"].ToStringInvariant())

src/ExchangeSharpConsole/Options/BalancesOption.cs

@@ -0,0 +1,70 @@
+using CommandLine;
+using ExchangeSharpConsole.Options.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExchangeSharpConsole.Options;
+
+[Verb(
+		"balances",
+		HelpText = "Displays the account balances for an exchange."
+)]
+public class BalancesOption : BaseOption, IOptionPerExchange, IOptionWithKey
+{
+	public override async Task RunCommand()
+	{
+		using var api = await GetExchangeInstanceAsync(ExchangeName);
+
+		api.LoadAPIKeys(KeyPath);
+
+		if (Mode.Equals("all", StringComparison.OrdinalIgnoreCase))
+		{
+			Console.WriteLine("All Balances:");
+
+			var balances = await api.GetAmountsAsync();
+
+			foreach (var balance in balances)
+			{
+				Console.WriteLine($"{balance.Key}: {balance.Value}");
+			}
+
+			Console.WriteLine();
+		}
+		else if (Mode.Equals("trade", StringComparison.OrdinalIgnoreCase))
+		{
+			Console.WriteLine("Balances available for trading:");
+
+			var balances = await api.GetAmountsAvailableToTradeAsync();
+
+			foreach (var balance in balances)
+			{
+				Console.WriteLine($"{balance.Key}: {balance.Value}");
+			}
+
+			Console.WriteLine();
+		}
+		else
+		{
+			throw new ArgumentException($"Invalid mode: {Mode}");
+		}
+	}
+
+	public string ExchangeName { get; set; }
+
+	[Option(
+		'm',
+		"mode",
+		Required = true,
+		HelpText = "Mode of execution."
+				+ "\n\tPossible values are \"all\" or \"trade\"."
+				+ "\n\t\tall: Displays all funds, regardless if they are locked or not."
+				+ "\n\t\ttrade: Displays the funds that can be used, at the current moment, to trade."
+	)]
+
+	public string Mode { get; set; }
+
+	public string KeyPath { get; set; }
+}

src/ExchangeSharpConsole/Program.cs

@@ -14,6 +14,7 @@ public partial class Program
 
 		public Type[] CommandOptions { get; } =
 				{
+								typeof(BalancesOption),
 								typeof(BuyOption),
 								typeof(CancelOrderOption),
 								typeof(CandlesOption),