diff --git a/application/api/user/conversations/routes.py b/application/api/user/conversations/routes.py
index 5e474538..d690dcec 100644
--- a/application/api/user/conversations/routes.py
+++ b/application/api/user/conversations/routes.py
@@ -11,6 +11,7 @@ from application.api.answer.services.conversation_service import (
     TERMINATED_RESPONSE_PLACEHOLDER,
 )
 from application.storage.db.base_repository import looks_like_uuid, row_to_dict
+from application.storage.db.repositories.agents import AgentsRepository
 from application.storage.db.repositories.attachments import AttachmentsRepository
 from application.storage.db.repositories.conversations import ConversationsRepository
 from application.storage.db.repositories.message_events import MessageEventsRepository
@@ -357,10 +358,20 @@ class SubmitFeedback(Resource):
         description="Submit feedback for a conversation",
     )
     def post(self):
+        data = request.get_json() or {}
         decoded_token = request.decoded_token
+        # api_key callers (widgets) carry no JWT; resolve the key to its owner.
+        scoped_api_key = None
         if not decoded_token:
-            return make_response(jsonify({"success": False}), 401)
-        data = request.get_json()
+            api_key = data.get("api_key")
+            agent = None
+            if api_key:
+                with db_readonly() as conn:
+                    agent = AgentsRepository(conn).find_by_key(api_key)
+            if not agent:
+                return make_response(jsonify({"success": False}), 401)
+            decoded_token = {"sub": agent.get("user_id")}
+            scoped_api_key = api_key
         required_fields = ["feedback", "conversation_id", "question_index"]
         missing_fields = check_required_fields(data, required_fields)
         if missing_fields:
@@ -387,7 +398,10 @@ class SubmitFeedback(Resource):
             with db_session() as conn:
                 repo = ConversationsRepository(conn)
                 conv = repo.get_any(data["conversation_id"], user_id)
-                if conv is None:
+                # A key may only rate conversations it created.
+                if conv is None or (
+                    scoped_api_key and conv.get("api_key") != scoped_api_key
+                ):
                     return make_response(
                         jsonify({"success": False, "message": "Not found"}), 404
                     )
diff --git a/tests/api/user/test_conversations.py b/tests/api/user/test_conversations.py
index 8667f6eb..32506df4 100644
--- a/tests/api/user/test_conversations.py
+++ b/tests/api/user/test_conversations.py
@@ -769,3 +769,88 @@ class TestSubmitFeedbackHappy:
             response = SubmitFeedback().post()
 
         assert response.status_code == 400
+
+
+@pytest.mark.unit
+class TestSubmitFeedbackWithApiKey:
+    """api_key callers carry no JWT."""
+
+    def _seed_agent_with_key(self, pg_conn, owner, key):
+        from application.storage.db.repositories.agents import AgentsRepository
+
+        return AgentsRepository(pg_conn).create(owner, "widget", "published", key=key)
+
+    def _post(self, app, pg_conn, payload):
+        from application.api.user.conversations.routes import SubmitFeedback
+
+        with _patch_conversations_db(pg_conn), app.test_request_context("/api/feedback", method="POST", json=payload):
+            from flask import request
+
+            request.decoded_token = None
+            return SubmitFeedback().post()
+
+    def test_valid_key_rates_its_own_conversation(self, app, pg_conn):
+        from application.storage.db.repositories.conversations import (
+            ConversationsRepository,
+        )
+
+        owner, key = "owner-fb-key", "agent-key-ok"
+        self._seed_agent_with_key(pg_conn, owner, key)
+        repo = ConversationsRepository(pg_conn)
+        conv_id = str(repo.create(owner, name="via widget", api_key=key)["id"])
+        repo.append_message(conv_id, {"prompt": "p", "response": "r"})
+
+        response = self._post(
+            app,
+            pg_conn,
+            {
+                "feedback": "LIKE",
+                "question_index": 0,
+                "conversation_id": conv_id,
+                "api_key": key,
+            },
+        )
+
+        assert response.status_code == 200
+        fb = repo.get_messages(conv_id)[0].get("feedback")
+        assert fb and fb.get("text") == "like"
+
+    def test_key_cannot_rate_owner_conversation_it_did_not_create(self, app, pg_conn):
+        from application.storage.db.repositories.conversations import (
+            ConversationsRepository,
+        )
+
+        owner, key = "owner-fb-scope", "agent-key-scope"
+        self._seed_agent_with_key(pg_conn, owner, key)
+        # Owner's conversation, not created with the key.
+        conv_id = _seed_conversation(pg_conn, owner, name="owner private")
+        ConversationsRepository(pg_conn).append_message(conv_id, {"prompt": "p", "response": "r"})
+
+        response = self._post(
+            app,
+            pg_conn,
+            {
+                "feedback": "LIKE",
+                "question_index": 0,
+                "conversation_id": conv_id,
+                "api_key": key,
+            },
+        )
+
+        assert response.status_code == 404
+
+    def test_unknown_key_is_unauthorized(self, app, pg_conn):
+        conv_id = _seed_conversation(pg_conn, "owner-fb-bad")
+
+        response = self._post(
+            app,
+            pg_conn,
+            {
+                "feedback": "LIKE",
+                "question_index": 0,
+                "conversation_id": conv_id,
+                "api_key": "no-such-key",
+            },
+        )
+
+        assert response.status_code == 401