Updated to version 12.5.1

CryptoExchange.Net.UnitTests/SocketRoutingTests/SubscriptionTests.cs

@@ -0,0 +1,130 @@
+using CryptoExchange.Net.Objects;
+using CryptoExchange.Net.Sockets;
+using CryptoExchange.Net.Sockets.Default;
+using CryptoExchange.Net.Sockets.Default.Routing;
+using CryptoExchange.Net.UnitTests.Implementations;
+using Microsoft.Extensions.Logging.Abstractions;
+using NUnit.Framework;
+using System;
+
+namespace CryptoExchange.Net.UnitTests.SocketRoutingTests
+{
+    [TestFixture]
+    public class SubscriptionTests
+    {
+        [Test]
+        public void Handle_Should_OnlyCompleteSubscriptionQuery_ForMatchingTopic()
+        {
+            // arrange
+            var topicASubscription = new TopicSubscription("topic-a");
+            var topicBSubscription = new TopicSubscription("topic-b");
+            var topicAQuery = topicASubscription.CreateSubscriptionQuery(null!)!;
+            var topicBQuery = topicBSubscription.CreateSubscriptionQuery(null!)!;
+
+            // act
+            var topicAHandled = topicASubscription.Handle("type", "topic-a", null!, DateTime.UtcNow, "original", "data");
+            var topicBHandled = topicBSubscription.Handle("type", "topic-a", null!, DateTime.UtcNow, "original", "data");
+
+            // assert
+            Assert.That(topicAHandled, Is.True);
+            Assert.That(topicBHandled, Is.False);
+            Assert.That(topicAQuery.Completed, Is.True);
+            Assert.That(topicAQuery.Success, Is.True);
+            Assert.That(topicBQuery.Completed, Is.False);
+        }
+
+        [Test]
+        public void Handle_Should_CompleteSubscriptionQuery_BeforeInvokingMatchingHandler()
+        {
+            // arrange
+            Query? query = null;
+            var queryCompletedWhenHandlerInvoked = false;
+            var subscription = new TopicSubscription("topic", () => queryCompletedWhenHandlerInvoked = query!.Completed);
+            query = subscription.CreateSubscriptionQuery(null!)!;
+
+            // act
+            subscription.Handle("type", "topic", null!, DateTime.UtcNow, "original", "data");
+
+            // assert
+            Assert.That(queryCompletedWhenHandlerInvoked, Is.True);
+        }
+
+        [TestCase(null)]
+        [TestCase("topic")]
+        public void Handle_Should_CompleteSubscriptionQuery_ForUnfilteredRoute(string? topicFilter)
+        {
+            // arrange
+            var subscription = new TopicSubscription(topic: null);
+            var query = subscription.CreateSubscriptionQuery(null!)!;
+
+            // act
+            var handled = subscription.Handle("type", topicFilter, null!, DateTime.UtcNow, "original", "data");
+
+            // assert
+            Assert.That(handled, Is.True);
+            Assert.That(query.Completed, Is.True);
+            Assert.That(query.Success, Is.True);
+        }
+
+        [Test]
+        public void Handle_Should_TreatEmptyTopicFilterAsUnfilteredRoute()
+        {
+            // arrange
+            var subscription = new TopicSubscription(string.Empty);
+            var query = subscription.CreateSubscriptionQuery(null!)!;
+
+            // act
+            var handled = subscription.Handle("type", "topic", null!, DateTime.UtcNow, "original", "data");
+
+            // assert
+            Assert.That(handled, Is.True);
+            Assert.That(query.Completed, Is.True);
+            Assert.That(query.Success, Is.True);
+        }
+
+        [Test]
+        public void Handle_Should_CompleteSubscriptionQuery_ForAnyMatchingTopic()
+        {
+            // arrange
+            var subscription = new TopicSubscription(["topic-a", "topic-b"]);
+            var query = subscription.CreateSubscriptionQuery(null!)!;
+
+            // act
+            var handled = subscription.Handle("type", "topic-b", null!, DateTime.UtcNow, "original", "data");
+
+            // assert
+            Assert.That(handled, Is.True);
+            Assert.That(query.Completed, Is.True);
+            Assert.That(query.Success, Is.True);
+        }
+
+        private sealed class TopicSubscription : Subscription
+        {
+            public TopicSubscription(string? topic, Action? handler = null)
+                : base(NullLogger.Instance, false)
+            {
+                MessageRouter = MessageRouter.CreateForEvent<string>("type", topic, (_, _, _, _) =>
+                {
+                    handler?.Invoke();
+                    return CallResult.Ok();
+                });
+            }
+
+            public TopicSubscription(string[] topics)
+                : base(NullLogger.Instance, false)
+            {
+                MessageRouter = MessageRouter.CreateForEvent<string>("type", topics, (_, _, _, _) => CallResult.Ok());
+            }
+
+            protected override Query? GetSubQuery(SocketConnection connection)
+            {
+                return new TestQuery(new TestSocketMessage { Id = 1, Data = "Sub" }, false)
+                {
+                    TimeoutBehavior = TimeoutBehavior.Succeed
+                };
+            }
+
+            protected override Query? GetUnsubQuery(SocketConnection connection) => null;
+        }
+    }
+}

