diff --git a/src/main/java/io/bitsquare/msg/listeners/OrderBookListener.java b/src/main/java/io/bitsquare/msg/listeners/OrderBookListener.java
new file mode 100644
index 0000000000..3ddc3f069e
--- /dev/null
+++ b/src/main/java/io/bitsquare/msg/listeners/OrderBookListener.java
@@ -0,0 +1,15 @@
+package io.bitsquare.msg.listeners;
+
+import net.tomp2p.peers.Number160;
+import net.tomp2p.storage.Data;
+
+import java.util.Map;
+
+public interface OrderBookListener
+{
+    void onOfferAdded(Data offerData, boolean success);
+
+    void onOffersReceived(Map<Number160, Data> dataMap, boolean success);
+
+    void onOfferRemoved(Data data, boolean success);
+}
\ No newline at end of file