diff --git a/src/wavespeed/serverless/__init__.py b/src/wavespeed/serverless/__init__.py
index 407b500..ecac156 100644
--- a/src/wavespeed/serverless/__init__.py
+++ b/src/wavespeed/serverless/__init__.py
@@ -56,8 +56,8 @@ def _parse_args() -> argparse.Namespace:
         "--waverless_api_host",
         "--rp_api_host",
         type=str,
-        default="localhost",
-        help="API server host (default: localhost)",
+        default="0.0.0.0",
+        help="API server host (default: 0.0.0.0)",
     )
     parser.add_argument(
         "--waverless_api_port",
@@ -160,6 +160,17 @@ def handler(job):
             port=args.waverless_api_port,
         )
     else:
-        # Standard worker mode
+        # Standard worker mode with health check server
         log.info("Starting serverless worker...")
-        run_worker(config)
+        from .modules.health import HealthServer
+
+        health_server = HealthServer(
+            host=args.waverless_api_host,
+            port=args.waverless_api_port,
+        )
+        health_server.start()
+
+        try:
+            run_worker(config)
+        finally:
+            health_server.stop()
diff --git a/src/wavespeed/serverless/modules/health.py b/src/wavespeed/serverless/modules/health.py
new file mode 100644
index 0000000..b63e686
--- /dev/null
+++ b/src/wavespeed/serverless/modules/health.py
@@ -0,0 +1,59 @@
+"""Lightweight health check HTTP server for worker mode."""
+
+import threading
+from http.server import BaseHTTPRequestHandler, HTTPServer
+from typing import Optional
+
+from .logger import log
+
+
+class HealthHandler(BaseHTTPRequestHandler):
+    """Simple HTTP handler for health checks."""
+
+    def do_GET(self) -> None:
+        """Handle GET requests."""
+        if self.path == "/health":
+            self.send_response(200)
+            self.send_header("Content-Type", "application/json")
+            self.end_headers()
+            self.wfile.write(b'{"status": "ok"}')
+        else:
+            self.send_response(404)
+            self.end_headers()
+
+    def log_message(self, format: str, *args) -> None:
+        """Suppress default logging."""
+        pass
+
+
+class HealthServer:
+    """Background health check server."""
+
+    def __init__(self, host: str = "0.0.0.0", port: int = 8000):
+        """Initialize the health server.
+
+        Args:
+            host: Host to bind to.
+            port: Port to bind to.
+        """
+        self.host = host
+        self.port = port
+        self._server: Optional[HTTPServer] = None
+        self._thread: Optional[threading.Thread] = None
+
+    def start(self) -> None:
+        """Start the health server in a background thread."""
+        try:
+            self._server = HTTPServer((self.host, self.port), HealthHandler)
+            self._thread = threading.Thread(target=self._server.serve_forever, daemon=True)
+            self._thread.start()
+            log.info(f"Health server started at http://{self.host}:{self.port}/health")
+        except Exception as e:
+            log.error(f"Failed to start health server: {e}")
+
+    def stop(self) -> None:
+        """Stop the health server."""
+        if self._server:
+            self._server.shutdown()
+            self._server = None
+            log.debug("Health server stopped")