diff --git a/Nocr.TelegramListener.Async.Api.Contracts/Events/TextUpdateReceived.cs b/Nocr.TelegramListener.Async.Api.Contracts/Events/TextUpdateReceived.cs
new file mode 100644
index 0000000..4cc2a9a
--- /dev/null
+++ b/Nocr.TelegramListener.Async.Api.Contracts/Events/TextUpdateReceived.cs
@@ -0,0 +1,8 @@
+using Nocr.TelegramListener.Core.Events;
+
+namespace Nocr.TelegramListener.Async.Api.Contracts.Events;
+
+public sealed class TextUpdateReceived : IEvent
+{
+    public Guid Id { get; } = Guid.NewGuid();
+}
\ No newline at end of file
diff --git a/Nocr.TelegramListener.Async.Api.Contracts/Nocr.TelegramListener.Async.Api.Contracts.csproj b/Nocr.TelegramListener.Async.Api.Contracts/Nocr.TelegramListener.Async.Api.Contracts.csproj
new file mode 100644
index 0000000..535435b
--- /dev/null
+++ b/Nocr.TelegramListener.Async.Api.Contracts/Nocr.TelegramListener.Async.Api.Contracts.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\src\Nocr.TelegramListener.Core\Nocr.TelegramListener.Core.csproj" />
+    </ItemGroup>
+
+</Project>
diff --git a/Nocr.TelegramListener.sln b/Nocr.TelegramListener.sln
index 5ff4cb1..7073f76 100644
--- a/Nocr.TelegramListener.sln
+++ b/Nocr.TelegramListener.sln
@@ -14,6 +14,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Nocr.TelegramListener.AppSe
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Nocr.TelegramListener.Host", "src\Nocr.TelegramListener.Host\Nocr.TelegramListener.Host.csproj", "{58D5C9FD-75A9-4FFB-9FBD-BE8E9FCE3016}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Nocr.TelegramListener.Async.Api.Contracts", "Nocr.TelegramListener.Async.Api.Contracts\Nocr.TelegramListener.Async.Api.Contracts.csproj", "{536162CC-15E0-4589-A52A-30C0D08D2F4D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -32,5 +34,9 @@ Global
 		{58D5C9FD-75A9-4FFB-9FBD-BE8E9FCE3016}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{58D5C9FD-75A9-4FFB-9FBD-BE8E9FCE3016}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{58D5C9FD-75A9-4FFB-9FBD-BE8E9FCE3016}.Release|Any CPU.Build.0 = Release|Any CPU
+		{536162CC-15E0-4589-A52A-30C0D08D2F4D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{536162CC-15E0-4589-A52A-30C0D08D2F4D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{536162CC-15E0-4589-A52A-30C0D08D2F4D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{536162CC-15E0-4589-A52A-30C0D08D2F4D}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal
diff --git a/src/Nocr.TelegramListener.AppServices/Nocr.TelegramListener.AppServices.csproj b/src/Nocr.TelegramListener.AppServices/Nocr.TelegramListener.AppServices.csproj
index d7f9890..ae0057e 100644
--- a/src/Nocr.TelegramListener.AppServices/Nocr.TelegramListener.AppServices.csproj
+++ b/src/Nocr.TelegramListener.AppServices/Nocr.TelegramListener.AppServices.csproj
@@ -5,6 +5,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <ProjectReference Include="..\..\Nocr.TelegramListener.Async.Api.Contracts\Nocr.TelegramListener.Async.Api.Contracts.csproj" />
       <ProjectReference Include="..\Nocr.TelegramListener.Core\Nocr.TelegramListener.Core.csproj" />
     </ItemGroup>
 
diff --git a/src/Nocr.TelegramListener.Core/Events/IEvent.cs b/src/Nocr.TelegramListener.Core/Events/IEvent.cs
new file mode 100644
index 0000000..4630139
--- /dev/null
+++ b/src/Nocr.TelegramListener.Core/Events/IEvent.cs
@@ -0,0 +1,6 @@
+namespace Nocr.TelegramListener.Core.Events;
+
+public interface IEvent
+{
+    public Guid Id { get; }
+}
\ No newline at end of file
diff --git a/src/Nocr.TelegramListener.Core/Nocr.TelegramListener.Core.csproj b/src/Nocr.TelegramListener.Core/Nocr.TelegramListener.Core.csproj
index bef0383..2ef1a36 100644
--- a/src/Nocr.TelegramListener.Core/Nocr.TelegramListener.Core.csproj
+++ b/src/Nocr.TelegramListener.Core/Nocr.TelegramListener.Core.csproj
@@ -1,2 +1 @@
-<Project Sdk="Microsoft.NET.Sdk">
-</Project>
+<Project Sdk="Microsoft.NET.Sdk" />