diff --git a/python/svix/api.py b/python/svix/api.py
index 006ce1509..a4e3e4d84 100644
--- a/python/svix/api.py
+++ b/python/svix/api.py
@@ -1162,6 +1162,37 @@ def expunge_content(self, app_id: str, msg_id: str) -> None:
         )
 
 
+def message_in_raw(
+    event_type: str, payload: str, content_type: t.Optional[str] = None
+) -> MessageIn:
+    """
+    Creates a `MessageIn` with the payload already being serialized.
+
+    The payload is not normalized on the server. Normally, payloads are required
+    to be JSON, and Svix will minify the payload before sending the webhook
+    (for example, by removing extraneous whitespace or unnecessarily escaped
+    characters in strings). With this function, the payload will be sent
+    "as is", without any minification or other processing.
+
+    Args:
+        event_type (str): The event type's name Example: `user.signup`.
+        payload (str): Serialized message payload.
+        content_type (str?): The `content-type` header value Svix uses for
+            the webhook request. If not specified, `application/json` is used.
+    """
+    transformations_params: t.Dict[str, t.Any] = {
+        "rawPayload": payload,
+    }
+    if content_type is not None:
+        transformations_params["headers"] = {"content-type": content_type}
+
+    return MessageIn(
+        event_type=event_type,
+        payload={},
+        transformations_params=transformations_params,
+    )
+
+
 class MessageAttemptAsync(ApiBase):
     async def list_by_msg(
         self,