diff --git a/MareSynchronosAPI/API.cs b/MareSynchronosAPI/API.cs
index 9162756..9b34b33 100644
--- a/MareSynchronosAPI/API.cs
+++ b/MareSynchronosAPI/API.cs
@@ -2,7 +2,7 @@
 {
     public class Api
     {
-        public const int Version = 14;
+        public const int Version = 15;
         public const string Path = "/mare";
 
         public const string SendFileAbortUpload = "AbortUpload";
@@ -11,6 +11,7 @@
         public const string SendFileUploadFileStreamAsync = "UploadFileStreamAsync";
         public const string InvokeGetFilesSizes = "GetFilesSizes";
         public const string SendFileDeleteAllFiles = "DeleteAllFiles";
+        public const string InvokeCheckClientHealth = "CheckClientHealth";
 
         public const string InvokeHeartbeat = "Heartbeat";
         public const string OnUpdateSystemInfo = "OnUpdateSystemInfo";
@@ -42,5 +43,22 @@
         public const string OnUserReceiveCharacterData = "ReceiveCharacterData";
         public const string OnUserRemoveOnlinePairedPlayer = "RemoveOnlinePairedPlayer";
         public const string OnUserAddOnlinePairedPlayer = "AddOnlinePairedPlayer";
+
+        public const string InvokeGroupChangePassword = "GroupChangePassword";
+        public const string InvokeGroupCreate = "CreateGroup";
+        public const string InvokeGroupGetGroups = "GetGroups";
+        public const string InvokeGroupGetUsersInGroup = "GetUsersInGroup";
+        public const string SendGroupChangeInviteState = "GroupChangeInviteState";
+        public const string SendGroupDelete = "DeleteGroup";
+        public const string InvokeGroupJoin = "JoinGroup";
+        public const string SendGroupLeave = "LeaveGroup";
+        public const string SendGroupPause = "PauseGroup";
+        public const string SendGroupRemoveUser = "RemoveUserFromGroup";
+        public const string SendGroupChangeOwner = "ChangeOwnerOfGroup";
+        public const string SendGroupChangePinned = "ChangedPinnedUserInGroup";
+        public const string SendGroupClear = "ClearGroup";
+
+        public const string OnGroupChange = "OnGroupPushChange";
+        public const string OnGroupUserChange = "OnGroupUserChange";
     }
 }
diff --git a/MareSynchronosAPI/ConnectionDto.cs b/MareSynchronosAPI/ConnectionDto.cs
index 0c8b15c..bb5459e 100644
--- a/MareSynchronosAPI/ConnectionDto.cs
+++ b/MareSynchronosAPI/ConnectionDto.cs
@@ -6,5 +6,14 @@
         public bool IsAdmin { get; set; }
         public bool IsModerator { get; set; }
         public string UID { get; set; }
+        public ServerInfoDto ServerInfo { get; set; }
+    }
+
+    public record ServerInfoDto
+    {
+        public string ShardName { get; set; }
+        public int MaxGroupUserCount { get; set; }
+        public int MaxGroupsCreatedByUser { get; set; }
+        public int MaxGroupsJoinedByUser { get; set; }
     }
 }
diff --git a/MareSynchronosAPI/GroupCreatedDto.cs b/MareSynchronosAPI/GroupCreatedDto.cs
new file mode 100644
index 0000000..d67373e
--- /dev/null
+++ b/MareSynchronosAPI/GroupCreatedDto.cs
@@ -0,0 +1,8 @@
+namespace MareSynchronos.API
+{
+    public record GroupCreatedDto
+    {
+        public string GID { get; set; }
+        public string Password { get; set; }
+    }
+}
diff --git a/MareSynchronosAPI/GroupDto.cs b/MareSynchronosAPI/GroupDto.cs
new file mode 100644
index 0000000..c5733e6
--- /dev/null
+++ b/MareSynchronosAPI/GroupDto.cs
@@ -0,0 +1,12 @@
+namespace MareSynchronos.API
+{
+    public record GroupDto
+    {
+        public string GID { get; set; }
+        public string? OwnedBy { get; set; }
+        public bool? InvitesEnabled { get; set; }
+        public bool? IsPaused { get; set; }
+        public bool? IsDeleted { get; set; }
+        public string? Alias { get; set; }
+    }
+}
diff --git a/MareSynchronosAPI/GroupPairDto.cs b/MareSynchronosAPI/GroupPairDto.cs
new file mode 100644
index 0000000..d412ba8
--- /dev/null
+++ b/MareSynchronosAPI/GroupPairDto.cs
@@ -0,0 +1,12 @@
+namespace MareSynchronos.API
+{
+    public record GroupPairDto
+    {
+        public string GroupGID { get; set; }
+        public string UserUID { get; set; }
+        public string? UserAlias { get; set; }
+        public bool? IsPaused { get; set; }
+        public bool? IsRemoved { get; set; }
+        public bool? IsPinned { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/MareSynchronosAPI/SystemInfoDto.cs b/MareSynchronosAPI/SystemInfoDto.cs
index 37f1298..de10f6c 100644
--- a/MareSynchronosAPI/SystemInfoDto.cs
+++ b/MareSynchronosAPI/SystemInfoDto.cs
@@ -2,12 +2,6 @@
 {
     public record SystemInfoDto
     {
-        public double CpuUsage { get; set; }
-        public long CacheUsage { get; set; }
-        public int UploadedFiles { get; set; }
-        public double NetworkIn { get; set; }
-        public double NetworkOut { get; set; }
         public int OnlineUsers { get; set; }
-        public long RAMUsage { get; set; }
     }
 }