diff --git a/src/server/routes/api/oauth.test.ts b/src/server/routes/api/oauth.test.ts
index fd27f9d..124d6c2 100644
--- a/src/server/routes/api/oauth.test.ts
+++ b/src/server/routes/api/oauth.test.ts
@@ -812,6 +812,31 @@ describe('oauth routes', { timeout: 15_000 }, () => {
           accountId: 'chatgpt-account-123',
           email: 'codex-user@example.com',
           planType: 'team',
+          idToken: buildJwt({
+            email: 'codex-user@example.com',
+            'https://api.openai.com/auth': {
+              chatgpt_account_id: 'chatgpt-account-123',
+              chatgpt_plan_type: 'team',
+              chatgpt_subscription_active_start: '2026-03-01T00:00:00.000Z',
+              chatgpt_subscription_active_until: '2026-04-01T00:00:00.000Z',
+            },
+          }),
+          quota: {
+            status: 'supported',
+            source: 'reverse_engineered',
+            lastSyncAt: '2026-03-17T08:00:00.000Z',
+            lastLimitResetAt: '2026-03-17T13:00:00.000Z',
+            windows: {
+              fiveHour: {
+                supported: false,
+                message: 'official 5h quota window is not exposed by current codex oauth artifacts',
+              },
+              sevenDay: {
+                supported: false,
+                message: 'official 7d quota window is not exposed by current codex oauth artifacts',
+              },
+            },
+          },
           modelDiscoveryStatus: 'abnormal',
           lastModelSyncAt: '2026-03-17T08:00:00.000Z',
           lastModelSyncError: 'Codex 模型获取失败（HTTP 403: forbidden）',
@@ -853,6 +878,16 @@ describe('oauth routes', { timeout: 15_000 }, () => {
           provider: 'codex',
           email: 'codex-user@example.com',
           status: 'abnormal',
+          quota: expect.objectContaining({
+            status: 'supported',
+            source: 'reverse_engineered',
+            lastLimitResetAt: '2026-03-17T13:00:00.000Z',
+            subscription: expect.objectContaining({
+              planType: 'team',
+              activeStart: '2026-03-01T00:00:00.000Z',
+              activeUntil: '2026-04-01T00:00:00.000Z',
+            }),
+          }),
           routeChannelCount: 1,
           lastModelSyncAt: '2026-03-17T08:00:00.000Z',
           lastModelSyncError: 'Codex 模型获取失败（HTTP 403: forbidden）',
@@ -874,6 +909,96 @@ describe('oauth routes', { timeout: 15_000 }, () => {
     expect(accounts).toEqual([]);
   });
 
