diff --git a/FeedlySharp/Endpoints/Markers.cs b/FeedlySharp/Endpoints/Markers.cs
new file mode 100644
index 0000000..797ed4d
--- /dev/null
+++ b/FeedlySharp/Endpoints/Markers.cs
@@ -0,0 +1,118 @@
+using FeedlySharp.Models;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Linq;
+using System.Dynamic;
+
+namespace FeedlySharp
+{
+  public partial class FeedlyClient
+  {
+    public async Task<List<FeedlyCategoryUnreadCount>> GetMarkersUnreadCount(bool isAutoRefresh = false, DateTime? newerThan = null, string categoryId = null, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      Dictionary<string, string> parameters = new Dictionary<string, string>();
+      if (isAutoRefresh)
+      {
+        parameters["autorefresh"] = "true";
+      }
+      if (newerThan.HasValue)
+      {
+        DateTime date = ((DateTime)newerThan.Value).ToUniversalTime();
+        DateTime epoc = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        parameters["newerThan"] = Math.Truncate(date.Subtract(epoc).TotalMilliseconds).ToString();
+      }
+      if (!String.IsNullOrEmpty(categoryId))
+      {
+        parameters["streamId"] = ValueToResource("category", categoryId, false);
+      }
+      return (await Client.Request<CategoryUnreadCountResponse>(HttpMethod.Get, "v3/markers/counts", parameters, false, true, cancellationToken)).List;
+    }
+
+
+    public async Task<bool> MarkEntriesAsRead(string[] entryIds, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      await Client.Request(HttpMethod.Post, "v3/markers", new { action = "markAsRead", entryIds = entryIds, type = "entries" }, true, true, cancellationToken);
+      return true;
+    }
+
+    public async Task<bool> MarkEntryAsRead(string entryId, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await MarkEntriesAsRead(new string[] { entryId }, cancellationToken);
+    }
+
+
+    public async Task<bool> KeepEntriesAsUnread(string[] entryIds, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      await Client.Request(HttpMethod.Post, "v3/markers", new { action = "keepUnread", entryIds = entryIds, type = "entries" }, true, true, cancellationToken);
+      return true;
+    }
+
+    public async Task<bool> KeepEntryAsUnread(string entryId, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await KeepEntriesAsUnread(new string[] { entryId }, cancellationToken);
+    }
+
+
+    public async Task<bool> MarkFeedsAsRead(string[] feedIds, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      await Client.Request(HttpMethod.Post, "v3/markers", new { action = "markAsRead", feedIds = feedIds, type = "feeds" }, true, true, cancellationToken);
+      return true;
+    }
+
+    public async Task<bool> MarkFeedAsRead(string feedId, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await MarkFeedsAsRead(new string[] { feedId }, cancellationToken);
+    }
+
+
+    public async Task<bool> MarkCategoriesAsRead(string[] categoryIds, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      categoryIds = categoryIds.Select(x => ValueToResource("category", x, false)).ToArray();
+      await Client.Request(HttpMethod.Post, "v3/markers", new { action = "markAsRead", categoryIds = categoryIds, type = "categories" }, true, true, cancellationToken);
+      return true;
+    }
+
+    public async Task<bool> MarkCategoryAsRead(string categoryId, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await MarkCategoriesAsRead(new string[] { categoryId }, cancellationToken);
+    }
+
+
+    public async Task<bool> MarkEntriesAsSaved(string[] entryIds, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      await Client.Request(HttpMethod.Post, "v3/markers", new { action = "markAsSaved", categoryIds = entryIds, type = "entries" }, true, true, cancellationToken);
+      return true;
+    }
+
+    public async Task<bool> MarkEntryAsSaved(string entryId, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await MarkEntriesAsSaved(new string[] { entryId }, cancellationToken);
+    }
+
+
+    public async Task<bool> MarkEntriesAsUnsaved(string[] entryIds, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      await Client.Request(HttpMethod.Post, "v3/markers", new { action = "markAsUnsaved", categoryIds = entryIds, type = "entries" }, true, true, cancellationToken);
+      return true;
+    }
+
+    public async Task<bool> MarkEntryAsUnsaved(string entryId, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await MarkEntriesAsUnsaved(new string[] { entryId }, cancellationToken);
+    }
+
+
+    public async Task<FeedlyReadOperations> GetMarkersReadOperations(DateTime newerThan, CancellationToken cancellationToken = default(CancellationToken))
+    {
+      return await Client.Request<FeedlyReadOperations>(HttpMethod.Get, "v3/markers/reads", new Dictionary<string, string>()
+      {
+        { "newerThan",  Math.Truncate(newerThan.ToUniversalTime().Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds).ToString() }
+      }, false, true, cancellationToken);
+    }
+
+  }
+}
diff --git a/FeedlySharp/Extensions/UriExtensions.cs b/FeedlySharp/Extensions/UriExtensions.cs
index 8694697..d690504 100644
--- a/FeedlySharp/Extensions/UriExtensions.cs
+++ b/FeedlySharp/Extensions/UriExtensions.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Net;
+using System.Text;
 
