diff --git a/zz-extra/spotter-ping.php b/zz-extra/spotter-ping.php
new file mode 100644
index 0000000..3303240
--- /dev/null
+++ b/zz-extra/spotter-ping.php
@@ -0,0 +1,19 @@
+<?php
+$url = (string)filter_input(INPUT_POST, 'url');
+if (empty($url)) {
+    exit;
+}
+
+if(substr($url, -1) == '/') {
+    $url = substr($url, 0, -1);
+}
+$url .= '/spotter-ping';
+
+$ch = curl_init($url);
+curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_HEADER => FALSE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, CURLOPT_TIMEOUT => 4]);
+$content = curl_exec($ch);
+curl_close($ch);
+
+if ($content == 'spotter-pong') {
+    echo 'spotter-pong';
+}