diff --git a/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsDelegate.java b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsDelegate.java
new file mode 100644
index 0000000..a402419
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsDelegate.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2018-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.aaa;
+
+import org.onosproject.store.StoreDelegate;
+
+/**
+ * Delegate for Authentication Statistics.
+ */
+public interface AaaMachineStatisticsDelegate extends StoreDelegate<AaaMachineStatisticsEvent> {
+
+}
diff --git a/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsEvent.java b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsEvent.java
new file mode 100644
index 0000000..1c130dc
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsEvent.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2018-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.aaa;
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * Event indicating the Accounting Data of AAA.
+ */
+public class AaaMachineStatisticsEvent extends
+        AbstractEvent<AaaMachineStatisticsEvent.Type, AaaSupplicantMachineStats> {
+/**
+ * Accounting data.
+ * Machine Statistic event type.
+ */
+    public enum Type {
+        /**
+         * signifies that the Machine Statistics Event stats has been updated.
+         */
+        STATS_UPDATE
+    }
+    public AaaMachineStatisticsEvent(Type type, AaaSupplicantMachineStats stats) {
+        super(type, stats);
+    }
+}
\ No newline at end of file
diff --git a/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsEventListener.java b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsEventListener.java
new file mode 100644
index 0000000..28681eb
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsEventListener.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2018-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.aaa;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Listener for accounting events.
+ */
+public interface AaaMachineStatisticsEventListener extends
+EventListener<AaaMachineStatisticsEvent> {
+}
diff --git a/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsService.java b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsService.java
new file mode 100644
index 0000000..11095b3
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsService.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2018-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.aaa;
+
+import org.onosproject.event.ListenerService;
+
+/**
+ * Service for interacting with authentication module.
+ */
+public interface AaaMachineStatisticsService
+        extends ListenerService<AaaMachineStatisticsEvent, AaaMachineStatisticsEventListener> {
+    /**
+     * To get Supplicant machine stat.
+     *
+     * @param obj State Machine instance.
+     * @return supplicant stats.
+     */
+    public AaaSupplicantMachineStats getSupplicantStats(Object obj);
+
+    /**
+     * Returns AaaMachineStatisticsDelegate object.
+     *
+     * @return AaaMachineStatisticsDelegate.
+     */
+    public AaaMachineStatisticsDelegate getMachineStatsDelegate();
+
+    /**
+     * Log the Machine stats.
+     *
+     * @param obj of AaaSupplicantMachineStats.
+     */
+    void logAaaSupplicantMachineStats(AaaSupplicantMachineStats obj);
+
+}
diff --git a/api/src/main/java/org/opencord/aaa/AaaSupplicantMachineStats.java b/api/src/main/java/org/opencord/aaa/AaaSupplicantMachineStats.java
new file mode 100644
index 0000000..87fa2f5
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaSupplicantMachineStats.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2018-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.aaa;
+
+public class AaaSupplicantMachineStats {
+
+        private String sessionId;
+
+        private String sessionName;
+
+        private long sessionDuration;
+
+        private long totalFramesReceived;
+
+        private long totalFramesSent;
+
+        private long totalPacketsRecieved;
+
+        private long totalPacketsSent;
+
+        private long totalOctetRecieved;
+
+        private long totalOctetSent;
+
+        private String eapolType;
+
+        private String srcMacAddress;
+
+        private String sessionTerminateReason;
+
+        public String getSessionId() {
+                return sessionId;
+        }
+
+        public void setSessionId(String sessionId) {
+                this.sessionId = sessionId;
+        }
+
+        public String getSessionName() {
+                return sessionName;
+        }
+
+        public void setSessionName(String sessionName) {
+                this.sessionName = sessionName;
+        }
+
+        public long getSessionDuration() {
+                return sessionDuration;
+        }
+
+        public void setSessionDuration(long sessionDuration) {
+                this.sessionDuration = sessionDuration;
+        }
+
+        public long getTotalFramesReceived() {
+                return totalFramesReceived;
+        }
+
+        public void setTotalFramesReceived(long totalFramesReceived) {
+                this.totalFramesReceived = totalFramesReceived;
+        }
+
+        public String getEapolType() {
+                return eapolType;
+        }
+
+        public void setEapolType(String eapolType) {
+                this.eapolType = eapolType;
+        }
+
+        public String getSrcMacAddress() {
+                return srcMacAddress;
+        }
+
+        public void setSrcMacAddress(String srcMacAddress) {
+                this.srcMacAddress = srcMacAddress;
+        }
+
+        public long getTotalFramesSent() {
+                return totalFramesSent;
+        }
+
+        public void setTotalFramesSent(long totalFramesSent) {
+                this.totalFramesSent = totalFramesSent;
+        }
+
+        public long getTotalPacketsRecieved() {
+                return totalPacketsRecieved;
+        }
+
+        public void setTotalPacketsRecieved(long totalPacketsRecieved) {
+                this.totalPacketsRecieved = totalPacketsRecieved;
+        }
+
+        public long getTotalPacketsSent() {
+                return totalPacketsSent;
+        }
+
+        public void setTotalPacketsSent(long totalPacketsSent) {
+                this.totalPacketsSent = totalPacketsSent;
+        }
+
+        public long getTotalOctetRecieved() {
+                return totalOctetRecieved;
+        }
+
+        public void setTotalOctetRecieved(long totalOctetRecieved) {
+                this.totalOctetRecieved = totalOctetRecieved;
+        }
+
+        public long getTotalOctetSent() {
+                return totalOctetSent;
+        }
+
+        public void setTotalOctetSent(long totalOctetSent) {
+                this.totalOctetSent = totalOctetSent;
+        }
+
+        public String getSessionTerminateReason() {
+                return sessionTerminateReason;
+        }
+
+        public void setSessionTerminateReason(String sessionTerminateReason) {
+                this.sessionTerminateReason = sessionTerminateReason;
+        }
+
+}