CryptoExchange.Net/Clients/RestApiClient.cs

@@ -198,7 +198,7 @@ namespace CryptoExchange.Net.Clients
             string? cacheKey = null;
             if (ShouldCache(definition))
             {
-                cacheKey = definition.FullUrl + definition + uriParameters?.ToFormData();
+                cacheKey = GetCacheKey(definition, uriParameters);
                 _logger.CheckingCache(cacheKey);
                 var cachedValue = _cache.Get(cacheKey, ClientOptions.CachingMaxAge);
                 if (cachedValue != null)
@@ -800,6 +800,13 @@ namespace CryptoExchange.Net.Clients
             && definition.Method == HttpMethod.Get
             && !definition.PreventCaching;
 
+        /// <summary>
+        /// Produce a unique cache key for the request based on the request definition and parameters.
+        /// </summary>
+        protected virtual string GetCacheKey(RequestDefinition definition, Parameters? parameters)
+        {
+            return definition.FullUrl + definition + parameters?.ToFormData();
+        }
 
         /// <inheritdoc />
         public virtual void SetOptions(UpdateOptions options)
@@ -889,6 +896,12 @@ namespace CryptoExchange.Net.Clients
 
             ApiCredentials = (TApiCredentials?)options.ApiCredentials?.Copy() ?? ApiCredentials;
         }
+
+        /// <inheritdoc />
+        protected override string GetCacheKey(RequestDefinition definition, Parameters? parameters)
+        {
+            return definition.FullUrl + definition + parameters?.ToFormData() + GetAuthenticationProvider()?.Key;
+        }
     }
 
     /// <inheritdoc />

CryptoExchange.Net/CryptoExchange.Net.csproj

@@ -6,9 +6,9 @@
     <PackageId>CryptoExchange.Net</PackageId>
     <Authors>JKorf</Authors>
     <Description>CryptoExchange.Net is a base library which is used to implement different cryptocurrency (exchange) API's. It provides a standardized way of implementing different API's, which results in a very similar experience for users of the API implementations.</Description>
-    <PackageVersion>12.5.0</PackageVersion>
+    <PackageVersion>12.5.1</PackageVersion>
-    <AssemblyVersion>12.5.0</AssemblyVersion>
+    <AssemblyVersion>12.5.1</AssemblyVersion>
-    <FileVersion>12.5.0</FileVersion>
+    <FileVersion>12.5.1</FileVersion>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <PackageTags>OKX;OKX.Net;Mexc;Mexc.Net;Kucoin;Kucoin.Net;Kraken;Kraken.Net;Huobi;Huobi.Net;CoinEx;CoinEx.Net;Bybit;Bybit.Net;Bitget;Bitget.Net;Bitfinex;Bitfinex.Net;Binance;Binance.Net;CryptoCurrency;CryptoCurrency Exchange;CryptoExchange.Net</PackageTags>
     <RepositoryType>git</RepositoryType>

CryptoExchange.Net/OrderBook/SymbolOrderBook.cs

@@ -289,6 +289,7 @@ namespace CryptoExchange.Net.OrderBook
             if (!startResult.Success)
             {
                 Status = OrderBookStatus.Disconnected;
+                _queueEvent.Set();
                 return CallResult.Fail(startResult.Error!);
             }
 