 namespace FeedlySharp.Extensions
 {
@@ -23,5 +24,29 @@ namespace FeedlySharp.Extensions
 
       return output;
     }
+
+
+    internal static string ToQueryString(this IDictionary<string, string> dict)
+    {
+      if (dict.Count == 0) return string.Empty;
+
+      var buffer = new StringBuilder();
+      int count = 0;
+      bool end = false;
+
+      foreach (var key in dict.Keys)
+      {
+        string value = WebUtility.UrlEncode(dict[key]);
+
+        if (count == dict.Count - 1) end = true;
+
+        if (end) buffer.AppendFormat("{0}={1}", key, value);
+        else buffer.AppendFormat("{0}={1}&", key, value);
+
+        count++;
+      }
+
+      return buffer.ToString();
+    }
   }
 }
diff --git a/FeedlySharp/FeedlyClient.cs b/FeedlySharp/FeedlyClient.cs
index 41f0a4f..9dfe6ef 100644
--- a/FeedlySharp/FeedlyClient.cs
+++ b/FeedlySharp/FeedlyClient.cs
@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace FeedlySharp
 {
-  public partial class FeedlyClient : IDisposable, FeedlySharp.IFeedlyClient
+  public partial class FeedlyClient : IDisposable
   {
     public readonly CloudEnvironment Environment;
 
@@ -56,7 +56,7 @@ namespace FeedlySharp
 
     private string ValueToResource(string key, string value, bool encode = true)
     {
-      string text = String.Format("user/{0}/{1}/{2}", UserId, key, value);
+      string text = value.StartsWith("user/") ? value : String.Format("user/{0}/{1}/{2}", UserId, key, value);
       return encode ? WebUtility.UrlEncode(text) : text;
     }
 
diff --git a/FeedlySharp/FeedlyHttpClient.cs b/FeedlySharp/FeedlyHttpClient.cs
index d91478d..99e8ff4 100644
--- a/FeedlySharp/FeedlyHttpClient.cs
+++ b/FeedlySharp/FeedlyHttpClient.cs
@@ -58,14 +58,15 @@ namespace FeedlySharp
       CancellationToken cancellationToken = default(CancellationToken)
     )
     {
-      HttpRequestMessage request = new HttpRequestMessage(method, requestUri);
+      string append = body != null && !bodyAsJson && method == HttpMethod.Get ? ((requestUri.Contains("?") ? "&" : "?") + (body as Dictionary<string, string>).ToQueryString()) : "";
+      HttpRequestMessage request = new HttpRequestMessage(method, requestUri + append);
 