+  it('refreshes oauth quota snapshots and marks unsupported providers explicitly', async () => {
+    const codexSite = await db.insert(schema.sites).values({
+      name: 'ChatGPT Codex OAuth',
+      url: 'https://chatgpt.com/backend-api/codex',
+      platform: 'codex',
+      status: 'active',
+    }).returning().get();
+    const antigravitySite = await db.insert(schema.sites).values({
+      name: 'Antigravity OAuth',
+      url: 'https://example.com/antigravity',
+      platform: 'antigravity',
+      status: 'active',
+    }).returning().get();
+
+    const codexAccount = await db.insert(schema.accounts).values({
+      siteId: codexSite.id,
+      username: 'codex-user@example.com',
+      accessToken: 'oauth-access-token',
+      status: 'active',
+      oauthProvider: 'codex',
+      oauthAccountKey: 'chatgpt-account-123',
+      extraConfig: JSON.stringify({
+        credentialMode: 'session',
+        oauth: {
+          provider: 'codex',
+          accountId: 'chatgpt-account-123',
+          email: 'codex-user@example.com',
+          planType: 'plus',
+          idToken: buildJwt({
+            email: 'codex-user@example.com',
+            'https://api.openai.com/auth': {
+              chatgpt_account_id: 'chatgpt-account-123',
+              chatgpt_plan_type: 'plus',
+              chatgpt_subscription_active_start: '2026-03-01T00:00:00.000Z',
+              chatgpt_subscription_active_until: '2026-04-01T00:00:00.000Z',
+            },
+          }),
+        },
+      }),
+    }).returning().get();
+
+    const antigravityAccount = await db.insert(schema.accounts).values({
+      siteId: antigravitySite.id,
+      username: 'ag-user@example.com',
+      accessToken: 'oauth-access-token',
+      status: 'active',
+      oauthProvider: 'antigravity',
+      oauthAccountKey: 'ag-account-123',
+      extraConfig: JSON.stringify({
+        credentialMode: 'session',
+        oauth: {
+          provider: 'antigravity',
+          accountId: 'ag-account-123',
+          email: 'ag-user@example.com',
+          planType: 'pro',
+        },
+      }),
+    }).returning().get();
+
+    const codexRefresh = await app.inject({
+      method: 'POST',
+      url: `/api/oauth/connections/${codexAccount.id}/quota/refresh`,
+    });
+    expect(codexRefresh.statusCode).toBe(200);
+    expect(codexRefresh.json()).toMatchObject({
+      success: true,
+      quota: expect.objectContaining({
+        status: 'supported',
+        subscription: expect.objectContaining({
+          planType: 'plus',
+          activeStart: '2026-03-01T00:00:00.000Z',
+          activeUntil: '2026-04-01T00:00:00.000Z',
+        }),
+      }),
+    });
+
+    const antigravityRefresh = await app.inject({
+      method: 'POST',
+      url: `/api/oauth/connections/${antigravityAccount.id}/quota/refresh`,
+    });
+    expect(antigravityRefresh.statusCode).toBe(200);
+    expect(antigravityRefresh.json()).toMatchObject({
+      success: true,
+      quota: expect.objectContaining({
+        status: 'unsupported',
+        providerMessage: 'current local CLIProxyAPI evidence does not expose official quota windows for antigravity oauth',
+      }),
+    });
+  });
+
   it('keeps multiple codex team workspaces with the same email as separate oauth connections', async () => {
     const buildTokenExchange = (accountId: string) => ({
       ok: true,
diff --git a/src/server/routes/api/oauth.ts b/src/server/routes/api/oauth.ts
index 5eb942e..32976eb 100644
--- a/src/server/routes/api/oauth.ts
+++ b/src/server/routes/api/oauth.ts
@@ -6,6 +6,7 @@ import {
   handleOauthCallback,
   listOauthConnections,
   listOauthProviders,
+  refreshOauthConnectionQuota,
   startOauthProviderFlow,
   startOauthRebindFlow,
   submitOauthManualCallback,
@@ -234,6 +235,22 @@ export async function oauthRoutes(app: FastifyInstance) {
     },
   );
 
+  app.post<{ Params: { accountId: string } }>(
+    '/api/oauth/connections/:accountId/quota/refresh',
+    { preHandler: [limitOauthConnectionMutate] },
+    async (request, reply) => {
+      const accountId = parsePositiveInteger(request.params.accountId);
+      if (accountId === null) {
+        return reply.code(400).send({ message: 'invalid account id' });
+      }
+      try {
+        return await refreshOauthConnectionQuota(accountId);
+      } catch (error: any) {
+        return reply.code(404).send({ message: error?.message || 'oauth account not found' });
+      }
+    },
+  );
+
   app.get<{ Params: { provider: string }; Querystring: { state?: string; code?: string; error?: string } }>(
     '/api/oauth/callback/:provider',
     { preHandler: [limitOauthCallback] },
diff --git a/src/server/services/backupService.test.ts b/src/server/services/backupService.test.ts
index fc0f07f..95ec12d 100644
--- a/src/server/services/backupService.test.ts
+++ b/src/server/services/backupService.test.ts
@@ -68,6 +68,9 @@ describe('backupService', () => {
       username: 'roundtrip-user',
       accessToken: 'session-token',
       apiToken: 'api-token',
+      oauthProvider: 'codex',
+      oauthAccountKey: 'roundtrip-account-key',
+      oauthProjectId: 'roundtrip-project-id',
       balance: 12.3,
       balanceUsed: 4.5,
       quota: 99.9,
@@ -141,6 +144,9 @@ describe('backupService', () => {
 
     expect(restoredAccount?.isPinned).toBe(true);
     expect(restoredAccount?.sortOrder).toBe(7);
+    expect(restoredAccount?.oauthProvider).toBe('codex');
+    expect(restoredAccount?.oauthAccountKey).toBe('roundtrip-account-key');
+    expect(restoredAccount?.oauthProjectId).toBe('roundtrip-project-id');
 
