diff --git a/fundamentals/minimal-apis/samples/KeyServiceController/KeyServiceController.csproj b/fundamentals/minimal-apis/samples/KeyServiceController/KeyServiceController.csproj
new file mode 100644
index 0000000..1b28a01
--- /dev/null
+++ b/fundamentals/minimal-apis/samples/KeyServiceController/KeyServiceController.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>
diff --git a/fundamentals/minimal-apis/samples/KeyServiceController/Program.cs b/fundamentals/minimal-apis/samples/KeyServiceController/Program.cs
new file mode 100644
index 0000000..3157a40
--- /dev/null
+++ b/fundamentals/minimal-apis/samples/KeyServiceController/Program.cs
@@ -0,0 +1,49 @@
+using Microsoft.AspNetCore.Mvc;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddKeyedSingleton<ICache, BigCache>("big");
+builder.Services.AddKeyedSingleton<ICache, SmallCache>("small");
+builder.Services.AddControllers();
+
+var app = builder.Build();
+
+app.MapControllers();
+
+app.Run();
+
+public interface ICache
+{
+    object Get(string key);
+}
+public class BigCache : ICache
+{
+    public object Get(string key) => $"Resolving {key} from big cache.";
+}
+
+public class SmallCache : ICache
+{
+    public object Get(string key) => $"Resolving {key} from small cache.";
+}
+
+[ApiController]
+[Route("/cache")]
+public class CustomServicesApiController : Controller
+{
+    public ActionResult<object> GetOk(ICache cache)
+    {
+        return cache.Get("data-mvc");
+    }
+
+    [HttpGet("big")]
+    public ActionResult<object> GetBigCache([FromKeyedServices("big")] ICache cache)
+    {
+        return GetOk(cache);
+    }
+
+    [HttpGet("small")]
+    public ActionResult<object> GetSmallCache([FromKeyedServices("small")] ICache cache)
+    {
+        return GetOk(cache);
+    }
+}
diff --git a/fundamentals/minimal-apis/samples/KeyServiceController/appsettings.json b/fundamentals/minimal-apis/samples/KeyServiceController/appsettings.json
new file mode 100644
index 0000000..10f68b8
--- /dev/null
+++ b/fundamentals/minimal-apis/samples/KeyServiceController/appsettings.json
@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}
diff --git a/fundamentals/minimal-apis/samples/KeyServiceMinAPI/KeyServiceMinAPI.csproj b/fundamentals/minimal-apis/samples/KeyServiceMinAPI/KeyServiceMinAPI.csproj
new file mode 100644
index 0000000..1b28a01
--- /dev/null
+++ b/fundamentals/minimal-apis/samples/KeyServiceMinAPI/KeyServiceMinAPI.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>
diff --git a/fundamentals/minimal-apis/samples/KeyServiceMinAPI/Program.cs b/fundamentals/minimal-apis/samples/KeyServiceMinAPI/Program.cs
new file mode 100644
index 0000000..e8adc48
--- /dev/null
+++ b/fundamentals/minimal-apis/samples/KeyServiceMinAPI/Program.cs
@@ -0,0 +1,26 @@
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddKeyedSingleton<ICache, BigCache>("big");
+builder.Services.AddKeyedSingleton<ICache, SmallCache>("small");
+
+var app = builder.Build();
+
+app.MapGet("/big", ([FromKeyedServices("big")] ICache bigCache) => bigCache.Get("date"));
+
+app.MapGet("/small", ([FromKeyedServices("small")] ICache smallCache) => smallCache.Get("date"));
+
+app.Run();
+
+public interface ICache
+{
+    object Get(string key);
+}
+public class BigCache : ICache
+{
+    public object Get(string key) => $"Resolving {key} from big cache.";
+}
+
+public class SmallCache : ICache
+{
+    public object Get(string key) => $"Resolving {key} from small cache.";
+}
diff --git a/fundamentals/minimal-apis/samples/KeyServiceMinAPI/appsettings.json b/fundamentals/minimal-apis/samples/KeyServiceMinAPI/appsettings.json
new file mode 100644
index 0000000..10f68b8
--- /dev/null
+++ b/fundamentals/minimal-apis/samples/KeyServiceMinAPI/appsettings.json
@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}