diff --git a/whatsapp-gateway/baileys-client.js b/whatsapp-gateway/baileys-client.js
index 05ba2de..e60190d 100644
--- a/whatsapp-gateway/baileys-client.js
+++ b/whatsapp-gateway/baileys-client.js
@@ -437,6 +437,24 @@ async function sendMessage(session_key, phone, message, mediaUrl = null, audioBa
     return sentMsg;
 }
 
+async function checkContact(session_key, phone) {
+    const sock = sessions.get(session_key);
+    if (!sock) {
+        throw new Error(`Session ${session_key} is not active or connected`);
+    }
+    const jid = phone.includes('@') ? phone : `${phone}@s.whatsapp.net`;
+    try {
+        const result = await sock.onWhatsApp(jid);
+        if (result && result.length > 0) {
+            return result[0];
+        }
+        return { exists: false, jid };
+    } catch (err) {
+        console.error(`[Baileys] Error checking contact ${jid}:`, err.message);
+        throw err;
+    }
+}
+
 function getActiveSessions() {
     return Array.from(sessions.keys());
 }
@@ -445,6 +463,7 @@ module.exports = {
     startSession,
     disconnectSession,
     sendMessage,
-    getActiveSessions
+    getActiveSessions,
+    checkContact
 };
 
diff --git a/whatsapp-gateway/server.js b/whatsapp-gateway/server.js
index b2e7934..09f75c4 100644
--- a/whatsapp-gateway/server.js
+++ b/whatsapp-gateway/server.js
@@ -20,7 +20,7 @@ for (const p of envPaths) {
 
 const express = require('express');
 const cors = require('cors');
-const { startSession, disconnectSession, sendMessage, getActiveSessions } = require('./baileys-client');
+const { startSession, disconnectSession, sendMessage, getActiveSessions, checkContact } = require('./baileys-client');
 
 const app = express();
 app.use(cors());
@@ -82,6 +82,23 @@ app.get('/api/sessions/active', (req, res) => {
     res.json({ status: 'success', active_sessions: getActiveSessions() });
 });
 
+// Check if contact is on WhatsApp
+app.post('/api/contacts/check', async (req, res) => {
+    const { session_key, phone } = req.body;
+
+    if (!session_key || !phone) {
+        return res.status(400).json({ error: 'Missing session_key or phone' });
+    }
+
+    try {
+        const result = await checkContact(session_key, phone);
+        res.json({ status: 'success', data: result });
+    } catch (err) {
+        console.error(`Error checking contact ${phone} via ${session_key}:`, err);
+        res.status(500).json({ error: err.message || 'Failed to check contact' });
+    }
+});
+
 // Send outbound message
 app.post('/api/messages/send', async (req, res) => {
     const { session_key, phone, message, media_url, audio, mimetype, image } = req.body;