1 files changed, 7 insertions, 1 deletions
diff --git a/openbb_platform/core/openbb_core/provider/standard_models/tmc.py b/openbb_platform/core/openbb_core/provider/standard_models/tmc.py
index 8e5177ecd7b..7ccb66d8d03 100644
--- a/openbb_platform/core/openbb_core/provider/standard_models/tmc.py
+++ b/openbb_platform/core/openbb_core/provider/standard_models/tmc.py
@@ -5,7 +5,7 @@ from datetime import (
 )
 from typing import Literal, Optional
 
-from pydantic import Field
+from pydantic import Field, field_validator
 
 from openbb_core.provider.abstract.data import Data
 from openbb_core.provider.abstract.query_params import QueryParams
@@ -31,6 +31,12 @@ class TreasuryConstantMaturityQueryParams(QueryParams):
         description="The maturity",
     )
 
+    @field_validator("maturity", mode="before", check_fields=False)
+    @classmethod
+    def to_lower(cls, v: Optional[str]) -> Optional[str]:
+        """Convert field to lowercase."""
+        return v.lower() if v else v
+
 
 class TreasuryConstantMaturityData(Data):
     """Treasury Constant Maturity Data."""