diff --git a/ctfcli/core/challenge.py b/ctfcli/core/challenge.py
index 77a9f22..49901ac 100644
--- a/ctfcli/core/challenge.py
+++ b/ctfcli/core/challenge.py
@@ -406,7 +406,7 @@ def _create_hints(self):
                 hint_payload = {
                     "content": hint["content"],
                     "title": hint.get("title", ""),
-                    "cost": hint["cost"],
+                    "cost": hint.get("cost", 0),
                     "challenge_id": self.challenge_id,
                 }