diff --git a/src/components/usage/RequestEventsDetailsCard.tsx b/src/components/usage/RequestEventsDetailsCard.tsx
index d541750..5dcfb35 100644
--- a/src/components/usage/RequestEventsDetailsCard.tsx
+++ b/src/components/usage/RequestEventsDetailsCard.tsx
@@ -8,7 +8,7 @@ import { authFilesApi } from '@/services/api/authFiles';
 import type { GeminiKeyConfig, ProviderKeyConfig, OpenAIProviderConfig } from '@/types';
 import type { AuthFileItem } from '@/types/authFile';
 import type { CredentialInfo } from '@/types/sourceInfo';
-import { buildSourceInfoMap } from '@/utils/sourceResolver';
+import { buildSourceInfoMap, resolveSourceDisplay } from '@/utils/sourceResolver';
 import {
   collectUsageDetails,
   extractTotalTokens,
@@ -128,13 +128,9 @@ export function RequestEventsDetailsCard({
           authIndexRaw === null || authIndexRaw === undefined || authIndexRaw === ''
             ? '-'
             : String(authIndexRaw);
-        const normalizedAuthIndex = normalizeAuthIndex(authIndexRaw);
-        const sourceInfo = sourceInfoMap.get(sourceRaw);
-        const authInfo = normalizedAuthIndex ? authFileMap.get(normalizedAuthIndex) : undefined;
-        const source = sourceInfo?.displayName
-          || authInfo?.name
-          || (sourceRaw.startsWith('t:') ? sourceRaw.slice(2) : sourceRaw || '-');
-        const sourceType = sourceInfo?.type || authInfo?.type || '';
+        const sourceInfo = resolveSourceDisplay(sourceRaw, authIndexRaw, sourceInfoMap, authFileMap);
+        const source = sourceInfo.displayName;
+        const sourceType = sourceInfo.type;
         const model = String(detail.__modelName ?? '').trim() || '-';
         const inputTokens = Math.max(toNumber(detail.tokens?.input_tokens), 0);
         const outputTokens = Math.max(toNumber(detail.tokens?.output_tokens), 0);
diff --git a/src/pages/LogsPage.tsx b/src/pages/LogsPage.tsx
index 0ea004d..d19f930 100644
--- a/src/pages/LogsPage.tsx
+++ b/src/pages/LogsPage.tsx
@@ -28,7 +28,7 @@ import { copyToClipboard } from '@/utils/clipboard';
 import { downloadBlob } from '@/utils/download';
 import { MANAGEMENT_API_PREFIX } from '@/utils/constants';
 import { formatUnixTimestamp } from '@/utils/format';
-import { buildSourceInfoMap } from '@/utils/sourceResolver';
+import { buildSourceInfoMap, resolveSourceDisplay } from '@/utils/sourceResolver';
 import {
   collectUsageDetailsWithEndpoint,
   normalizeAuthIndex,
@@ -860,29 +860,8 @@ export function LogsPage() {
     return scored.slice(0, 8);
   }, [traceLogLine, traceUsageDetails]);
   const resolveTraceSourceInfo = useCallback(
-    (sourceRaw: string, authIndex: unknown): SourceInfo => {
-      const source = sourceRaw.trim();
-      const matchedSource = traceSourceInfoMap.get(source);
-      if (matchedSource) {
-        return matchedSource;
-      }
-
-      const authIndexKey = normalizeAuthIndex(authIndex);
-      if (authIndexKey) {
-        const authInfo = traceAuthFileMap.get(authIndexKey);
-        if (authInfo) {
-          return {
-            displayName: authInfo.name || authIndexKey,
-            type: authInfo.type
-          };
-        }
-      }
-
-      return {
-        displayName: source.startsWith('t:') ? source.slice(2) : source || '-',
-        type: ''
-      };
-    },
+    (sourceRaw: string, authIndex: unknown): SourceInfo =>
+      resolveSourceDisplay(sourceRaw, authIndex, traceSourceInfoMap, traceAuthFileMap),
     [traceAuthFileMap, traceSourceInfoMap]
   );
 
diff --git a/src/utils/sourceResolver.ts b/src/utils/sourceResolver.ts
index e593815..040b70c 100644
--- a/src/utils/sourceResolver.ts
+++ b/src/utils/sourceResolver.ts
@@ -1,6 +1,6 @@
 import type { GeminiKeyConfig, OpenAIProviderConfig, ProviderKeyConfig } from '@/types';
-import type { SourceInfo } from '@/types/sourceInfo';
-import { buildCandidateUsageSourceIds } from '@/utils/usage';
+import type { CredentialInfo, SourceInfo } from '@/types/sourceInfo';
+import { buildCandidateUsageSourceIds, normalizeAuthIndex } from '@/utils/usage';
 
 export interface SourceInfoMapInput {
   geminiApiKeys?: GeminiKeyConfig[];
@@ -57,3 +57,27 @@ export function buildSourceInfoMap(input: SourceInfoMapInput): Map<string, Sourc
 
   return map;
 }
+
+export function resolveSourceDisplay(
+  sourceRaw: string,
+  authIndex: unknown,
+  sourceInfoMap: Map<string, SourceInfo>,
+  authFileMap: Map<string, CredentialInfo>
+): SourceInfo {
+  const source = sourceRaw.trim();
+  const matched = sourceInfoMap.get(source);
+  if (matched) return matched;
+
+  const authIndexKey = normalizeAuthIndex(authIndex);
+  if (authIndexKey) {
+    const authInfo = authFileMap.get(authIndexKey);
+    if (authInfo) {
+      return { displayName: authInfo.name || authIndexKey, type: authInfo.type };
+    }
+  }
+
+  return {
+    displayName: source.startsWith('t:') ? source.slice(2) : source || '-',
+    type: '',
+  };
+}