diff --git a/Framework/Utils/RollingAverage.cs b/Framework/Utils/RollingAverage.cs
new file mode 100644
index 00000000..56746845
--- /dev/null
+++ b/Framework/Utils/RollingAverage.cs
@@ -0,0 +1,21 @@
+namespace Utils
+{
+    public static class RollingAverage
+    {
+        /// <param name="currentAverage">Value of average before new value is added.</param>
+        /// <param name="newNumberOfValues">Number of values in average after new value is added.</param>
+        /// <param name="newValue">New value to be added.</param>
+        /// <returns>New average value.</returns>
+        /// <exception cref="Exception">newNumberOfValues must be 1 or greater.</exception>
+        public static float GetNewAverage(float currentAverage, int newNumberOfValues, float newValue)
+        {
+            if (newNumberOfValues < 1) throw new Exception("Should be at least 1 value.");
+
+            float n = newNumberOfValues;
+            var originalValue = currentAverage;
+            var originalValueWeight = ((n - 1.0f) / n);
+            var newValueWeight = (1.0f / n);
+            return (originalValue * originalValueWeight) + (newValue * newValueWeight);
+        }
+    }
+}
diff --git a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainEvents.cs b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainEvents.cs
index 25d08513..aef39322 100644
--- a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainEvents.cs
+++ b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainEvents.cs
@@ -10,6 +10,7 @@ namespace CodexContractsPlugin.ChainMonitor
             Request[] requests,
             RequestFulfilledEventDTO[] fulfilled,
             RequestCancelledEventDTO[] cancelled,
+            RequestFailedEventDTO[] failed,
             SlotFilledEventDTO[] slotFilled,
             SlotFreedEventDTO[] slotFreed
             )
@@ -18,6 +19,7 @@ namespace CodexContractsPlugin.ChainMonitor
             Requests = requests;
             Fulfilled = fulfilled;
             Cancelled = cancelled;
+            Failed = failed;
             SlotFilled = slotFilled;
             SlotFreed = slotFreed;
         }
@@ -26,6 +28,7 @@ namespace CodexContractsPlugin.ChainMonitor
         public Request[] Requests { get; }
         public RequestFulfilledEventDTO[] Fulfilled { get; }
         public RequestCancelledEventDTO[] Cancelled { get; }
+        public RequestFailedEventDTO[] Failed { get; }
         public SlotFilledEventDTO[] SlotFilled { get; }
         public SlotFreedEventDTO[] SlotFreed { get; }
 
@@ -37,6 +40,7 @@ namespace CodexContractsPlugin.ChainMonitor
                 all.AddRange(Requests);
                 all.AddRange(Fulfilled);
                 all.AddRange(Cancelled);
+                all.AddRange(Failed);
                 all.AddRange(SlotFilled);
                 all.AddRange(SlotFreed);
                 return all.ToArray();
@@ -60,6 +64,7 @@ namespace CodexContractsPlugin.ChainMonitor
                 events.GetStorageRequests(),
                 events.GetRequestFulfilledEvents(),
                 events.GetRequestCancelledEvents(),
+                events.GetRequestFailedEvents(),
                 events.GetSlotFilledEvents(),
                 events.GetSlotFreedEvents()
             );
diff --git a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainState.cs b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainState.cs
index 23ac7dc5..fba622bf 100644
--- a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainState.cs
+++ b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainState.cs
@@ -13,6 +13,7 @@ namespace CodexContractsPlugin.ChainMonitor
         void OnRequestFinished(RequestEvent requestEvent);
         void OnRequestFulfilled(RequestEvent requestEvent);
         void OnRequestCancelled(RequestEvent requestEvent);
+        void OnRequestFailed(RequestEvent requestEvent);
         void OnSlotFilled(RequestEvent requestEvent, EthAddress host, BigInteger slotIndex);
         void OnSlotFreed(RequestEvent requestEvent, BigInteger slotIndex);
     }
@@ -41,15 +42,12 @@ namespace CodexContractsPlugin.ChainMonitor
             this.log = new LogPrefixer(log, "(ChainState) ");
             this.contracts = contracts;
             handler = changeHandler;
-            StartUtc = startUtc;
             TotalSpan = new TimeRange(startUtc, startUtc);
         }
 
         public TimeRange TotalSpan { get; private set; }
         public IChainStateRequest[] Requests => requests.ToArray();
 
