diff --git a/LightlessSyncAPI/Dto/User/UserPairNotificationDto.cs b/LightlessSyncAPI/Dto/User/UserPairNotificationDto.cs
new file mode 100644
index 0000000..8cf52a4
--- /dev/null
+++ b/LightlessSyncAPI/Dto/User/UserPairNotificationDto.cs
@@ -0,0 +1,10 @@
+using MessagePack;
+
+namespace LightlessSync.API.Dto.User;
+
+[MessagePackObject(keyAsPropertyName: true)]
+public sealed class UserPairNotificationDto
+{
+    public required string myHashedCid { get; init; }
+    public required string message { get; init; }
+}
\ No newline at end of file
diff --git a/LightlessSyncAPI/SignalR/ILightlessHub.cs b/LightlessSyncAPI/SignalR/ILightlessHub.cs
index eddca39..e96513c 100644
--- a/LightlessSyncAPI/SignalR/ILightlessHub.cs
+++ b/LightlessSyncAPI/SignalR/ILightlessHub.cs
@@ -24,6 +24,7 @@ public interface ILightlessHub
     Task Client_GroupSendProfile (GroupProfileDto groupInfo);
     Task Client_GroupSendInfo(GroupInfoDto groupInfo);
     Task Client_ReceiveServerMessage(MessageSeverity messageSeverity, string message);
+    Task Client_ReceiveBroadcastPairRequest(UserPairNotificationDto dto);
     Task Client_UpdateSystemInfo(SystemInfoDto systemInfo);
     Task Client_UserAddClientPair(UserPairDto dto);
     Task Client_UserReceiveCharacterData(OnlineUserCharaDataDto dataDto);