     expect(restoredRoute?.displayName).toBe('gpt-route');
     expect(restoredRoute?.displayIcon).toBe('icon-gpt');
@@ -203,4 +209,80 @@ describe('backupService', () => {
     expect(accounts[0].username).toBe('legacy-user');
     expect(settings.some((row) => row.key === 'legacy_preferences_ref_v2')).toBe(true);
   });
+
+  it('backfills oauth columns from extraConfig when importing older backups', async () => {
+    const payload = {
+      timestamp: Date.now(),
+      accounts: {
+        sites: [
+          {
+            id: 1,
+            name: 'codex-site',
+            url: 'https://codex.example.com',
+            platform: 'chatgpt-account',
+            proxyUrl: null,
+            status: 'active',
+            isPinned: false,
+            sortOrder: 0,
+            apiKey: null,
+            createdAt: '2026-03-01T00:00:00.000Z',
+            updatedAt: '2026-03-01T00:00:00.000Z',
+            externalCheckinUrl: null,
+            useSystemProxy: false,
+            globalWeight: 1,
+            customHeaders: null,
+          },
+        ],
+        accounts: [
+          {
+            id: 10,
+            siteId: 1,
+            username: 'oauth-user',
+            accessToken: 'oauth-access-token',
+            apiToken: null,
+            balance: 0,
+            balanceUsed: 0,
+            quota: 0,
+            unitCost: null,
+            valueScore: 0,
+            status: 'active',
+            isPinned: false,
+            sortOrder: 0,
+            checkinEnabled: true,
+            lastCheckinAt: null,
+            lastBalanceRefresh: null,
+            extraConfig: JSON.stringify({
+              credentialMode: 'session',
+              oauth: {
+                provider: 'gemini-cli',
+                accountId: 'oauth-user@example.com',
+                accountKey: 'oauth-user@example.com',
+                projectId: 'oauth-project-id',
+                refreshToken: 'oauth-refresh-token',
+              },
+            }),
+            createdAt: '2026-03-01T00:00:00.000Z',
+            updatedAt: '2026-03-01T00:00:00.000Z',
+            oauthProvider: null,
+            oauthAccountKey: null,
+            oauthProjectId: null,
+          },
+        ],
+        accountTokens: [],
+        tokenRoutes: [],
+        routeChannels: [],
+      },
+    } as Record<string, unknown>;
+
+    const result = await backupService.importBackup(payload);
+
+    expect(result.allImported).toBe(true);
+    expect(result.sections.accounts).toBe(true);
+
+    const restoredAccount = await db.select().from(schema.accounts).where(eq(schema.accounts.id, 10)).get();
+
+    expect(restoredAccount?.oauthProvider).toBe('gemini-cli');
+    expect(restoredAccount?.oauthAccountKey).toBe('oauth-user@example.com');
+    expect(restoredAccount?.oauthProjectId).toBe('oauth-project-id');
+  });
 });
diff --git a/src/server/services/backupService.ts b/src/server/services/backupService.ts
index 09f5b75..5e23fec 100644
--- a/src/server/services/backupService.ts
+++ b/src/server/services/backupService.ts
@@ -2,6 +2,7 @@ import { asc } from 'drizzle-orm';
 import cron from 'node-cron';
 import { db, schema } from '../db/index.js';
 import { upsertSetting } from '../db/upsertSetting.js';
+import { getOauthInfoFromExtraConfig } from './oauth/oauthAccount.js';
 
 const BACKUP_VERSION = '2.0';
 
@@ -104,6 +105,18 @@ function normalizeLegacyQuota(raw: unknown): number {
   return value;
 }
 