-        public DateTime StartUtc { get; }
-
         public void Update()
         {
             Update(DateTime.UtcNow);
@@ -124,6 +122,14 @@ namespace CodexContractsPlugin.ChainMonitor
             handler.OnRequestCancelled(new RequestEvent(@event.Block, r));
         }
 
+        private void ApplyEvent(RequestFailedEventDTO @event)
+        {
+            var r = FindRequest(@event.RequestId);
+            if (r == null) return;
+            r.UpdateState(@event.Block.BlockNumber, RequestState.Failed);
+            handler.OnRequestFailed(new RequestEvent(@event.Block, r));
+        }
+
         private void ApplyEvent(SlotFilledEventDTO @event)
         {
             var r = FindRequest(@event.RequestId);
diff --git a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainStateChangeHandlerMux.cs b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainStateChangeHandlerMux.cs
new file mode 100644
index 00000000..36ae46e4
--- /dev/null
+++ b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/ChainStateChangeHandlerMux.cs
@@ -0,0 +1,55 @@
+using GethPlugin;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CodexContractsPlugin.ChainMonitor
+{
+    public class ChainStateChangeHandlerMux : IChainStateChangeHandler
+    {
+        public ChainStateChangeHandlerMux(params IChainStateChangeHandler[] handlers)
+        {
+            Handlers = handlers.ToList();
+        }
+
+        public List<IChainStateChangeHandler> Handlers { get; } = new List<IChainStateChangeHandler>();
+
+        public void OnNewRequest(RequestEvent requestEvent)
+        {
+            foreach (var handler in Handlers) handler.OnNewRequest(requestEvent);
+        }
+
+        public void OnRequestCancelled(RequestEvent requestEvent)
+        {
+            foreach (var handler in Handlers) handler.OnRequestCancelled(requestEvent);
+        }
+
+        public void OnRequestFailed(RequestEvent requestEvent)
+        {
+            foreach (var handler in Handlers) handler.OnRequestFailed(requestEvent);
+        }
+
+        public void OnRequestFinished(RequestEvent requestEvent)
+        {
+            foreach (var handler in Handlers) handler.OnRequestFinished(requestEvent);
+        }
+
+        public void OnRequestFulfilled(RequestEvent requestEvent)
+        {
+            foreach (var handler in Handlers) handler.OnRequestFulfilled(requestEvent);
+        }
+
+        public void OnSlotFilled(RequestEvent requestEvent, EthAddress host, BigInteger slotIndex)
+        {
+            foreach (var handler in Handlers) handler.OnSlotFilled(requestEvent, host, slotIndex);
+        }
+
+        public void OnSlotFreed(RequestEvent requestEvent, BigInteger slotIndex)
+        {
+            foreach (var handler in Handlers) handler.OnSlotFreed(requestEvent, slotIndex);
+        }
+    }
+}
diff --git a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/DoNothingChainEventHandler.cs b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/DoNothingChainEventHandler.cs
index c564ec8a..812cfd61 100644
--- a/ProjectPlugins/CodexContractsPlugin/ChainMonitor/DoNothingChainEventHandler.cs
+++ b/ProjectPlugins/CodexContractsPlugin/ChainMonitor/DoNothingChainEventHandler.cs
@@ -13,6 +13,10 @@ namespace CodexContractsPlugin.ChainMonitor
         {
         }
 
+        public void OnRequestFailed(RequestEvent requestEvent)
+        {
+        }
+
         public void OnRequestFinished(RequestEvent requestEvent)
         {
         }
diff --git a/ProjectPlugins/CodexContractsPlugin/CodexContractsEvents.cs b/ProjectPlugins/CodexContractsPlugin/CodexContractsEvents.cs
index cf7b2d74..57a53712 100644
--- a/ProjectPlugins/CodexContractsPlugin/CodexContractsEvents.cs
+++ b/ProjectPlugins/CodexContractsPlugin/CodexContractsEvents.cs
@@ -13,6 +13,7 @@ namespace CodexContractsPlugin
         Request[] GetStorageRequests();
         RequestFulfilledEventDTO[] GetRequestFulfilledEvents();
         RequestCancelledEventDTO[] GetRequestCancelledEvents();
+        RequestFailedEventDTO[] GetRequestFailedEvents();
         SlotFilledEventDTO[] GetSlotFilledEvents();
         SlotFreedEventDTO[] GetSlotFreedEvents();
     }
@@ -71,6 +72,17 @@ namespace CodexContractsPlugin
             }).ToArray();
         }
 