CryptoExchange.Net/Sockets/Default/Routing/MessageRouter.cs

@@ -25,6 +25,9 @@ namespace CryptoExchange.Net.Sockets.Default.Routing
             Routes = routes;
         }
 
+        private RouteCollection? GetRoutes(string typeIdentifier)
+            => (_routingTable ?? throw new NullReferenceException("Routing table not build before handling")).GetRoutes(typeIdentifier);
+
         /// <summary>
         /// Build the route mapping
         /// </summary>
@@ -46,13 +49,21 @@ namespace CryptoExchange.Net.Sockets.Default.Routing
         /// </summary>
         public bool Handle(string typeIdentifier, string? topicFilter, SocketConnection connection, DateTime receiveTime, string? originalData, object data, out CallResult? result)
         {
-            var routeCollection = (_routingTable ?? throw new NullReferenceException("Routing table not build before handling")).GetRoutes(typeIdentifier);
+            var routeCollection = GetRoutes(typeIdentifier);
             if (routeCollection == null)
                 throw new InvalidOperationException($"No routes for {typeIdentifier} message type");
 
             return routeCollection.Handle(topicFilter, connection, receiveTime, originalData, data, out result);
         }
 
+        /// <summary>
+        /// Whether the router has a matching route for the specified message type and topic
+        /// </summary>
+        public bool CanHandle(string typeIdentifier, string? topicFilter)
+        {
+            return GetRoutes(typeIdentifier)?.CanHandle(topicFilter) == true;
+        }
+
         /// <summary>
         /// Create a void handler
         /// </summary>

CryptoExchange.Net/Sockets/Default/Routing/RouteCollection.cs

@@ -60,6 +60,15 @@ namespace CryptoExchange.Net.Sockets.Default.Routing
             return matchingTopicRoutes;
         }
 
+        public bool CanHandle(string? topicFilter)
+        {
+            if (_routesWithoutTopicFilter.Count > 0)
+                return true;
+
+            return topicFilter != null
+                && GetRoutesWithMatchingTopicFilter(topicFilter) != null;
+        }
+
         public abstract bool Handle(string? topicFilter, SocketConnection connection, DateTime receiveTime, string? originalData, object data, out CallResult? result);
     }
 }

CryptoExchange.Net/Sockets/Default/Subscription.cs

@@ -219,9 +219,13 @@ namespace CryptoExchange.Net.Sockets.Default
             ConnectionInvocations++;
             TotalInvocations++;
 
-            if (SubscriptionQuery != null && !SubscriptionQuery.Completed && SubscriptionQuery.TimeoutBehavior == TimeoutBehavior.Succeed)
+            if (SubscriptionQuery != null
+                && !SubscriptionQuery.Completed
+                && SubscriptionQuery.TimeoutBehavior == TimeoutBehavior.Succeed
+                && MessageRouter.CanHandle(typeIdentifier, topicFilter))
             {
                 // The subscription query is one where it is successful if there is no error returned
+                // The connection routes by type, so only a matching subscription route proves the query was successful
                 // Since we've received a data update for the subscription we can assume the subscribe query was successful
                 // Call timeout to complete 
                 SubscriptionQuery.Timeout();

CryptoExchange.Net/Trackers/Klines/KlineTracker.cs

@@ -282,8 +282,8 @@ namespace CryptoExchange.Net.Trackers.Klines
                 KlineCount = klines.Count(),
                 FirstOpenTime = klines.First().OpenTime,
                 LastOpenTime = klines.Last().OpenTime,
-                HighPrice = klines.Select(d => d.LowPrice).Max(),
+                HighPrice = klines.Select(d => d.HighPrice).Max(),
-                LowPrice = klines.Select(d => d.HighPrice).Min(),
+                LowPrice = klines.Select(d => d.LowPrice).Min(),
 #pragma warning disable CS0618 // Type or member is obsolete | Temporary to maintain previous behavior
                 Volume = klines.Select(d => d.Volume).Sum(),
                 AverageVolume = Math.Round(klines.OrderByDescending(d => d.OpenTime).Skip(1).Select(d => d.Volume).DefaultIfEmpty().Average(), 8)

