diff --git a/api/src/main/java/org/opencord/bng/BngStatsService.java b/api/src/main/java/org/opencord/bng/BngStatsService.java
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+++ b/api/src/main/java/org/opencord/bng/BngStatsService.java
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+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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.bng;
+
+import org.onosproject.event.ListenerService;
+import org.onosproject.net.behaviour.BngProgrammable;
+import org.onosproject.net.pi.runtime.PiCounterCellData;
+
+import java.util.Map;
+
+/**
+ * Service to retrieve attachment statistics.
+ */
+public interface BngStatsService
+        extends ListenerService<BngStatsEvent, BngStatsEventListener> {
+
+    /**
+     * Returns the statistics given an attachment Key. If the attachment is not
+     * programmed in the ASG, it returns an empty map. If one of the counter
+     * type is not supported by the ASG device, that specific counter will not
+     * be found in the map.
+     *
+     * @param bngAttachmentKey The attachment Key
+     * @return A map with the type of the counter and the associated statistics
+     * coming from the ASG device. Empty map if no BNG programmable is
+     * available.
+     */
+    Map<BngProgrammable.BngCounterType, PiCounterCellData> getStats(String bngAttachmentKey);
+
+    /**
+     * Returns the aggregate statistics related to attachments that are not
+     * known by this app, e.g., packets that are sent from an attachment while
+     * the attachment is negotiating the session.
+     *
+     * @return The statistics of not registered attachment. null if no BNG
+     * programmable device is available.
+     */
+    PiCounterCellData getControlStats();
+
+}