+function resolveImportedOauthColumns(row: Pick<AccountRow, 'oauthProvider' | 'oauthAccountKey' | 'oauthProjectId' | 'extraConfig'>) {
+  const oauth = getOauthInfoFromExtraConfig(row.extraConfig);
+  const oauthProvider = row.oauthProvider || oauth?.provider || null;
+  const oauthAccountKey = row.oauthAccountKey || oauth?.accountKey || oauth?.accountId || null;
+  const oauthProjectId = row.oauthProjectId || oauth?.projectId || null;
+  return {
+    oauthProvider,
+    oauthAccountKey,
+    oauthProjectId,
+  };
+}
+
 function normalizeLegacyPlatform(raw: string): string {
   const value = raw.trim().toLowerCase();
   if (!value) return 'new-api';
@@ -494,12 +507,16 @@ async function importAccountsSection(section: AccountsBackupSection): Promise<vo
     }
 
     for (const row of section.accounts) {
+      const oauthColumns = resolveImportedOauthColumns(row);
       await tx.insert(schema.accounts).values({
         id: row.id,
         siteId: row.siteId,
         username: row.username,
         accessToken: row.accessToken,
         apiToken: row.apiToken,
+        oauthProvider: oauthColumns.oauthProvider,
+        oauthAccountKey: oauthColumns.oauthAccountKey,
+        oauthProjectId: oauthColumns.oauthProjectId,
         balance: row.balance,
         balanceUsed: row.balanceUsed,
         quota: row.quota,
diff --git a/src/server/services/oauth/oauthAccount.ts b/src/server/services/oauth/oauthAccount.ts
index 58c570a..4a99753 100644
--- a/src/server/services/oauth/oauthAccount.ts
+++ b/src/server/services/oauth/oauthAccount.ts
@@ -1,4 +1,5 @@
 import { schema } from '../../db/index.js';
+import type { OauthQuotaSnapshot } from './quotaTypes.js';
 
 type ParsedOauthInfo = {
   provider?: unknown;
@@ -11,6 +12,7 @@ type ParsedOauthInfo = {
   refreshToken?: unknown;
   idToken?: unknown;
   providerData?: unknown;
+  quota?: unknown;
   modelDiscoveryStatus?: unknown;
   lastModelSyncAt?: unknown;
   lastModelSyncError?: unknown;
@@ -34,6 +36,7 @@ export type OauthInfo = {
   refreshToken?: string;
   idToken?: string;
   providerData?: Record<string, unknown>;
+  quota?: OauthQuotaSnapshot;
   modelDiscoveryStatus?: OauthModelDiscoveryStatus;
   lastModelSyncAt?: string;
   lastModelSyncError?: string;
@@ -88,6 +91,11 @@ function asRecord(value: unknown): Record<string, unknown> | undefined {
   return value as Record<string, unknown>;
 }
 
+function asQuotaSnapshot(value: unknown): OauthQuotaSnapshot | undefined {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) return undefined;
+  return value as OauthQuotaSnapshot;
+}
+
 function asModelDiscoveryStatus(value: unknown): OauthModelDiscoveryStatus | undefined {
   if (typeof value !== 'string') return undefined;
   const normalized = value.trim().toLowerCase();
@@ -113,6 +121,7 @@ export function getOauthInfoFromExtraConfig(extraConfig?: string | null): OauthI
     refreshToken: asTrimmedString(parsed.refreshToken),
     idToken: asTrimmedString(parsed.idToken),
     providerData: asRecord(parsed.providerData),
+    quota: asQuotaSnapshot(parsed.quota),
     modelDiscoveryStatus: asModelDiscoveryStatus(parsed.modelDiscoveryStatus),
     lastModelSyncAt: asIsoDateTime(parsed.lastModelSyncAt),
     lastModelSyncError: asTrimmedString(parsed.lastModelSyncError),
diff --git a/src/server/services/oauth/service.ts b/src/server/services/oauth/service.ts
index 41f0e77..9a73d70 100644
--- a/src/server/services/oauth/service.ts
+++ b/src/server/services/oauth/service.ts
@@ -16,6 +16,7 @@ import {
 } from './providers.js';
 import { buildOauthInfo, getOauthInfoFromExtraConfig } from './oauthAccount.js';
 import { buildCodexOauthInfo } from './codexAccount.js';
+import { buildQuotaSnapshotFromOauthInfo, refreshOauthQuotaSnapshot } from './quota.js';
 
 type OAuthProviderMetadata = ReturnType<typeof listOauthProviders>[number];
 const MANUAL_CALLBACK_DELAY_MS = 15_000;
@@ -503,6 +504,7 @@ export async function listOauthConnections(options: {
       projectId: oauth.projectId,
       modelCount: models.length,
       modelsPreview: models.slice(0, 10),
+      quota: buildQuotaSnapshotFromOauthInfo(oauth),
       status,
       routeChannelCount: routeChannelCountByAccount.get(row.accounts.id) || 0,
       lastModelSyncAt: oauth.lastModelSyncAt,
@@ -535,6 +537,11 @@ export async function deleteOauthConnection(accountId: number) {
   return { success: true };
 }
 
