Fixes for Bittrex and Kraken after testing live orders.

src/ExchangeSharp/API/Common/APIRequestMaker.cs

@@ -216,7 +216,7 @@ public async Task<string> MakeRequestAsync(string url, string? baseUrl = null, D
                 using (StreamReader responseStreamReader = new StreamReader(responseStream))
                     responseString = responseStreamReader.ReadToEnd();
 
-                if (response.StatusCode != HttpStatusCode.OK)
+                if (response.StatusCode != HttpStatusCode.OK && response.StatusCode != HttpStatusCode.Created)
                 {
 	                // 404 maybe return empty responseString
 	                if (string.IsNullOrWhiteSpace(responseString))

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

@@ -252,7 +252,25 @@ protected override async Task<IEnumerable<KeyValuePair<string, ExchangeTicker>>>
 		#region OrderBooks
 		protected override async Task<ExchangeOrderBook> OnGetOrderBookAsync(string marketSymbol, int maxCount = 25)
 		{
-			JToken token = await MakeJsonRequestAsync<JToken>("/markets/" + marketSymbol + "/orderbook" + marketSymbol + "&depth=" + maxCount);
+			// Bittrex API allowed values are [1, 25, 500], default is 25.
+			if (maxCount > 100)
+			{
+				maxCount = 500;
+			}
+			else if (maxCount > 25 && maxCount <= 100) // ExchangeSharp default.
+			{
+				maxCount = 25;
+			}
+			else if (maxCount > 1 && maxCount <= 25)
+			{
+				maxCount = 25;
+			}
+			else
+			{
+				maxCount = 1;
+			}
+
+			JToken token = await MakeJsonRequestAsync<JToken>("/markets/" + marketSymbol + "/orderbook" + "?depth=" + maxCount);
 			return ExchangeAPIExtensions.ParseOrderBookFromJTokenDictionaries(token, "ask", "bid", "rate", "quantity", maxCount: maxCount);
 		}
 
@@ -370,7 +388,7 @@ protected override async Task<ExchangeOrderResult> OnPlaceOrderAsync(ExchangeOrd
 			if (order.OrderType == ExchangeSharp.OrderType.Limit)
 			{
 				orderParams.Add("limit", orderPrice);
-				//orderParams.Add("timeInForce", "GOOD_TIL_CANCELLED");
+				orderParams.Add("timeInForce", "GOOD_TIL_CANCELLED");
 			}
 
 			foreach (KeyValuePair<string, object> kv in order.ExtraParameters)

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

@@ -749,13 +749,17 @@ protected override async Task<Dictionary<string, decimal>> OnGetAmountsAvailable
 
 		protected override async Task<ExchangeOrderResult> OnPlaceOrderAsync(ExchangeOrderRequest order)
 		{
+			IEnumerable<ExchangeMarket> markets = await OnGetMarketSymbolsMetadataAsync();
+			ExchangeMarket market = markets.Where(m => m.MarketSymbol == order.MarketSymbol).First<ExchangeMarket>();
+
 			object nonce = await GenerateNonceAsync();
 			Dictionary<string, object> payload = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase)
 			{ { "pair", order.MarketSymbol }, { "type", (order.IsBuy ? "buy" : "sell") }, { "ordertype", order.OrderType.ToString().ToLowerInvariant() }, { "volume", order.RoundAmount().ToStringInvariant() }, { "trading_agreement", "agree" }, { "nonce", nonce }
 			};
 			if (order.OrderType != OrderType.Market)
 			{
-				payload.Add("price", order.Price.ToStringInvariant());
+				int precision = BitConverter.GetBytes(Decimal.GetBits((decimal)market.PriceStepSize)[3])[2];
+				payload.Add("price", Math.Round(order.Price, precision).ToStringInvariant());
 			}
 			order.ExtraParameters.CopyTo(payload);