diff --git a/gateway/config.py b/gateway/config.py
index eb92d833e23..0ebf23e12d0 100644
--- a/gateway/config.py
+++ b/gateway/config.py
@@ -493,6 +493,13 @@ _PLATFORM_CONNECTED_CHECKERS: dict[Platform, Callable[[PlatformConfig], bool]] =
         (cfg.extra.get("client_id") or os.getenv("DINGTALK_CLIENT_ID"))
         and (cfg.extra.get("client_secret") or os.getenv("DINGTALK_CLIENT_SECRET"))
     ),
+    # Relay dials OUT to a connector; it is "connected" once an endpoint URL is
+    # configured (extra["relay_url"] or extra["url"]). The capability descriptor
+    # is negotiated at handshake time, so the URL is the only config-level
+    # signal in the experimental phase. EXPERIMENTAL — may change.
+    Platform.RELAY: lambda cfg: bool(
+        cfg.extra.get("relay_url") or cfg.extra.get("url")
+    ),
 }
 
 
diff --git a/tests/gateway/test_platform_connected_checkers.py b/tests/gateway/test_platform_connected_checkers.py
index f7677a3a676..e53e0fa4cfc 100644
--- a/tests/gateway/test_platform_connected_checkers.py
+++ b/tests/gateway/test_platform_connected_checkers.py
@@ -98,6 +98,8 @@ def test_checker_returns_true_when_configured(platform, checker, monkeypatch):
         mock_config.extra = {"app_id": "app", "app_secret": "sec"}
     elif platform == Platform.DINGTALK:
         mock_config.extra = {"client_id": "id", "client_secret": "sec"}
+    elif platform == Platform.RELAY:
+        mock_config.extra = {"relay_url": "wss://connector.example/relay"}
     else:
         pytest.skip(f"No synthetic config defined for {platform.value}")