+export async function refreshOauthConnectionQuota(accountId: number) {
+  const quota = await refreshOauthQuotaSnapshot(accountId);
+  return { success: true, quota };
+}
+
 export async function startOauthRebindFlow(accountId: number, requestOrigin?: string) {
   const account = await db.select().from(schema.accounts)
     .where(eq(schema.accounts.id, accountId))
diff --git a/src/web/api.ts b/src/web/api.ts
index 8c90f4d..fd39f2e 100644
--- a/src/web/api.ts
+++ b/src/web/api.ts
@@ -283,6 +283,33 @@ export type OAuthSessionInfo = {
   error?: string;
 };
 
+export type OAuthQuotaWindowInfo = {
+  supported: boolean;
+  limit?: number | null;
+  used?: number | null;
+  remaining?: number | null;
+  resetAt?: string | null;
+  message?: string | null;
+};
+
+export type OAuthQuotaInfo = {
+  status: 'supported' | 'unsupported' | 'error';
+  source: 'official' | 'reverse_engineered';
+  lastSyncAt?: string | null;
+  lastError?: string | null;
+  providerMessage?: string | null;
+  subscription?: {
+    planType?: string | null;
+    activeStart?: string | null;
+    activeUntil?: string | null;
+  } | null;
+  windows: {
+    fiveHour: OAuthQuotaWindowInfo;
+    sevenDay: OAuthQuotaWindowInfo;
+  };
+  lastLimitResetAt?: string | null;
+};
+
 export type OAuthConnectionInfo = {
   accountId: number;
   siteId: number;
@@ -295,6 +322,7 @@ export type OAuthConnectionInfo = {
   modelCount: number;
   modelsPreview: string[];
   status: 'healthy' | 'abnormal';
+  quota?: OAuthQuotaInfo | null;
   routeChannelCount?: number;
   lastModelSyncAt?: string | null;
   lastModelSyncError?: string | null;
@@ -432,6 +460,10 @@ export const api = {
   }) as Promise<{ success: true }>,
   getOAuthConnections: (params?: { limit?: number; offset?: number }) =>
     request(`/api/oauth/connections${buildQueryString(params)}`) as Promise<OAuthConnectionsResponse>,
+  refreshOAuthConnectionQuota: (accountId: number) => request(`/api/oauth/connections/${accountId}/quota/refresh`, {
+    method: 'POST',
+    body: JSON.stringify({}),
+  }) as Promise<{ success: true; quota: OAuthQuotaInfo }>,
   rebindOAuthConnection: (accountId: number) => request(`/api/oauth/connections/${accountId}/rebind`, {
     method: 'POST',
     body: JSON.stringify({}),
diff --git a/src/web/pages/OAuthManagement.test.tsx b/src/web/pages/OAuthManagement.test.tsx
index 296c65b..b3de514 100644
--- a/src/web/pages/OAuthManagement.test.tsx
+++ b/src/web/pages/OAuthManagement.test.tsx
@@ -11,6 +11,7 @@ const { apiMock, openMock, focusMock, confirmMock, promptMock } = vi.hoisted(()
     startOAuthProvider: vi.fn(),
     getOAuthSession: vi.fn(),
     submitOAuthManualCallback: vi.fn(),
+    refreshOAuthConnectionQuota: vi.fn(),
     rebindOAuthConnection: vi.fn(),
     deleteOAuthConnection: vi.fn(),
   },
@@ -684,6 +685,26 @@ describe('OAuthManagement page', () => {
             modelCount: 11,
             modelsPreview: ['gpt-5.4', 'gpt-5.3-codex', 'gpt-5.2-codex'],
             status: 'abnormal',
+            quota: {
+              status: 'supported',
+              source: 'reverse_engineered',
+              subscription: {
+                planType: 'team',
+                activeStart: '2026-03-01T00:00:00.000Z',
+                activeUntil: '2026-04-01T00:00:00.000Z',
+              },
+              lastLimitResetAt: '2026-03-17T13:00:00.000Z',
+              windows: {
+                fiveHour: {
+                  supported: false,
+                  message: 'official 5h quota window is not exposed by current codex oauth artifacts',
+                },
+                sevenDay: {
+                  supported: false,
+                  message: 'official 7d quota window is not exposed by current codex oauth artifacts',
+                },
+              },
+            },
             routeChannelCount: 1,
             lastModelSyncAt: '2026-03-17T08:00:00.000Z',
             lastModelSyncError: 'Codex 模型获取失败（HTTP 403: forbidden）',
@@ -713,6 +734,12 @@ describe('OAuthManagement page', () => {
         expect(text).toContain('异常');
         expect(text).toContain('1 条路由');
         expect(text).toContain('Codex 模型获取失败');
+        expect(text).toContain('额度状态');
+        expect(text).toContain('team');
+        expect(text).toContain('2026-03-01T00:00:00.000Z');
+        expect(text).toContain('2026-04-01T00:00:00.000Z');
+        expect(text).toContain('2026-03-17T13:00:00.000Z');
+        expect(text).toContain('官方未提供');
       });
 
