diff --git a/src/main/java/org/opencord/cordvtn/api/InstanceHandler.java b/src/main/java/org/opencord/cordvtn/api/InstanceHandler.java
new file mode 100644
index 0000000..ea44857
--- /dev/null
+++ b/src/main/java/org/opencord/cordvtn/api/InstanceHandler.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.opencord.cordvtn.api;
+
+/**
+ * Handles service instance detection and removal.
+ */
+public interface InstanceHandler {
+
+    /**
+     * Handles newly detected instance.
+     *
+     * @param instance instance
+     */
+    void instanceDetected(Instance instance);
+
+    /**
+     * Handles removed instance.
+     *
+     * @param instance instance
+     */
+    void instanceRemoved(Instance instance);
+}