diff --git a/daemon/face/websocket-transport.hpp b/daemon/face/websocket-transport.hpp
index 91a99c1..08542c0 100644
--- a/daemon/face/websocket-transport.hpp
+++ b/daemon/face/websocket-transport.hpp
@@ -33,16 +33,39 @@
 namespace nfd {
 namespace face {
 
-/**
- * \brief A Transport that communicates on a WebSocket connection
+/** \brief counters provided by WebSocketTransport
+ *  \note The type name 'WebSocketTransportCounters' is implementation detail.
+ *        Use 'WebSocketTransport::Counters' in public API.
  */
-class WebSocketTransport DECL_FINAL : public Transport
+class WebSocketTransportCounters : public virtual Transport::Counters
 {
 public:
+  /** \brief count of outgoing Pings
+   */
+  PacketCounter nOutPings;
+
+  /** \brief count of incoming Pongs
+   */
+  PacketCounter nInPongs;
+};
+
+/** \brief A Transport that communicates on a WebSocket connection
+ */
+class WebSocketTransport DECL_FINAL : public Transport
+                                    , protected virtual WebSocketTransportCounters
+{
+public:
+  /** \brief counters provided by WebSocketTransport
+   */
+  typedef WebSocketTransportCounters Counters;
+
   WebSocketTransport(websocketpp::connection_hdl hdl,
                      websocket::Server& server,
                      time::milliseconds pingInterval);
 
+  virtual const Counters&
+  getCounters() const DECL_OVERRIDE;
+
   /** \brief Translates a message into a Block
    *         and delivers it to the link service
    */
@@ -82,6 +105,12 @@
   scheduler::ScopedEventId m_pingEventId;
 };
 
+inline const WebSocketTransport::Counters&
+WebSocketTransport::getCounters() const
+{
+  return *this;
+}
+
 } // namespace face
 } // namespace nfd