diff --git a/segmind/__init__.py b/segmind/__init__.py
index c6c9bd6..09ed4ca 100644
--- a/segmind/__init__.py
+++ b/segmind/__init__.py
@@ -38,7 +38,7 @@
     InferenceTimeout,
 )
 
-__version__ = "1.0.0"
+__version__ = "1.0.1"
 
 # Default client (lazily initialized)
 _default_client: Optional[SegmindClient] = None
diff --git a/segmind/client.py b/segmind/client.py
index 77a4ced..e51904c 100644
--- a/segmind/client.py
+++ b/segmind/client.py
@@ -46,7 +46,12 @@ def _build_client(self) -> httpx.Client:
         headers = {
             # "Content-Type": "application/json",
             "User-Agent": "segmind-python-sdk/0.1.0",
-            "X-Initiator": "segmind-python-sdk/0.1.0",
+            # SEG-319: identifies SDK traffic in spotdb. Heimdall passes
+            # X-Initiator through verbatim on sync (-> "SDK-PY") and suffixes
+            # "-V2" on the v2-async path (-> "SDK-PY-V2"). Must match the
+            # InitiatorType enum in spot-backend or it's coerced to OTHERS.
+            # Version detail stays in User-Agent above.
+            "X-Initiator": "SDK-PY",
         }
         if self.api_key:
             headers["x-api-key"] = self.api_key
diff --git a/tests/test_client.py b/tests/test_client.py
index 9ff68f8..5894e8d 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -36,7 +36,9 @@ def test_http_client_headers(self, mock_api_key):
 
         assert http_client.headers["x-api-key"] == mock_api_key
         assert http_client.headers["User-Agent"] == "segmind-python-sdk/0.1.0"
-        assert http_client.headers["X-Initiator"] == "segmind-python-sdk/0.1.0"
+        # SEG-319: stable initiator token so spotdb can attribute SDK traffic
+        # (heimdall suffixes -V2 on the v2-async path -> "SDK-PY-V2").
+        assert http_client.headers["X-Initiator"] == "SDK-PY"
 
 
     def test_http_client_headers_without_api_key(self):
@@ -46,7 +48,7 @@ def test_http_client_headers_without_api_key(self):
 
         assert "x-api-key" not in http_client.headers
         assert http_client.headers["User-Agent"] == "segmind-python-sdk/0.1.0"
-        assert http_client.headers["X-Initiator"] == "segmind-python-sdk/0.1.0"
+        assert http_client.headers["X-Initiator"] == "SDK-PY"
 
 
     def test_http_client_timeout_configuration(self, mock_api_key):