diff --git a/src/ogx_client/_client.py b/src/ogx_client/_client.py
index 67638be5..d754e2e7 100644
--- a/src/ogx_client/_client.py
+++ b/src/ogx_client/_client.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import os
+import json
 from typing import TYPE_CHECKING, Any, Mapping
 from typing_extensions import Self, override
 
@@ -112,6 +113,7 @@ def __init__(
         # outlining your use-case to help us decide if it should be
         # part of our public interface in the future.
         _strict_response_validation: bool = False,
+        provider_data: Mapping[str, Any] | None = None,
     ) -> None:
         """Construct a new synchronous OgxClient client instance.
 
@@ -135,6 +137,12 @@ def __init__(
                     parsed[line[:colon].strip()] = line[colon + 1 :].strip()
             default_headers = {**parsed, **(default_headers if is_mapping_t(default_headers) else {})}
 
+        if provider_data is not None:
+            default_headers = {
+                **(default_headers if is_mapping_t(default_headers) else {}),
+                "X-OGX-Provider-Data": json.dumps(provider_data),
+            }
+
         super().__init__(
             version=__version__,
             base_url=base_url,
@@ -436,6 +444,7 @@ def __init__(
         # outlining your use-case to help us decide if it should be
         # part of our public interface in the future.
         _strict_response_validation: bool = False,
+        provider_data: Mapping[str, Any] | None = None,
     ) -> None:
         """Construct a new async AsyncOgxClient client instance.
 
@@ -459,6 +468,12 @@ def __init__(
                     parsed[line[:colon].strip()] = line[colon + 1 :].strip()
             default_headers = {**parsed, **(default_headers if is_mapping_t(default_headers) else {})}
 
+        if provider_data is not None:
+            default_headers = {
+                **(default_headers if is_mapping_t(default_headers) else {}),
+                "X-OGX-Provider-Data": json.dumps(provider_data),
+            }
+
         super().__init__(
             version=__version__,
             base_url=base_url,