       // content of the request
-      if (body != null && !bodyAsJson)
+      if (body != null && !bodyAsJson && method != HttpMethod.Get)
       {
         request.Content = new FormUrlEncodedContent(body as Dictionary<string, string>);
       }
-      else if (body != null)
+      else if (body != null && method != HttpMethod.Get)
       {
         request.Content = new StringContent(JsonConvert.SerializeObject(body));
       }
diff --git a/FeedlySharp/FeedlySharp.csproj b/FeedlySharp/FeedlySharp.csproj
index 2303744..30374c4 100644
--- a/FeedlySharp/FeedlySharp.csproj
+++ b/FeedlySharp/FeedlySharp.csproj
@@ -36,13 +36,16 @@
   <ItemGroup>
     <Compile Include="Endpoints\Entries.cs" />
     <Compile Include="Endpoints\Feeds.cs" />
+    <Compile Include="Endpoints\Markers.cs" />
     <Compile Include="Endpoints\Subscriptions.cs" />
     <Compile Include="Endpoints\Topics.cs" />
+    <Compile Include="Models\FeedlyCategoryUnreadCount.cs" />
     <Compile Include="Models\FeedlyEntry.cs" />
     <Compile Include="Models\FeedlyFeed.cs" />
     <Compile Include="Models\FeedlyImage.cs" />
     <Compile Include="Models\FeedlyLink.cs" />
     <Compile Include="Models\FeedlyOrigin.cs" />
+    <Compile Include="Models\FeedlyReadOperations.cs" />
     <Compile Include="Models\FeedlySubscription.cs" />
     <Compile Include="Models\FeedlyText.cs" />
     <Compile Include="Models\FeedlyTopic.cs" />
diff --git a/FeedlySharp/IFeedlyClient.cs b/FeedlySharp/IFeedlyClient.cs
deleted file mode 100644
index f12d3e5..0000000
--- a/FeedlySharp/IFeedlyClient.cs
+++ /dev/null
@@ -1,42 +0,0 @@
-using System;
-using System.Threading;
-
-namespace FeedlySharp
-{
-  public interface IFeedlyClient
-  {
-    void Activate(string accessToken, string userId);
-    System.Threading.Tasks.Task<bool> AddOrUpdateSubscription(string id, System.Collections.Generic.List<FeedlySharp.Models.FeedlyCategory> categories = null, string optionalTitle = null, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> AddOrUpdateTopic(string topic, FeedlySharp.Models.Interest interest = Interest.Low, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task DeleteCategory(string id, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    void Dispose();
-    string GetAuthenticationUri(string scope = "subscriptions", string state = default(String));
-    System.Threading.Tasks.Task<System.Collections.Generic.List<FeedlySharp.Models.FeedlyCategory>> GetCategories(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.List<FeedlySharp.Models.FeedlyEntry>> GetEntries(string[] ids, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<FeedlySharp.Models.FeedlyEntry> GetEntry(string id, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<FeedlySharp.Models.FeedlyFeed> GetFeed(string id, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.List<FeedlySharp.Models.FeedlyFeed>> GetFeeds(string[] ids, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<string> GetOPML(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<string, string>> GetPreferences(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<FeedlySharp.Models.FeedlyUser> GetProfile(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.List<FeedlySharp.Models.FeedlySubscription>> GetSubscriptions(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.List<FeedlySharp.Models.FeedlyTag>> GetTags(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.List<FeedlySharp.Models.FeedlyTopic>> GetTopics(System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> ImportOPML(string opml, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    FeedlySharp.Models.AuthenticationResponse ParseAuthenticationResponseUri(string uri);
-    FeedlySharp.Models.AuthenticationResponse ParseAuthenticationResponseUri(Uri uri);
-    System.Threading.Tasks.Task<bool> RemoveSubscription(string id, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> RemoveTags(string[] entryIds, string[] tags, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> RemoveTags(string[] tags, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> RemoveTopic(string topic, FeedlySharp.Models.Interest interest = Interest.Low, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task RenameCategory(string id, string label, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> RenameTag(string oldTag, string newTag, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<FeedlySharp.Models.AccessTokenResponse> RequestAccessToken(string authenticationCode, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<FeedlySharp.Models.AccessTokenResponse> RequestRefreshToken(string refreshToken, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task RevokeRefreshToken(string refreshToken, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<string, string>> UpdatePreferences(System.Collections.Generic.Dictionary<string, string> preferences, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<FeedlySharp.Models.FeedlyUser> UpdateProfile(System.Collections.Generic.Dictionary<string, string> parameters, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> UpdateTags(string entryId, string[] tags, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-    System.Threading.Tasks.Task<bool> UpdateTags(string[] entryIds, string[] tags, System.Threading.CancellationToken cancellationToken = default(CancellationToken));
-  }
-}
diff --git a/FeedlySharp/Models/FeedlyCategoryUnreadCount.cs b/FeedlySharp/Models/FeedlyCategoryUnreadCount.cs
new file mode 100644
index 0000000..54f2526
--- /dev/null
+++ b/FeedlySharp/Models/FeedlyCategoryUnreadCount.cs
@@ -0,0 +1,21 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FeedlySharp.Models
+{
+  public class FeedlyCategoryUnreadCount
+  {
+    [JsonProperty("updated")]
+    public DateTime? UpdatedAt { get; set; }
+
+    public int Count { get; set; }
+
+    public string Id { get; set; }
+
+    public string Name { get { return Id == null ? String.Empty : Id.Split('/').Last(); } }
+  }
+}
diff --git a/FeedlySharp/Models/FeedlyReadOperations.cs b/FeedlySharp/Models/FeedlyReadOperations.cs
new file mode 100644
index 0000000..f2f1dbf
--- /dev/null
+++ b/FeedlySharp/Models/FeedlyReadOperations.cs
@@ -0,0 +1,29 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FeedlySharp.Models
+{
+  public class FeedlyReadOperations
+  {
+    [JsonProperty("feeds")]
+    public List<FeedlyReadOperationsFeed> ReadFeeds { get; set; }
+
+    [JsonProperty("entries")]
+    public List<string> ReadEntries { get; set; }
+
+    [JsonProperty("unread")]
+    public List<string> UnreadEntries { get; set; }
+  }
+
+  public class FeedlyReadOperationsFeed
+  {
+    [JsonProperty("asOf")]
+    public DateTime? ReadAt { get; set; }
+
+    public string Id { get; set; }
+  }
+}
diff --git a/FeedlySharp/Models/Responses.cs b/FeedlySharp/Models/Responses.cs
index df5e234..47ab75a 100644
--- a/FeedlySharp/Models/Responses.cs
+++ b/FeedlySharp/Models/Responses.cs
@@ -1,6 +1,7 @@
 using FeedlySharp.Extensions;
 using Newtonsoft.Json;
 using System;
+using System.Collections.Generic;
 
 namespace FeedlySharp.Models
 {
@@ -35,6 +36,13 @@ namespace FeedlySharp.Models
   }
 
 
+  internal class CategoryUnreadCountResponse
+  {
+    [JsonProperty("unreadcounts")]
+    public List<FeedlyCategoryUnreadCount> List { get; set; }
+  }
+
+
   public enum FeedlyUserAccountPlan
   {
     Standard,