       const deleteButton = root!.root.find((node) => (
@@ -735,4 +762,139 @@ describe('OAuthManagement page', () => {
       root?.unmount();
     }
   });
+
+  it('refreshes quota for a connection and reloads the connection list', async () => {
+    apiMock.getOAuthProviders.mockResolvedValue({
+      providers: [
+        {
+          provider: 'codex',
+          label: 'Codex',
+          platform: 'codex',
+          enabled: true,
+          loginType: 'oauth',
+          requiresProjectId: false,
+          supportsDirectAccountRouting: true,
+          supportsCloudValidation: true,
+          supportsNativeProxy: true,
+        },
+      ],
+    });
+    apiMock.getOAuthConnections
+      .mockResolvedValueOnce({
+        items: [
+          {
+            accountId: 7,
+            provider: 'codex',
+            email: 'codex-user@example.com',
+            planType: 'team',
+            modelCount: 11,
+            modelsPreview: ['gpt-5.4'],
+            status: 'healthy',
+            quota: {
+              status: 'supported',
+              source: 'reverse_engineered',
+              windows: {
+                fiveHour: {
+                  supported: false,
+                  message: 'official 5h quota window is not exposed by current codex oauth artifacts',
+                },
+                sevenDay: {
+                  supported: false,
+                  message: 'official 7d quota window is not exposed by current codex oauth artifacts',
+                },
+              },
+            },
+          },
+        ],
+        total: 1,
+        limit: 100,
+        offset: 0,
+      })
+      .mockResolvedValueOnce({
+        items: [
+          {
+            accountId: 7,
+            provider: 'codex',
+            email: 'codex-user@example.com',
+            planType: 'team',
+            modelCount: 11,
+            modelsPreview: ['gpt-5.4'],
+            status: 'healthy',
+            quota: {
+              status: 'supported',
+              source: 'reverse_engineered',
+              lastSyncAt: '2026-03-18T01:00:00.000Z',
+              windows: {
+                fiveHour: {
+                  supported: false,
+                  message: 'official 5h quota window is not exposed by current codex oauth artifacts',
+                },
+                sevenDay: {
+                  supported: false,
+                  message: 'official 7d quota window is not exposed by current codex oauth artifacts',
+                },
+              },
+            },
+          },
+        ],
+        total: 1,
+        limit: 100,
+        offset: 0,
+      });
+    apiMock.refreshOAuthConnectionQuota.mockResolvedValue({
+      success: true,
+      quota: {
+        status: 'supported',
+        source: 'reverse_engineered',
+        lastSyncAt: '2026-03-18T01:00:00.000Z',
+        windows: {
+          fiveHour: {
+            supported: false,
+            message: 'official 5h quota window is not exposed by current codex oauth artifacts',
+          },
+          sevenDay: {
+            supported: false,
+            message: 'official 7d quota window is not exposed by current codex oauth artifacts',
+          },
+        },
+      },
+    });
+
+    let root: ReturnType<typeof create> | null = null;
+    try {
+      await act(async () => {
+        root = create(
+          <ToastProvider>
+            <MemoryRouter>
+              <OAuthManagement />
+            </MemoryRouter>
+          </ToastProvider>,
+        );
+      });
+      await vi.waitFor(async () => {
+        await flushMicrotasks();
+        expect(collectText(root!.root)).toContain('刷新额度');
+      });
+
+      const refreshButton = root!.root.find((node) => (
+        node.type === 'button'
+        && typeof node.props.onClick === 'function'
+        && collectText(node).includes('刷新额度')
+      ));
+
+      await act(async () => {
+        await refreshButton.props.onClick();
+      });
+      await vi.waitFor(async () => {
+        await flushMicrotasks();
+      });
+
+      expect(apiMock.refreshOAuthConnectionQuota).toHaveBeenCalledWith(7);
+      expect(apiMock.getOAuthConnections).toHaveBeenCalledTimes(2);
+      expect(collectText(root!.root)).toContain('额度信息已刷新');
+      expect(collectText(root!.root)).toContain('2026-03-18T01:00:00.000Z');
+    } finally {
+      root?.unmount();
+    }
+  });
 });
diff --git a/src/web/pages/OAuthManagement.tsx b/src/web/pages/OAuthManagement.tsx
index 7fde182..16190a9 100644
--- a/src/web/pages/OAuthManagement.tsx
+++ b/src/web/pages/OAuthManagement.tsx
@@ -1,5 +1,12 @@
 import { useEffect, useState, type ReactNode } from 'react';
-import { api, type OAuthConnectionInfo, type OAuthProviderInfo, type OAuthStartInstructions } from '../api.js';
+import {
+  api,
+  type OAuthConnectionInfo,
+  type OAuthProviderInfo,
+  type OAuthQuotaInfo,
+  type OAuthQuotaWindowInfo,
+  type OAuthStartInstructions,
+} from '../api.js';
 