+        public RequestFailedEventDTO[] GetRequestFailedEvents()
+        {
+            var events = gethNode.GetEvents<RequestFailedEventDTO>(deployment.MarketplaceAddress, BlockInterval);
+            return events.Select(e =>
+            {
+                var result = e.Event;
+                result.Block = GetBlock(e.Log.BlockNumber.ToUlong());
+                return result;
+            }).ToArray();
+        }
+
         public SlotFilledEventDTO[] GetSlotFilledEvents()
         {
             var events = gethNode.GetEvents<SlotFilledEventDTO>(deployment.MarketplaceAddress, BlockInterval);
diff --git a/ProjectPlugins/CodexContractsPlugin/Marketplace/Customizations.cs b/ProjectPlugins/CodexContractsPlugin/Marketplace/Customizations.cs
index 43311430..d842a9e3 100644
--- a/ProjectPlugins/CodexContractsPlugin/Marketplace/Customizations.cs
+++ b/ProjectPlugins/CodexContractsPlugin/Marketplace/Customizations.cs
@@ -40,6 +40,12 @@ namespace CodexContractsPlugin.Marketplace
         public BlockTimeEntry Block { get; set; }
     }
 
+    public partial class RequestFailedEventDTO : IHasBlock
+    {
+        [JsonIgnore]
+        public BlockTimeEntry Block { get; set; }
+    }
+
     public partial class SlotFilledEventDTO : IHasBlock
     {
         [JsonIgnore]
diff --git a/Tests/FrameworkTests/Utils/TimeTests.cs b/Tests/FrameworkTests/Utils/TimeTests.cs
index 207b3388..20945284 100644
--- a/Tests/FrameworkTests/Utils/TimeTests.cs
+++ b/Tests/FrameworkTests/Utils/TimeTests.cs
@@ -21,5 +21,16 @@ namespace FrameworkTests.Utils
                 TimeSpan.FromSeconds(28)
             ));
         }
+
+        [Test]
+        public void Averaging()
+        {
+            var first = RollingAverage.GetNewAverage(0.0f, 1, 1.0f);
+            Assert.That(first, Is.EqualTo(1.0f));
+
+            var fifth = RollingAverage.GetNewAverage(5.0f, 5, 0.0f);
+            var expected = new[] { 5.0f, 5.0f, 5.0f, 5.0f, 0.0f }.Average();
+            Assert.That(fifth, Is.EqualTo(expected));
+        }
     }
 }
diff --git a/Tools/MarketInsights/AppState.cs b/Tools/MarketInsights/AppState.cs
new file mode 100644
index 00000000..8a49f25c
--- /dev/null
+++ b/Tools/MarketInsights/AppState.cs
@@ -0,0 +1,13 @@
+namespace MarketInsights
+{
+    public class AppState
+    {
+        public AppState(Configuration config)
+        {
+            Config = config;
+        }
+
+        public MarketOverview MarketOverview { get; set; } = new ();
+        public Configuration Config { get; }
+    }
+}
diff --git a/Tools/MarketInsights/AverageHistory.cs b/Tools/MarketInsights/AverageHistory.cs
new file mode 100644
index 00000000..d0b43505
--- /dev/null
+++ b/Tools/MarketInsights/AverageHistory.cs
@@ -0,0 +1,71 @@
+using CodexContractsPlugin.ChainMonitor;
+using GethPlugin;
+using System.Numerics;
+using Utils;
+
+namespace MarketInsights
+{
+    public class AverageHistory
+    {
+        public readonly List<MarketTimeSegment> contributions = new List<MarketTimeSegment>();
+
+    }
+
+    public class ContributionBuilder : IChainStateChangeHandler
+    {
+        private readonly MarketTimeSegment segment = new MarketTimeSegment();
+
+        public void OnNewRequest(RequestEvent requestEvent)
+        {
+            AddRequestToAverage(segment.Submitted, requestEvent);
+        }
+
+        public void OnRequestCancelled(RequestEvent requestEvent)
+        {
+            AddRequestToAverage(segment.Expired, requestEvent);
+        }
+
+        public void OnRequestFailed(RequestEvent requestEvent)
+        {
+            AddRequestToAverage(segment.Failed, requestEvent);
+        }
+
+        public void OnRequestFinished(RequestEvent requestEvent)
+        {
+            AddRequestToAverage(segment.Finished, requestEvent);
+        }
+
+        public void OnRequestFulfilled(RequestEvent requestEvent)
+        {
+            AddRequestToAverage(segment.Started, requestEvent);
+        }
+
+        public void OnSlotFilled(RequestEvent requestEvent, EthAddress host, BigInteger slotIndex)
+        {
+        }
+
+        public void OnSlotFreed(RequestEvent requestEvent, BigInteger slotIndex)
+        {
+        }
+
+        private void AddRequestToAverage(ContractAverages average, RequestEvent requestEvent)
+        {
+            average.Number++;
+            average.Price = GetNewAverage(average.Price, average.Number, requestEvent.Request.Request.Ask.Reward);
+            average.Size = GetNewAverage(average.Size, average.Number, requestEvent.Request.Request.Ask.SlotSize);
