diff --git a/packages/backend/src/server/api/endpoints/meta.ts b/packages/backend/src/server/api/endpoints/meta.ts
index 5460635e1d40..43f9db2aa8b0 100644
--- a/packages/backend/src/server/api/endpoints/meta.ts
+++ b/packages/backend/src/server/api/endpoints/meta.ts
@@ -11,6 +11,8 @@ export const meta = {
 	tags: ['meta'],
 
 	requireCredential: false,
+	allowGet: true,
+	cacheSec: 60,
 
 	res: {
 		type: 'object',
diff --git a/packages/backend/src/server/api/endpoints/stats.ts b/packages/backend/src/server/api/endpoints/stats.ts
index 1e6983177f64..286a82cc524d 100644
--- a/packages/backend/src/server/api/endpoints/stats.ts
+++ b/packages/backend/src/server/api/endpoints/stats.ts
@@ -12,6 +12,8 @@ import UsersChart from '@/core/chart/charts/users.js';
 
 export const meta = {
 	requireCredential: false,
+	allowGet: true,
+	cacheSec: 60,
 
 	tags: ['meta'],
 
diff --git a/packages/backend/src/server/web/boot.js b/packages/backend/src/server/web/boot.js
index 6994feea3a57..c70e96edd6f7 100644
--- a/packages/backend/src/server/web/boot.js
+++ b/packages/backend/src/server/web/boot.js
@@ -32,6 +32,11 @@
 		renderError('FORCED_ERROR', 'This error is forced by having forceError in local storage.')
 	}
 
+	if (localStorage.getItem('id') === null) {
+		localStorage.setItem('id', crypto.randomUUID().replaceAll('-', ''));
+	}
+	let id = localStorage.getItem('id');
+
 	//#region Detect language & fetch translations
 	if (!Object.hasOwn(localStorage, 'locale')) {
 		let lang = localStorage.getItem('lang');
@@ -40,12 +45,11 @@
 		}
 
 		const metaRes = await window.fetch('/api/meta', {
-			method: 'POST',
-			body: JSON.stringify({}),
+			method: 'GET',
 			credentials: 'omit',
-			cache: 'no-cache',
 			headers: {
 				'Content-Type': 'application/json',
+				'X-Client-Transaction-Id': `${id}-misskey-${crypto.randomUUID().replaceAll('-', '')}`
 			},
 		});
 		if (metaRes.status !== 200) {
diff --git a/packages/frontend/src/boot/common.ts b/packages/frontend/src/boot/common.ts
index 79ef7b3f2d67..48a8e1679e95 100644
--- a/packages/frontend/src/boot/common.ts
+++ b/packages/frontend/src/boot/common.ts
@@ -62,10 +62,6 @@ export async function common(createVue: () => App<Element>) {
 		});
 	}
 
-	if (miLocalStorage.getItem('id') === null) {
-		miLocalStorage.setItem('id', crypto.randomUUID());
-	}
-
 	let isClientUpdated = false;
 
 	//#region クライアントが更新されたかチェック
diff --git a/packages/frontend/src/components/MkVisitorDashboard.ActiveUsersChart.vue b/packages/frontend/src/components/MkVisitorDashboard.ActiveUsersChart.vue
index b2cbf0b75e41..8fbbe31a6aae 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.ActiveUsersChart.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.ActiveUsersChart.vue
@@ -16,7 +16,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { onMounted, shallowRef, ref, nextTick } from 'vue';
 import { Chart } from 'chart.js';
 import tinycolor from 'tinycolor2';
-import { misskeyApi } from '@/scripts/misskey-api.js';
+import { misskeyApiGet } from '@/scripts/misskey-api.js';
 import { defaultStore } from '@/store.js';
 import { useChartTooltip } from '@/scripts/use-chart-tooltip.js';
 import { chartVLine } from '@/scripts/chart-vline.js';
@@ -52,7 +52,7 @@ async function renderChart() {
 		}));
 	};
 
-	const raw = await misskeyApi('charts/active-users', { limit: chartLimit, span: 'day' });
+	const raw = await misskeyApiGet('charts/active-users', { limit: chartLimit, span: 'day' });
 
 	fetching.value = false;
 
diff --git a/packages/frontend/src/components/MkVisitorDashboard.vue b/packages/frontend/src/components/MkVisitorDashboard.vue
index 6e653ea4cce1..6a19f8abc487 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.vue
@@ -79,7 +79,7 @@ import MkTimeline from '@/components/MkTimeline.vue';
 import MkInfo from '@/components/MkInfo.vue';
 import { instanceName } from '@/config.js';
 import * as os from '@/os.js';
-import { misskeyApi } from '@/scripts/misskey-api.js';
+import { misskeyApiGet } from '@/scripts/misskey-api.js';
 import { i18n } from '@/i18n.js';
 import { instance } from '@/instance.js';
 import { miLocalStorage } from '@/local-storage.js';
@@ -89,7 +89,7 @@ import { openInstanceMenu } from '@/ui/_common_/common';
 
 const stats = ref<Misskey.entities.StatsResponse | null>(null);
 
-misskeyApi('stats', {}).then((res) => {
+misskeyApiGet('stats').then((res) => {
 	stats.value = res;
 });
 
diff --git a/packages/frontend/src/instance.ts b/packages/frontend/src/instance.ts
index 281affc3c00a..51b1a89338d4 100644
--- a/packages/frontend/src/instance.ts
+++ b/packages/frontend/src/instance.ts
@@ -5,7 +5,7 @@
 
 import { computed, reactive } from 'vue';
 import * as Misskey from 'misskey-js';
-import { misskeyApi } from '@/scripts/misskey-api.js';
+import { misskeyApiGet } from '@/scripts/misskey-api.js';
 import { miLocalStorage } from '@/local-storage.js';
 import { DEFAULT_INFO_IMAGE_URL, DEFAULT_NOT_FOUND_IMAGE_URL, DEFAULT_SERVER_ERROR_IMAGE_URL } from '@/const.js';
 