 const POLL_INTERVAL_MS = 1500;
 const CONNECTION_PAGE_LIMIT = 100;
@@ -57,6 +64,35 @@ function resolveConnectionEmailLabel(connection: OAuthConnectionInfo): string {
   return email;
 }
 
+function resolveQuotaStatusLabel(status?: OAuthQuotaInfo['status']): string {
+  if (status === 'unsupported') return '不支持';
+  if (status === 'error') return '获取失败';
+  return '支持';
+}
+
+function resolveQuotaSourceLabel(source?: OAuthQuotaInfo['source']): string {
+  return source === 'official' ? '官方' : '本地信号';
+}
+
+function resolveQuotaWindowSummary(window?: OAuthQuotaWindowInfo | null): string {
+  if (!window || !window.supported) return '官方未提供';
+
+  const parts: string[] = [];
+  if (typeof window.remaining === 'number') {
+    parts.push(`剩余 ${window.remaining}`);
+  }
+  if (typeof window.used === 'number' && typeof window.limit === 'number') {
+    parts.push(`已用 ${window.used} / ${window.limit}`);
+  } else if (typeof window.limit === 'number') {
+    parts.push(`总量 ${window.limit}`);
+  }
+  if (window.resetAt) {
+    parts.push(`重置 ${window.resetAt}`);
+  }
+
+  return parts.length > 0 ? parts.join(' · ') : '官方未提供';
+}
+
 function renderCodeBlock(value: string) {
   return (
     <code style={{
@@ -264,6 +300,20 @@ export default function OAuthManagement() {
     }
   };
 