+            average.Duration = GetNewAverage(average.Duration, average.Number, requestEvent.Request.Request.Ask.Duration);
+            average.Collateral = GetNewAverage(average.Collateral, average.Number, requestEvent.Request.Request.Ask.Collateral);
+            average.ProofProbability = GetNewAverage(average.ProofProbability, average.Number, requestEvent.Request.Request.Ask.ProofProbability);
+        }
+
+        private float GetNewAverage(float currentAverage, int newNumberOfValues, BigInteger newValue)
+        {
+            return GetNewAverage(currentAverage, newNumberOfValues, (float)newValue);
+        }
+
+        private float GetNewAverage(float currentAverage, int newNumberOfValues, float newValue)
+        {
+            return RollingAverage.GetNewAverage(currentAverage, newNumberOfValues, newValue);
+        }
+    }
+}
diff --git a/Tools/MarketInsights/Configuration.cs b/Tools/MarketInsights/Configuration.cs
new file mode 100644
index 00000000..f8fa5743
--- /dev/null
+++ b/Tools/MarketInsights/Configuration.cs
@@ -0,0 +1,37 @@
+using ArgsUniform;
+
+namespace MarketInsights
+{
+    public class Configuration
+    {
+        [Uniform("interval-minutes", "im", "INTERVALMINUTES", true, "time in minutes between updates.")]
+        public int UpdateIntervalMinutes { get; set; } = 10;
+
+        [Uniform("max-random-seconds", "mrs", "MAXRANDOMSECONDS", false, "maximum random number of seconds added to update delay.")]
+        public int MaxRandomIntervalSeconds { get; set; } = 120;
+
+        [Uniform("check-history", "ch", "CHECKHISTORY", true, "Unix epoc timestamp of a moment in history on which processing begins. Should be 'launch of the testnet'.")]
+        public int CheckHistoryTimestamp { get; set; } = 0;
+
+        /// <summary>
+        /// 6 = 1h
+        /// 144 = 24h
+        /// 2520 = 1 week
+        /// 10080 = 4 weeks
+        /// </summary>
+        [Uniform("timesegments", "ts", "TIMESEGMENTS", false, "Semi-colon separated integers. Each represents a multiple of intervals, for which a market timesegment will be generated.")]
+        public string TimeSegments { get; set; } = "6;144;2520;10080";
+
+        [Uniform("fullhistory", "fh", "FULLHISTORY", false, "When not zero, market timesegment for 'entire history' will be included.")]
+        public int FullHistory { get; set; } = 1;
+
+        public DateTime HistoryStartUtc
+        {
+            get
+            {
+                if (CheckHistoryTimestamp == 0) throw new Exception("'check-history' unix timestamp is required. Set it to the start/launch moment of the testnet.");
+                return DateTimeOffset.FromUnixTimeSeconds(CheckHistoryTimestamp).UtcDateTime;
+            }
+        }
+    }
+}
diff --git a/Tools/MarketInsights/Controllers/MarketController.cs b/Tools/MarketInsights/Controllers/MarketController.cs
index 9a6b5a83..2ca608ce 100644
--- a/Tools/MarketInsights/Controllers/MarketController.cs
+++ b/Tools/MarketInsights/Controllers/MarketController.cs
@@ -6,13 +6,20 @@ namespace MarketInsights.Controllers
     [Route("[controller]")]
     public class MarketController : ControllerBase
     {
+        private readonly AppState appState;
+
+        public MarketController(AppState appState)
+        {
+            this.appState = appState;
+        }
+
         /// <summary>
         /// Gets the most recent market overview.
         /// </summary>
         [HttpGet]
         public MarketOverview Get()
         {
-            return new MarketOverview();
+            return appState.MarketOverview;
         }
     }
 }
diff --git a/Tools/MarketInsights/MarketInsights.csproj b/Tools/MarketInsights/MarketInsights.csproj
index b1d65bda..08ec3d7a 100644
--- a/Tools/MarketInsights/MarketInsights.csproj
+++ b/Tools/MarketInsights/MarketInsights.csproj
@@ -16,4 +16,9 @@
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\..\Framework\ArgsUniform\ArgsUniform.csproj" />
+    <ProjectReference Include="..\..\ProjectPlugins\CodexContractsPlugin\CodexContractsPlugin.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/Tools/MarketInsights/Model.cs b/Tools/MarketInsights/Model.cs
index 8d44c3c5..06057cab 100644
--- a/Tools/MarketInsights/Model.cs
+++ b/Tools/MarketInsights/Model.cs
@@ -2,6 +2,11 @@
 {
     public class MarketOverview
     {
+        /// <summary>
+        /// Moment when overview was last updated.
+        /// </summary>
+        public DateTime LastUpdatedUtc { get; set; }
+
         public MarketTimeSegment[] TimeSegments { get; set; } = Array.Empty<MarketTimeSegment>();
     }
 
