diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/appplatform.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/appplatform.json
index 3789b039a734..222022fbacf9 100644
--- a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/appplatform.json
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/appplatform.json
@@ -403,6 +403,104 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.AppPlatform/Spring/{serviceName}/stop": {
+      "post": {
+        "tags": [
+          "AppPlatform"
+        ],
+        "description": "Stop a Service.",
+        "operationId": "Services_Stop",
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "#/parameters/ServiceNameParameter"
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "Accepted. The response indicates the stop operation is performed in the background."
+          },
+          "404": {
+            "description": "Not found. The response indicates the service does not exist."
+          },
+          "409": {
+            "description": "Conflict. The response indicates the exiting Service is now updating."
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
+          }
+        },
+        "x-ms-long-running-operation": true,
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "azure-async-operation"
+        },
+        "x-ms-examples": {
+          "Services_Stop": {
+            "$ref": "./examples/Services_Stop.json"
+          }
+        }
+      }
+    },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.AppPlatform/Spring/{serviceName}/start": {
+      "post": {
+        "tags": [
+          "AppPlatform"
+        ],
+        "description": "Start a Service.",
+        "operationId": "Services_Start",
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "#/parameters/ServiceNameParameter"
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "Accepted. The response indicates the stop operation is performed in the background."
+          },
+          "404": {
+            "description": "Not found. The response indicates the service does not exist."
+          },
+          "409": {
+            "description": "Conflict. The response indicates the exiting Service is now updating."
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
+          }
+        },
+        "x-ms-long-running-operation": true,
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "azure-async-operation"
+        },
+        "x-ms-examples": {
+          "Services_Start": {
+            "$ref": "./examples/Services_Start.json"
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.AppPlatform/Spring/{serviceName}/configServers/default": {
       "get": {
         "tags": [
@@ -3061,6 +3159,19 @@
           "description": "ServiceInstanceEntity GUID which uniquely identifies a created resource",
           "type": "string",
           "readOnly": true
+        },
+        "powerState": {
+          "description": "Power state of the Service",
+          "enum": [
+            "Running",
+            "Stopped"
+          ],
+          "type": "string",
+          "readOnly": true,
+          "x-ms-enum": {
+            "name": "PowerState",
+            "modelAsString": true
+          }
         }
       }
     },
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/examples/Services_Start.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/examples/Services_Start.json
new file mode 100644
index 000000000000..0ba07b2a11fc
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/examples/Services_Start.json
@@ -0,0 +1,13 @@
+{
+    "parameters": {
+      "api-version": "2021-09-01-preview",
+      "subscriptionId": "00000000-0000-0000-0000-000000000000",
+      "resourceGroupName": "myResourceGroup",
+      "serviceName": "myservice"
+    },
+    "responses": {
+      "202": {},
+      "404": {},
+      "409": {}
+    }
+  }
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/examples/Services_Stop.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/examples/Services_Stop.json
new file mode 100644
index 000000000000..0ba07b2a11fc
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-09-01-preview/examples/Services_Stop.json
@@ -0,0 +1,13 @@
+{
+    "parameters": {
+      "api-version": "2021-09-01-preview",
+      "subscriptionId": "00000000-0000-0000-0000-000000000000",
+      "resourceGroupName": "myResourceGroup",
+      "serviceName": "myservice"
+    },
+    "responses": {
+      "202": {},
+      "404": {},
+      "409": {}
+    }
+  }