+  const handleRefreshQuota = async (accountId: number) => {
+    const actionKey = `quota:${accountId}`;
+    setActionLoadingKey(actionKey);
+    try {
+      await api.refreshOAuthConnectionQuota(accountId);
+      setSessionMessage('额度信息已刷新');
+      await loadConnections();
+    } catch (error: any) {
+      setSessionMessage(error?.message || '刷新额度失败');
+    } finally {
+      setActionLoadingKey('');
+    }
+  };
+
   return (
     <div className="page-container">
       <div className="page-header">
@@ -416,9 +466,11 @@ export default function OAuthManagement() {
         <div style={{ display: 'grid', gap: 12 }}>
           {connections.map((connection) => {
             const rebindActionKey = `start:${connection.provider}:${connection.accountId}`;
+            const refreshQuotaActionKey = `quota:${connection.accountId}`;
             const deleteActionKey = `delete:${connection.accountId}`;
             const primaryTitle = resolveConnectionPrimaryTitle(connection);
             const emailLabel = resolveConnectionEmailLabel(connection);
+            const quota = connection.quota;
             return (
               <div key={connection.accountId} style={{ border: '1px solid var(--color-border)', borderRadius: 'var(--radius-md)', padding: 14 }}>
                 <div style={{ display: 'flex', alignItems: 'flex-start', justifyContent: 'space-between', gap: 12 }}>
@@ -460,8 +512,72 @@ export default function OAuthManagement() {
                         {connection.modelsPreview.join(', ')}
                       </div>
                     )}
+                    {quota && (
+                      <div style={{
+                        marginTop: 12,
+                        paddingTop: 12,
+                        borderTop: '1px dashed var(--color-border)',
+                        display: 'grid',
+                        gap: 6,
+                      }}
+                      >
+                        <div style={{ fontSize: 13, fontWeight: 600, color: 'var(--color-text-primary)' }}>额度状态</div>
+                        <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                          {resolveQuotaStatusLabel(quota.status)} · {resolveQuotaSourceLabel(quota.source)}
+                          {quota.lastSyncAt ? ` · 最近刷新: ${quota.lastSyncAt}` : ''}
+                        </div>
+                        {quota.subscription?.planType && (
+                          <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                            订阅类型: {quota.subscription.planType}
+                          </div>
+                        )}
+                        {quota.subscription?.activeStart && (
+                          <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                            订阅开始: {quota.subscription.activeStart}
+                          </div>
+                        )}
+                        {quota.subscription?.activeUntil && (
+                          <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                            订阅到期: {quota.subscription.activeUntil}
+                          </div>
+                        )}
+                        {quota.lastLimitResetAt && (
+                          <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                            最近重置提示: {quota.lastLimitResetAt}
+                          </div>
+                        )}
+                        <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                          5 小时窗口: {resolveQuotaWindowSummary(quota.windows?.fiveHour)}
+                        </div>
+                        <div style={{ fontSize: 12, color: 'var(--color-text-muted)' }}>
+                          7 天窗口: {resolveQuotaWindowSummary(quota.windows?.sevenDay)}
+                        </div>
+                        {quota.providerMessage && (
+                          <div style={{ fontSize: 12, color: 'var(--color-text-muted)', lineHeight: 1.5 }}>
+                            {quota.providerMessage}
+                          </div>
+                        )}
+                        {quota.lastError && (
+                          <div style={{ fontSize: 12, color: 'var(--color-danger)' }}>
+                            {quota.lastError}
+                          </div>
+                        )}
+                      </div>
+                    )}
                   </div>
                   <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
+                    <button
+                      type="button"
+                      className="btn btn-ghost"
+                      onClick={() => handleRefreshQuota(connection.accountId)}
+                      disabled={
+                        actionLoadingKey === rebindActionKey
+                        || actionLoadingKey === refreshQuotaActionKey
+                        || actionLoadingKey === deleteActionKey
+                      }
+                    >
+                      {actionLoadingKey === refreshQuotaActionKey ? '刷新中...' : '刷新额度'}
+                    </button>
                     <button
                       type="button"
                       className="btn btn-ghost"
@@ -479,7 +595,11 @@ export default function OAuthManagement() {
                         },
                         connection.accountId,
                       )}
-                      disabled={actionLoadingKey === rebindActionKey || actionLoadingKey === deleteActionKey}
+                      disabled={
+                        actionLoadingKey === rebindActionKey
+                        || actionLoadingKey === refreshQuotaActionKey
+                        || actionLoadingKey === deleteActionKey
+                      }
                     >
                       {actionLoadingKey === rebindActionKey ? '启动中...' : '重新授权'}
                     </button>
@@ -487,7 +607,11 @@ export default function OAuthManagement() {
                       type="button"
                       className="btn btn-ghost"
                       onClick={() => handleDelete(connection.accountId)}
-                      disabled={actionLoadingKey === rebindActionKey || actionLoadingKey === deleteActionKey}
+                      disabled={
+                        actionLoadingKey === rebindActionKey
+                        || actionLoadingKey === refreshQuotaActionKey
+                        || actionLoadingKey === deleteActionKey
+                      }
                     >
                       {actionLoadingKey === deleteActionKey ? '删除中...' : '删除连接'}
                     </button>