diff --git a/src/routes/authRoutes.js b/src/routes/authRoutes.js
index 170252d..9c21521 100644
--- a/src/routes/authRoutes.js
+++ b/src/routes/authRoutes.js
@@ -1184,4 +1184,122 @@ router.post(
   }
 );
 
+// POST /auth/validate-token
+// Endpoint for other services (like BuySellService) to validate JWT tokens
+// This allows centralized token validation
+router.post('/validate-token', async (req, res) => {
+  try {
+    const { token } = req.body;
+
+    if (!token) {
+      return res.status(400).json({ 
+        valid: false, 
+        error: 'Token is required' 
+      });
+    }
+
+    // Use the auth middleware logic to validate token
+    const jwt = require('jsonwebtoken');
+    const { getKeySecret, getAllKeys, validateTokenClaims } = require('../services/jwtKeys');
+    const db = require('../db');
+
+    // Decode token to get key ID from header
+    let decoded;
+    try {
+      decoded = jwt.decode(token, { complete: true });
+      if (!decoded || !decoded.header) {
+        return res.json({ valid: false, error: 'Invalid token format' });
+      }
+    } catch (err) {
+      return res.json({ valid: false, error: 'Invalid token' });
+    }
+
+    // Get secret for the key ID (if present) or try all keys
+    const keyId = decoded.header.kid;
+    let payload = null;
+    let verified = false;
+
+    if (keyId) {
+      const secret = getKeySecret(keyId);
+      if (secret) {
+        try {
+          payload = jwt.verify(token, secret);
+          verified = true;
+        } catch (err) {
+          return res.json({ valid: false, error: 'Invalid or expired token' });
+        }
+      }
+    }
+
+    // If key ID not found or not specified, try all keys (for rotation support)
+    if (!verified) {
+      const allKeys = getAllKeys();
+      for (const [kid, keySecret] of Object.entries(allKeys)) {
+        try {
+          payload = jwt.verify(token, keySecret);
+          verified = true;
+          break;
+        } catch (err) {
+          continue;
+        }
+      }
+    }
+
+    if (!verified || !payload) {
+      return res.json({ valid: false, error: 'Invalid or expired token' });
+    }
+
+    // Validate JWT claims (iss, aud, exp, iat, nbf)
+    const claimsValidation = validateTokenClaims(payload);
+    if (!claimsValidation.valid) {
+      return res.json({ valid: false, error: 'Invalid token claims' });
+    }
+
+    // Validate token_version to ensure token hasn't been invalidated by logout-all-devices
+    try {
+      const { rows } = await db.query(
+        `SELECT COALESCE(token_version, 1) as token_version FROM users WHERE id = $1`,
+        [payload.sub]
+      );
+      
+      if (rows.length === 0) {
+        return res.json({ valid: false, error: 'User not found' });
+      }
+
+      const userTokenVersion = rows[0].token_version;
+      const tokenVersion = payload.token_version || 1;
+
+      // If token version doesn't match, token has been invalidated
+      if (tokenVersion !== userTokenVersion) {
+        return res.json({ valid: false, error: 'Token has been invalidated' });
+      }
+    } catch (dbErr) {
+      // Handle missing token_version column gracefully
+      if (dbErr.code === '42703' && dbErr.message && dbErr.message.includes('token_version')) {
+        console.warn('token_version column not found in database, skipping version check');
+        // Continue without token version validation
+      } else {
+        console.error('Error validating token version:', dbErr);
+        return res.status(500).json({ valid: false, error: 'Internal server error' });
+      }
+    }
+
+    // Token is valid - return user info
+    return res.json({
+      valid: true,
+      payload: {
+        sub: payload.sub,
+        role: payload.role,
+        user_type: payload.user_type,
+        phone_number: payload.phone_number,
+        token_version: payload.token_version || 1,
+        high_assurance: payload.high_assurance || false,
+      },
+    });
+  } catch (err) {
+    console.error('validate-token error:', err);
+    return res.status(500).json({ valid: false, error: 'Internal server error' });
+  }
+});
+
 module.exports = router;