Withdrawal fees

src/ExchangeSharp/API/Exchanges/Bitfinex/ExchangeBitfinexAPI.cs

@@ -777,6 +777,8 @@ protected override async Task<ExchangeWithdrawalResponse> OnWithdrawAsync(Exchan
 
 			resp.Id = result[0]["withdrawal_id"].ToStringInvariant();
 			resp.Message = result[0]["message"].ToStringInvariant();
+			resp.Fee = result[0].Value<decimal?>("WITHDRAWAL_FEE");
+
 			return resp;
 		}
 

src/ExchangeSharp/API/Exchanges/Bittrex/ExchangeBittrexAPI.cs

@@ -546,7 +546,8 @@ protected override async Task<ExchangeWithdrawalResponse> OnWithdrawAsync(Exchan
 			ExchangeWithdrawalResponse withdrawalResponse = new ExchangeWithdrawalResponse
 			{
 				Id = result["id"].ToStringInvariant(),
-				Message = result["status"].ToStringInvariant()
+				Message = result["status"].ToStringInvariant(),
+				Fee = result.Value<decimal?>("txCost")
 			};
 
 			return withdrawalResponse;

src/ExchangeSharp/API/Exchanges/Coinbase/ExchangeCoinbaseAPI.cs

@@ -670,10 +670,12 @@ protected override async Task<ExchangeWithdrawalResponse> OnWithdrawAsync(Exchan
 			}
 
 			var result = await MakeJsonRequestAsync<WithdrawalResult>("/withdrawals/crypto", null, payload, "POST");
+			var feeParsed = decimal.TryParse(result.Fee, out var fee);
 
 			return new ExchangeWithdrawalResponse
 			{
-				Id = result.Id
+				Id = result.Id,
+				Fee = feeParsed ? fee : (decimal?)null
 			};
 		}
 

src/ExchangeSharp/API/Exchanges/FTX/ExchangeFTXAPI.cs

@@ -348,7 +348,8 @@ protected override async Task<ExchangeWithdrawalResponse> OnWithdrawAsync(Exchan
 
 			return new ExchangeWithdrawalResponse
 			{
-				Id = result["id"].ToString()
+				Id = result["id"].ToString(),
+				Fee = result.Value<decimal?>("fee")
 			};
 		}
 

src/ExchangeSharp/API/Exchanges/Kraken/ExchangeKrakenAPI.cs

@@ -456,7 +456,8 @@ protected override async Task<ExchangeWithdrawalResponse> OnWithdrawAsync(Exchan
 
 			return new ExchangeWithdrawalResponse
 			{
-				Id = result["refid"].ToString()
+				Id = result["refid"].ToString(),
+				Fee = result.Value<decimal?>("fee")
 			};
 		}
 

src/ExchangeSharp/Model/ExchangeWithdrawalResponse.cs

@@ -1,4 +1,4 @@
-/*
+/*
 MIT LICENSE
 
 Copyright 2017 Digital Ruby, LLC - http://www.digitalruby.com
@@ -26,11 +26,14 @@ public sealed class ExchangeWithdrawalResponse
         /// <summary>Whether the withdrawal was successful</summary>
         public bool Success { get; set; } = true;
 
-        /// <summary>Returns a <see cref="System.String" /> that represents this instance.</summary>
-        /// <returns>A <see cref="System.String" /> that represents this instance.</returns>
-        public override string ToString()
+		/// <summary>Fee for the withdrawal</summary>
+		public decimal? Fee { get; set; }
+
+		/// <summary>Returns a <see cref="System.String" /> that represents this instance.</summary>
+		/// <returns>A <see cref="System.String" /> that represents this instance.</returns>
+		public override string ToString()
         {
             return $"Success: {Success} Id: {Id ?? "null"} Message: {Message ?? "null"}";
         }
     }
-}
+}