Examples/BlazorClient/BlazorClient.csproj

@@ -5,36 +5,37 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Binance.Net" Version="13.3.0" />
+    <PackageReference Include="Binance.Net" Version="13.5.0" />
-    <PackageReference Include="Bitfinex.Net" Version="11.3.0" />
+    <PackageReference Include="Bitfinex.Net" Version="11.4.0" />
-    <PackageReference Include="BitMart.Net" Version="4.3.0" />
+    <PackageReference Include="BitMart.Net" Version="4.4.0" />
-    <PackageReference Include="BloFin.Net" Version="3.3.0" />
+    <PackageReference Include="BloFin.Net" Version="3.4.0" />
-    <PackageReference Include="Bybit.Net" Version="7.3.0" />
+    <PackageReference Include="Bybit.Net" Version="7.5.0" />
-    <PackageReference Include="CoinEx.Net" Version="11.3.0" />
+    <PackageReference Include="CoinEx.Net" Version="11.4.0" />
-    <PackageReference Include="CoinW.Net" Version="3.3.0" />
+    <PackageReference Include="CoinW.Net" Version="3.4.0" />
-    <PackageReference Include="CryptoCom.Net" Version="4.3.0" />
+    <PackageReference Include="CryptoCom.Net" Version="4.4.0" />
-    <PackageReference Include="DeepCoin.Net" Version="4.3.0" />
+    <PackageReference Include="DeepCoin.Net" Version="4.4.0" />
-    <PackageReference Include="GateIo.Net" Version="4.4.0" />
+    <PackageReference Include="GateIo.Net" Version="4.6.0" />
-    <PackageReference Include="HyperLiquid.Net" Version="5.4.0" />
+    <PackageReference Include="HyperLiquid.Net" Version="5.7.0" />
-    <PackageReference Include="JK.BingX.Net" Version="4.3.0" />
+    <PackageReference Include="JK.BingX.Net" Version="4.5.0" />
-    <PackageReference Include="JK.Bitget.Net" Version="4.3.2" />
+    <PackageReference Include="JK.Bitget.Net" Version="4.5.0" />
-    <PackageReference Include="JK.Mexc.Net" Version="6.4.0" />
+    <PackageReference Include="JK.Mexc.Net" Version="6.6.0" />
-    <PackageReference Include="JK.OKX.Net" Version="5.3.1" />
+    <PackageReference Include="JK.OKX.Net" Version="5.4.0" />
-    <PackageReference Include="Jkorf.Aster.Net" Version="4.3.0" />
+    <PackageReference Include="Jkorf.Aster.Net" Version="4.4.0" />
-    <PackageReference Include="JKorf.BitMEX.Net" Version="4.3.0" />
+    <PackageReference Include="JKorf.BitMEX.Net" Version="4.4.0" />
-    <PackageReference Include="JKorf.Coinbase.Net" Version="4.4.0" />
+    <PackageReference Include="JKorf.Coinbase.Net" Version="4.5.0" />
-    <PackageReference Include="JKorf.HTX.Net" Version="9.3.0" />
+    <PackageReference Include="JKorf.HTX.Net" Version="9.5.0" />
-    <PackageReference Include="JKorf.Lighter.Net" Version="1.4.0" />
+    <PackageReference Include="JKorf.Lighter.Net" Version="1.5.0" />
-    <PackageReference Include="JKorf.Upbit.Net" Version="3.3.0" />
+    <PackageReference Include="JKorf.Upbit.Net" Version="3.4.0" />
-    <PackageReference Include="KrakenExchange.Net" Version="8.3.0" />
+    <PackageReference Include="KrakenExchange.Net" Version="8.4.0" />
-    <PackageReference Include="Kucoin.Net" Version="9.3.0" />
+    <PackageReference Include="Kucoin.Net" Version="9.5.0" />
-    <PackageReference Include="LBank.Net" Version="1.0.0" />
+    <PackageReference Include="LBank.Net" Version="1.1.0" />
-    <PackageReference Include="Pionex.Net" Version="1.1.0" />
+    <PackageReference Include="Pionex.Net" Version="1.2.0" />
     <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
-    <PackageReference Include="Toobit.Net" Version="4.3.0" />
+    <PackageReference Include="Tapbit.Net" Version="1.0.0" />
-    <PackageReference Include="Weex.Net" Version="2.3.0" />
+    <PackageReference Include="Toobit.Net" Version="4.4.0" />
-    <PackageReference Include="WhiteBit.Net" Version="4.3.0" />
+    <PackageReference Include="Weex.Net" Version="2.4.0" />
-    <PackageReference Include="XT.Net" Version="4.3.0" />
+    <PackageReference Include="WhiteBit.Net" Version="4.4.0" />
+    <PackageReference Include="XT.Net" Version="4.5.0" />
   </ItemGroup>
 
