diff --git a/src/symposium/core/api.py b/src/symposium/core/api.py
index 34bf3d4..9ed2bac 100644
--- a/src/symposium/core/api.py
+++ b/src/symposium/core/api.py
@@ -65,7 +65,11 @@ def __init__(self, api_key: str, **kwargs):
             **kwargs: Additional configuration (model, temperature, max_tokens, etc.)
         """
         super().__init__(api_key, **kwargs)
-        self.client = OpenAI(api_key=api_key, base_url="https://api.perplexity.ai")
+        self.client = OpenAI(
+            api_key=api_key,
+            base_url="https://api.perplexity.ai",
+            default_headers={"X-Pplx-Integration": "symposium"},
+        )
         self.model = kwargs.get("model", "sonar")
         self.temperature = kwargs.get("temperature", 0.7)
         self.max_tokens = kwargs.get("max_tokens", 2000)
diff --git a/tests/test_core/test_api.py b/tests/test_core/test_api.py
index 3e51f98..58cb019 100644
--- a/tests/test_core/test_api.py
+++ b/tests/test_core/test_api.py
@@ -60,7 +60,11 @@ def test_init(self, mock_openai):
         provider = PerplexityProvider("test_key")
         assert provider.api_key == "test_key"
         assert provider.model == "sonar"
-        mock_openai.assert_called_once()
+        mock_openai.assert_called_once_with(
+            api_key="test_key",
+            base_url="https://api.perplexity.ai",
+            default_headers={"X-Pplx-Integration": "symposium"},
+        )
 
     @patch("symposium.core.api.OpenAI")
     def test_get_response(self, mock_openai):
@@ -101,6 +105,7 @@ def test_init(self, mock_openai):
         assert provider.api_key == "test_key"
         assert provider.model == "anthropic/claude-3.5-sonnet"
         mock_openai.assert_called_once()
+        assert "default_headers" not in mock_openai.call_args.kwargs
 
     @patch("symposium.core.api.OpenAI")
     def test_get_response(self, mock_openai):