diff --git a/Tools/MarketInsights/Program.cs b/Tools/MarketInsights/Program.cs
index 760705a3..07f58534 100644
--- a/Tools/MarketInsights/Program.cs
+++ b/Tools/MarketInsights/Program.cs
@@ -1,4 +1,4 @@
-
+using ArgsUniform;
 using Microsoft.Extensions.Options;
 using System.Reflection;
 
@@ -8,9 +8,15 @@ namespace MarketInsights
     {
         public static void Main(string[] args)
         {
+            var uniformArgs = new ArgsUniform<Configuration>(PrintHelp, args);
+            var config = uniformArgs.Parse(true);
+
+            var appState = new AppState(config);
+            var updater = new Updater(appState);
+
             var builder = WebApplication.CreateBuilder(args);
 
-            // Add services to the container.
+            builder.Services.AddSingleton(appState);
 
             builder.Services.AddControllers();
             // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
@@ -34,10 +40,15 @@ namespace MarketInsights
 
             app.UseAuthorization();
 
-
             app.MapControllers();
 
+            updater.Run();
             app.Run();
         }
+
+        private static void PrintHelp()
+        {
+            Console.WriteLine("WebAPI for generating market overview for Codex network. Comes with OpenAPI swagger endpoint.");
+        }
     }
 }
diff --git a/Tools/MarketInsights/Updater.cs b/Tools/MarketInsights/Updater.cs
new file mode 100644
index 00000000..11419c9c
--- /dev/null
+++ b/Tools/MarketInsights/Updater.cs
@@ -0,0 +1,35 @@
+
+namespace MarketInsights
+{
+    public class Updater
+    {
+        private readonly AppState appState;
+        private readonly Tracker[] trackers;
+
+        public Updater(AppState appState)
+        {
+            this.appState = appState;
+            trackers = CreateTrackers();
+        }
+
+        private Tracker[] CreateTrackers()
+        {
+            var tokens = appState.Config.TimeSegments.Split(";", StringSplitOptions.RemoveEmptyEntries);
+            var nums = tokens.Select(t => Convert.ToInt32(t)).ToArray();
+            return nums.Select(n => new Tracker(n)).ToArray();
+        }
+
+        public void Run()
+        {
+
+        }
+    }
+
+    public class Tracker
+    {
+        public Tracker(int numberOfSegments)
+        {
+            
+        }
+    }
+}
diff --git a/Tools/TestNetRewarder/ChainChangeMux.cs b/Tools/TestNetRewarder/ChainChangeMux.cs
deleted file mode 100644
index f906a20f..00000000
--- a/Tools/TestNetRewarder/ChainChangeMux.cs
+++ /dev/null
@@ -1,46 +0,0 @@
-using CodexContractsPlugin.ChainMonitor;
-using GethPlugin;
-using System.Numerics;
-
-namespace TestNetRewarder
-{
-    public class ChainChangeMux : IChainStateChangeHandler
-    {
-        private readonly IChainStateChangeHandler[] handlers;
-
-        public ChainChangeMux(params IChainStateChangeHandler[] handlers)
-        {
-            this.handlers = handlers;
-        }
-
-        public void OnNewRequest(RequestEvent requestEvent)
-        {
-            foreach (var handler in handlers) handler.OnNewRequest(requestEvent);
-        }
-
-        public void OnRequestCancelled(RequestEvent requestEvent)
-        {
-            foreach (var handler in handlers) handler.OnRequestCancelled(requestEvent);
-        }
-
-        public void OnRequestFinished(RequestEvent requestEvent)
-        {
-            foreach (var handler in handlers) handler.OnRequestFinished(requestEvent);
-        }
-
-        public void OnRequestFulfilled(RequestEvent requestEvent)
-        {
-            foreach (var handler in handlers) handler.OnRequestFulfilled(requestEvent);
-        }
-
-        public void OnSlotFilled(RequestEvent requestEvent, EthAddress host, BigInteger slotIndex)
-        {
-            foreach (var handler in handlers) handler.OnSlotFilled(requestEvent, host, slotIndex);
-        }
-
-        public void OnSlotFreed(RequestEvent requestEvent, BigInteger slotIndex)
-        {
-            foreach (var handler in handlers) handler.OnSlotFreed(requestEvent, slotIndex);
-        }
-    }
-}
diff --git a/Tools/TestNetRewarder/EventsFormatter.cs b/Tools/TestNetRewarder/EventsFormatter.cs
index 048a3a55..1029eb79 100644
--- a/Tools/TestNetRewarder/EventsFormatter.cs
+++ b/Tools/TestNetRewarder/EventsFormatter.cs
@@ -44,6 +44,11 @@ namespace TestNetRewarder
             AddRequestBlock(requestEvent, "Cancelled");
         }
 