 </Project>

Examples/BlazorClient/Pages/Index.razor

@@ -23,6 +23,7 @@
 @inject IMexcRestClient mexcClient
 @inject IOKXRestClient okxClient
 @inject IPionexRestClient pionexClient
+@inject ITapbitRestClient tapbitClient
 @inject IToobitRestClient toobitClient
 @inject IUpbitRestClient upbitClient
 @inject IWeexRestClient weexClient
@@ -70,7 +71,8 @@
         var whitebitTask = whitebitClient.V4Api.ExchangeData.GetTickersAsync();
         var xtTask = xtClient.SpotApi.ExchangeData.GetTickersAsync("btc_usdt");
 
-        await Task.WhenAll(asterTask, binanceTask, bingXTask, bitfinexTask, bitgetTask, bitmartTask, bloFinTask, bitmexTask, bybitTask, coinexTask, coinWTask, deepCoinTask, gateioTask, htxTask, krakenTask, kucoinTask, lBankTask, mexcTask, okxTask, pionexTask);
+        await Task.WhenAll(asterTask, binanceTask, bingXTask, bitfinexTask, bitgetTask, bitmartTask, bloFinTask, bitmexTask, bybitTask, coinexTask, coinWTask, deepCoinTask, gateioTask, 
+                           htxTask, krakenTask, kucoinTask, lBankTask, mexcTask, okxTask, pionexTask, toobitTask, upbitTask, weexTask, whitebitTask, xtTask);
 
         if (asterTask.Result.Success)
             _prices.Add("Aster", asterTask.Result.Data.LastPrice);

Examples/BlazorClient/Startup.cs

@@ -57,6 +57,7 @@ namespace BlazorClient
             services.AddMexc();
             services.AddOKX();
             services.AddPionex();
+            services.AddTapbit();
             services.AddToobit();
             services.AddUpbit();
             services.AddWeex();

Examples/BlazorClient/_Imports.razor

@@ -33,6 +33,7 @@
 @using OKX.Net.Interfaces.Clients;
 @using Pionex.Net.Interfaces.Clients;
 @using Upbit.Net.Interfaces.Clients;
+@using Tapbit.Net.Interfaces.Clients;
 @using Toobit.Net.Interfaces.Clients;
 @using Weex.Net.Interfaces.Clients
 @using WhiteBit.Net.Interfaces.Clients

