diff --git a/b/cntoai/model_usage_admin_report.dspy b/b/cntoai/model_usage_admin_report.dspy
index bf0e068..5a6355e 100644
--- a/b/cntoai/model_usage_admin_report.dspy
+++ b/b/cntoai/model_usage_admin_report.dspy
@@ -103,6 +103,30 @@ def _group_key(dt, group_by):
     return dt.strftime('%Y-%m-%d')
 
 
+def _round_amount(value):
+    return round(float(value or 0), 8)
+
+
+def _format_amount(value):
+    return '%.8f' % _round_amount(value)
+
+
+def _format_amount_item(item):
+    formatted = dict(item)
+    formatted['amount'] = _format_amount(formatted.get('amount'))
+    return formatted
+
+
+def _format_amount_items(items):
+    return [_format_amount_item(item) for item in items]
+
+
+def _format_amount_summary(summary):
+    formatted = dict(summary)
+    formatted['amount'] = _format_amount(formatted.get('amount'))
+    return formatted
+
+
 def _normalize_usage_row(row, bill_amount_map=None):
     usage = _parse_usage_content(row.get('usage_content'))
     orderid = row.get('orderid')
@@ -118,7 +142,7 @@ def _normalize_usage_row(row, bill_amount_map=None):
         'prompt_tokens': int(usage.get('prompt_tokens') or 0),
         'completion_tokens': int(usage.get('completion_tokens') or 0),
         'total_tokens': int(usage.get('total_tokens') or 0),
-        'amount': round(amount, 8),
+        'amount': _round_amount(amount),
         'bill_status': row.get('bill_status'),
         'orderid': orderid,
         'usage_time': row.get('created_at'),
@@ -303,7 +327,7 @@ def _aggregate_admin_summary(items, user_map, org_map):
         bucket['prompt_tokens'] += item.get('prompt_tokens') or 0
         bucket['completion_tokens'] += item.get('completion_tokens') or 0
         bucket['total_tokens'] += item.get('total_tokens') or 0
-        bucket['amount'] = round(bucket['amount'] + float(item.get('amount') or 0), 8)
+        bucket['amount'] = _round_amount(bucket['amount'] + float(item.get('amount') or 0))
         bucket['request_count'] += 1
         usage_time = item.get('usage_time')
         if usage_time:
@@ -350,7 +374,7 @@ def _aggregate_items(items, group_by=None):
         bucket['prompt_tokens'] += item.get('prompt_tokens') or 0
         bucket['completion_tokens'] += item.get('completion_tokens') or 0
         bucket['total_tokens'] += item.get('total_tokens') or 0
-        bucket['amount'] = round(bucket['amount'] + float(item.get('amount') or 0), 8)
+        bucket['amount'] = _round_amount(bucket['amount'] + float(item.get('amount') or 0))
         bucket['request_count'] += 1
 
     return sorted(buckets.values(), key=lambda x: x['period'], reverse=True)
@@ -362,7 +386,7 @@ def _summarize(items):
         'prompt_tokens': sum(i.get('prompt_tokens') or 0 for i in items),
         'completion_tokens': sum(i.get('completion_tokens') or 0 for i in items),
         'total_tokens': sum(i.get('total_tokens') or 0 for i in items),
-        'amount': round(sum(float(i.get('amount') or 0) for i in items), 8),
+        'amount': _round_amount(sum(float(i.get('amount') or 0) for i in items)),
     }
 
 
@@ -429,9 +453,9 @@ async def model_usage_user_report(ns={}):
                         'userid': userid,
                         'start_time': _format_datetime(start_dt),
                         'end_time': _format_datetime(end_dt),
-                        'summary': _summarize(all_items),
+                        'summary': _format_amount_summary(_summarize(all_items)),
                         'group_by': group_by,
-                        'groups': grouped,
+                        'groups': _format_amount_items(grouped),
                     },
                 }
 
@@ -449,11 +473,11 @@ async def model_usage_user_report(ns={}):
                     'userid': userid,
                     'start_time': _format_datetime(start_dt),
                     'end_time': _format_datetime(end_dt),
-                    'summary': _summarize(all_items),
+                    'summary': _format_amount_summary(_summarize(all_items)),
                     'total_count': total_count,
                     'current_page': current_page,
                     'page_size': page_size,
-                    'items': items,
+                    'items': _format_amount_items(items),
                 },
             }
         except Exception as e:
@@ -519,7 +543,7 @@ async def model_usage_admin_report(ns={}):
                     'orgid': orgid,
                     'start_time': _format_datetime(start_dt),
                     'end_time': _format_datetime(end_dt),
-                    'summary': _summarize([]),
+                    'summary': _format_amount_summary(_summarize([])),
                     'total_count': 0,
                     'current_page': current_page,
                     'page_size': page_size,
@@ -530,7 +554,7 @@ async def model_usage_admin_report(ns={}):
                         'orgid': orgid,
                         'start_time': _format_datetime(start_dt),
                         'end_time': _format_datetime(end_dt),
-                        'summary': _summarize([]),
+                        'summary': _format_amount_summary(_summarize([])),
                         'group_by': group_by,
                         'groups': [],
                     }
@@ -564,9 +588,9 @@ async def model_usage_admin_report(ns={}):
                         'orgid': orgid,
                         'start_time': _format_datetime(start_dt),
                         'end_time': _format_datetime(end_dt),
-                        'summary': _summarize(all_items),
+                        'summary': _format_amount_summary(_summarize(all_items)),
                         'group_by': group_by,
-                        'groups': grouped,
+                        'groups': _format_amount_items(grouped),
                     },
                 }
 
@@ -581,11 +605,11 @@ async def model_usage_admin_report(ns={}):
                     'orgid': orgid,
                     'start_time': _format_datetime(start_dt),
                     'end_time': _format_datetime(end_dt),
-                    'summary': _summarize(all_items),
+                    'summary': _format_amount_summary(_summarize(all_items)),
                     'total_count': total_count,
                     'current_page': current_page,
                     'page_size': page_size,
-                    'items': page_items,
+                    'items': _format_amount_items(page_items),
                 },
             }
         except Exception as e: