diff --git a/module/rdd-main.js b/module/rdd-main.js
index 1c7321c9..ad2e559d 100644
--- a/module/rdd-main.js
+++ b/module/rdd-main.js
@@ -217,6 +217,28 @@ function messageDeBienvenue() {
   }
 }
 
+/* -------------------------------------------- */
+// Register world usage statistics
+function registerUsageCount( registerKey ) {
+  if ( game.user.isGM ) {
+    game.settings.register(registerKey, "world-key", {
+      name: "Unique world key",
+      scope: "world",
+      config: false,
+      type: String
+    });
+
+    let worldKey = game.settings.get(registerKey, "world-key")
+    if ( worldKey == undefined || worldKey == "" ) {
+      worldKey = randomID(32)
+      game.settings.set(registerKey, "world-key", worldKey )
+    }
+    // Simple API counter
+    $.ajax(`https://jdr.lahiette.com/fvtt_appcount/count.php?name="${registerKey}"&worldKey="${worldKey}"&version="${game.release.generation}.${game.release.build}"&system="${game.system.id}"&systemversion="${game.system.data.version}"`)
+    /* -------------------------------------------- */
+  }
+}
+
 /* -------------------------------------------- */
 /*  Foundry VTT Initialization                  */
 /* -------------------------------------------- */
@@ -246,6 +268,7 @@ Hooks.once("ready", async function () {
   }
   if (Misc.isUniqueConnectedGM()) {
     messageDeBienvenue();
+    registerUsageCount( SYSTEM_RDD );
   }
 });
 
@@ -282,6 +305,7 @@ async function migrationPngWebp_1_5_34() {
     let sidebar = document.getElementById("sidebar");
     sidebar.style.width = "min-content";
   }
+
 }
 
 /* -------------------------------------------- */