README.md

@@ -59,6 +59,7 @@ Full list of all libraries part of the CryptoExchange.Net ecosystem. Consider us
 |![OKX](https://raw.githubusercontent.com/JKorf/OKX.Net/refs/heads/main/OKX.Net/Icon/icon.png)|OKX|CEX|[JKorf/OKX.Net](https://github.com/JKorf/OKX.Net)|[![Nuget version](https://img.shields.io/nuget/v/JK.OKX.net.svg?style=flat-square)](https://www.nuget.org/packages/JK.OKX.Net)|[Link](https://www.okx.com/join/14592495)|20%|
 |![Pionex](https://raw.githubusercontent.com/JKorf/Pionex.Net/refs/heads/main/Pionex.Net/Icon/icon.png)|Pionex|CEX|[JKorf/Pionex.Net](https://github.com/JKorf/Pionex.Net)|[![Nuget version](https://img.shields.io/nuget/v/Pionex.net.svg?style=flat-square)](https://www.nuget.org/packages/Pionex.Net)|-|-|
 |![Polymarket](https://raw.githubusercontent.com/JKorf/Polymarket.Net/main/Polymarket.Net/Icon/icon.png)|Polymarket|DEX|[JKorf/Polymarket.Net](https://github.com/JKorf/Polymarket.Net)|[![Nuget version](https://img.shields.io/nuget/v/Polymarket.net.svg?style=flat-square)](https://www.nuget.org/packages/Polymarket.Net)|-|-|
+|![Tapbit](https://raw.githubusercontent.com/JKorf/Tapbit.Net/refs/heads/main/Tapbit.Net/Icon/icon.png)|Tapbit|CEX|[JKorf/Tapbit.Net](https://github.com/JKorf/Tapbit.Net)|[![Nuget version](https://img.shields.io/nuget/v/Tapbit.net.svg?style=flat-square)](https://www.nuget.org/packages/Tapbit.Net)|[Link](https://www.tapbit.com/en/invite/SPBGMSK)|-|
 |![Toobit](https://raw.githubusercontent.com/JKorf/Toobit.Net/refs/heads/main/Toobit.Net/Icon/icon.png)|Toobit|CEX|[JKorf/Toobit.Net](https://github.com/JKorf/Toobit.Net)|[![Nuget version](https://img.shields.io/nuget/v/Toobit.net.svg?style=flat-square)](https://www.nuget.org/packages/Toobit.Net)|[Link](https://www.toobit.com/en-US/register?invite_code=zsV19h)|-|
 |![Upbit](https://raw.githubusercontent.com/JKorf/Upbit.Net/refs/heads/main/Upbit.Net/Icon/icon.png)|Upbit|CEX|[JKorf/Upbit.Net](https://github.com/JKorf/Upbit.Net)|[![Nuget version](https://img.shields.io/nuget/v/JKorf.Upbit.net.svg?style=flat-square)](https://www.nuget.org/packages/JKorf.Upbit.Net)|-|-|
 |![Weex](https://raw.githubusercontent.com/JKorf/Weex.Net/refs/heads/main/Weex.Net/Icon/icon.png)|Weex|CEX|[JKorf/Weex.Net](https://github.com/JKorf/Weex.Net)|[![Nuget version](https://img.shields.io/nuget/v/Weex.net.svg?style=flat-square)](https://www.nuget.org/packages/Weex.Net)|-|-|
@@ -127,6 +128,12 @@ Various:
   * PlatformInfo now required support environment names in the constructor
 
 ## Release notes
+* Version 12.5.1 - 01 Sep 2026
+    * Fixed KlineTracker reporting incorrect High/Low price on GetStats result
+    * Fixed caching issue for auth requests
+    * Fixed failed ISymbolOrderBook start potentially leaving a pending background task
+    * Fixed subscription query completion potentially reporting success too early for topic-filtered routes
+
 * Version 12.5.0 - 21 Aug 2026
     * Shared APIs
       * Added ISpotOrderManagementSocketClient for placing/canceling Spot orders via Shared websocket implementation

llms.txt

@@ -2,7 +2,7 @@
 
 > Base C#/.NET library for cryptocurrency exchange API client implementations. Provides a standardized abstraction (REST, WebSocket, authentication, rate limiting, error handling, order book management, shared cross-exchange interfaces) that 28+ exchange-specific libraries are built on top of.
 
-CryptoExchange.Net itself is not used directly — install one of the exchange-specific libraries (Binance.Net, Bybit.Net, OKX.Net, Kraken.Net, Coinbase.Net, etc.) or `CryptoClients.Net` to access all exchanges via a single bundle. The base library is what makes the entire ecosystem feel consistent: same `HttpResult<T>` REST result pattern, same `WebSocketResult<UpdateSubscription>` websocket subscription pattern, same DI registration, same shared interfaces across all exchanges. Current version: 12.5.0. Targets netstandard2.0, netstandard2.1, net8.0, net9.0, net10.0. Native AOT supported.
+CryptoExchange.Net itself is not used directly — install one of the exchange-specific libraries (Binance.Net, Bybit.Net, OKX.Net, Kraken.Net, Coinbase.Net, etc.) or `CryptoClients.Net` to access all exchanges via a single bundle. The base library is what makes the entire ecosystem feel consistent: same `HttpResult<T>` REST result pattern, same `WebSocketResult<UpdateSubscription>` websocket subscription pattern, same DI registration, same shared interfaces across all exchanges. Current version: 12.5.1. Targets netstandard2.0, netstandard2.1, net8.0, net9.0, net10.0. Native AOT supported.
 
 The standout feature for cross-exchange code is `CryptoExchange.Net.SharedApis` — a set of interfaces (`ISpotTickerRestClient`, `ISpotOrderRestClient`, `IBalanceRestClient`, etc.) implemented by every exchange library. Same call signature works against any exchange.