+        public void OnRequestFailed(RequestEvent requestEvent)
+        {
+            AddRequestBlock(requestEvent, "Failed");
+        }
+
         public void OnRequestFinished(RequestEvent requestEvent)
         {
             AddRequestBlock(requestEvent, "Finished");
diff --git a/Tools/TestNetRewarder/MarketTracker.cs b/Tools/TestNetRewarder/MarketTracker.cs
index 981c51c5..2c0be483 100644
--- a/Tools/TestNetRewarder/MarketTracker.cs
+++ b/Tools/TestNetRewarder/MarketTracker.cs
@@ -70,5 +70,10 @@ namespace TestNetRewarder
             }
             return Array.Empty<int>();
         }
+
+        public void OnRequestFailed(RequestEvent requestEvent)
+        {
+            throw new NotImplementedException("being removed");
+        }
     }
 }
diff --git a/Tools/TestNetRewarder/Processor.cs b/Tools/TestNetRewarder/Processor.cs
index 642be072..1572335f 100644
--- a/Tools/TestNetRewarder/Processor.cs
+++ b/Tools/TestNetRewarder/Processor.cs
@@ -25,7 +25,7 @@ namespace TestNetRewarder
             marketTracker = new MarketTracker(config, log);
             eventsFormatter = new EventsFormatter();
 
-            var handler = new ChainChangeMux(
+            var handler = new ChainStateChangeHandlerMux(
                 rewardChecker.Handler,
                 marketTracker,
                 eventsFormatter
diff --git a/Tools/TestNetRewarder/RewardCheck.cs b/Tools/TestNetRewarder/RewardCheck.cs
index c01e0835..dc933231 100644
--- a/Tools/TestNetRewarder/RewardCheck.cs
+++ b/Tools/TestNetRewarder/RewardCheck.cs
@@ -34,6 +34,10 @@ namespace TestNetRewarder
         {
         }
 
+        public void OnRequestFailed(RequestEvent requestEvent)
+        {
+        }
+
         public void OnRequestFinished(RequestEvent requestEvent)
         {
             if (MeetsRequirements(CheckType.HostFinishedSlot, requestEvent))
diff --git a/Tools/TestNetRewarder/RewardChecker.cs b/Tools/TestNetRewarder/RewardChecker.cs
index 0d22baf4..f8e500cc 100644
--- a/Tools/TestNetRewarder/RewardChecker.cs
+++ b/Tools/TestNetRewarder/RewardChecker.cs
@@ -9,7 +9,7 @@ namespace TestNetRewarder
         {
             var repo = new RewardRepo();
             var checks = repo.Rewards.Select(r => new RewardCheck(r, giver)).ToArray();
-            Handler = new ChainChangeMux(checks);
+            Handler = new ChainStateChangeHandlerMux(checks);
         }
 
         public IChainStateChangeHandler Handler { get; }