diff --git a/ttrss/ApiClient.cs b/ttrss/ApiClient.cs
index c7d1a7b..fa8fae1 100644
--- a/ttrss/ApiClient.cs
+++ b/ttrss/ApiClient.cs
@@ -647,7 +647,7 @@ namespace ttrss_co_client.ttrss
         }
         public async Task<bool> ShareToPublished(string title, Uri url, string content, bool sanitize = true)
         {
-            if(url == null)
+            if (url == null)
             {
                 throw new ArgumentNullException("url");
             }
@@ -661,7 +661,7 @@ namespace ttrss_co_client.ttrss
             {
                 op = "shareToPublished",
                 sid = this.SessionId,
-                title =title,
+                title = title,
                 url = url.ToString(),
                 content = content,
                 sanitize = sanitize
@@ -675,7 +675,7 @@ namespace ttrss_co_client.ttrss
         ///<param name="login">probably if the feed requires basic HTTP auth; the login? (decidedly not self-explanatory, gdi)</param>
         ///<param name="password">probably if the feed requires basic HTTP auth; the password? (decidedly not self-explanatory, gdi)</param>
         ///<returns>¯\_(ツ)_/¯ - code 1 = success, I think? - the documentation says "See subscribe_to_feed() in functions.php for details" - that function doesn't exist (as of 2023-04-04).</returns>
-        public async Task<int> SubscribeToFeed(Uri feed_url, int category_id =0, string login=null, string password=null)
+        public async Task<int> SubscribeToFeed(Uri feed_url, int category_id = 0, string login = null, string password = null)
         {
             assertInitialized();
             assertApiLevel(5);
@@ -708,11 +708,20 @@ namespace ttrss_co_client.ttrss
 
             return apiResponse.ContainsKey("status") && apiResponse["status"]?.ToLower() == "ok";
         }
-        public async Task GetFeedTree()
+        ///<returns>(almost) the whole shebang, for a user</returns>
+        public async Task<Tree> GetFeedTree(bool include_empty = false)
         {
             assertInitialized();
             assertApiLevel(5);
-            throw new NotImplementedException();
+
+            var json = JsonContent.Create(new
+            {
+                op = "getFeedTree",
+                sid = this.SessionId,
+                include_empty = include_empty
+            });
+
+            return await get<Tree>(json);
         }
         private void assertInitialized()
         {
diff --git a/ttrss/datastructures/Tree.cs b/ttrss/datastructures/Tree.cs
new file mode 100644
index 0000000..c08d53c
--- /dev/null
+++ b/ttrss/datastructures/Tree.cs
@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+
+namespace ttrss_co_client.ttrss.datastructures
+{
+    public class Tree
+    {
+        public ItemCollection categories { get; set; }
+
+        public class ItemCollection
+        {
+            public string identifier { get; set; }
+            public string label { get; set; }
+            public IEnumerable<Item> items { get; set; }
+            public class Item
+            {
+                public string id { get; set; }
+                public int? bare_id { get; set; }
+                public int? auxcounter { get; set; }
+                public string name { get; set; }
+                public IEnumerable<Item> items { get; set; }
+                public bool? checkbox { get; set; }
+                public string type { get; set; }
+                public int? unread { get; set; }
+                public int? child_unread { get; set; }
+                public string param { get; set; }
+                public string fg_color { get; set; }
+                public string bg_color { get; set; }
+                public int? updates_disabled { get; set; }
+            }
+        }
+    }
+}
\ No newline at end of file