@@ -47,7 +47,7 @@ export async function fetchInstance(force = false): Promise<Misskey.entities.Met
 		}
 	}
 
-	const meta = await misskeyApi('meta', {
+	const meta = await misskeyApiGet('meta', {
 		detail: true,
 	});
 
diff --git a/packages/frontend/src/pages/about.vue b/packages/frontend/src/pages/about.vue
index 3bacfb3f3348..95dec1e5e25d 100644
--- a/packages/frontend/src/pages/about.vue
+++ b/packages/frontend/src/pages/about.vue
@@ -164,7 +164,7 @@ import MkKeyValue from '@/components/MkKeyValue.vue';
 import MkInfo from '@/components/MkInfo.vue';
 import MkInstanceStats from '@/components/MkInstanceStats.vue';
 import MkHorizontalSwipe from '@/components/MkHorizontalSwipe.vue';
-import { misskeyApi } from '@/scripts/misskey-api.js';
+import { misskeyApiGet } from '@/scripts/misskey-api.js';
 import number from '@/filters/number.js';
 import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
@@ -187,8 +187,7 @@ watch(tab, () => {
 	}
 });
 
-const initStats = () => misskeyApi('stats', {
-}).then((res) => {
+const initStats = () => misskeyApiGet('stats').then((res) => {
 	stats.value = res;
 });
 
diff --git a/packages/frontend/src/pages/admin/overview.stats.vue b/packages/frontend/src/pages/admin/overview.stats.vue
index 0f4707f08d38..61688c92b8c0 100644
--- a/packages/frontend/src/pages/admin/overview.stats.vue
+++ b/packages/frontend/src/pages/admin/overview.stats.vue
@@ -63,7 +63,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { onMounted, ref } from 'vue';
 import * as Misskey from 'misskey-js';
-import { misskeyApi, misskeyApiGet } from '@/scripts/misskey-api.js';
+import { misskeyApiGet } from '@/scripts/misskey-api.js';
 import MkNumberDiff from '@/components/MkNumberDiff.vue';
 import MkNumber from '@/components/MkNumber.vue';
 import { i18n } from '@/i18n.js';
@@ -78,7 +78,7 @@ const fetching = ref(true);
 
 onMounted(async () => {
 	const [_stats, _onlineUsersCount] = await Promise.all([
-		misskeyApi('stats', {}),
+		misskeyApiGet('stats'),
 		misskeyApiGet('get-online-users-count').then(res => res.count),
 	]);
 	stats.value = _stats;
diff --git a/packages/frontend/src/scripts/misskey-api.ts b/packages/frontend/src/scripts/misskey-api.ts
index 69bbb0209786..20e63ae6e51a 100644
--- a/packages/frontend/src/scripts/misskey-api.ts
+++ b/packages/frontend/src/scripts/misskey-api.ts
@@ -15,11 +15,17 @@ export const pendingApiRequestsCount = ref(0);
 let id: string | null = miLocalStorage.getItem('id');
 export function generateClientTransactionId(initiator: string) {
 	if (id === null) {
-		id = crypto.randomUUID();
+		id = crypto.randomUUID().replaceAll('-', '');
 		miLocalStorage.setItem('id', id);
 	}
 
-	return `${id}-${initiator}-${crypto.randomUUID()}`;
+	// ハイフンが含まれている場合は除去
+	if (id.includes('-')) {
+		id = id.replaceAll('-', '');
+		miLocalStorage.setItem('id', id);
+	}
+
+	return `${id}-${initiator}-${crypto.randomUUID().replaceAll('-', '')}`;
 }
 
 function handleResponse<_ResT>(
@@ -58,24 +64,22 @@ export function misskeyApi<
 	if (endpoint.includes('://')) throw new Error('invalid endpoint');
 	pendingApiRequestsCount.value++;
 
+	const credential = token ? token : $i ? $i.token : undefined;
+
 	const onFinally = () => {
 		pendingApiRequestsCount.value--;
 	};
 
 	const promise = new Promise<_ResT>((resolve, reject) => {
-		// Append a credential
-		if ($i) (data as any).i = $i.token;
-		if (token !== undefined) (data as any).i = token;
-
 		// Send request
 		const initiateTime = Date.now();
 		window.fetch(`${apiUrl}/${endpoint}`, {
 			method: 'POST',
 			body: JSON.stringify(data),
 			credentials: 'omit',
-			cache: 'no-cache',
 			headers: {
 				'Content-Type': 'application/json',
+				'Authorization': credential ? `Bearer ${credential}` : 'anonymous',
 				'X-Client-Transaction-Id': generateClientTransactionId(initiator),
 			},
 			signal,
@@ -121,8 +125,8 @@ export function misskeyApiGet<
 		window.fetch(`${apiUrl}/${endpoint}?${query}`, {
 			method: 'GET',
 			credentials: 'omit',
-			cache: 'default',
 			headers: {
+				'Authorization': 'anonymous',
 				'X-Client-Transaction-Id': generateClientTransactionId(initiator),
 			},
 		}).then(res => {
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index d26a144a020f..d342de6d17f3 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -2535,6 +2535,13 @@ export type paths = {
     post: operations['invite___limit'];
   };
   '/meta': {
+    /**
+     * meta
+     * @description No description provided.
+     *
+     * **Credential required**: *No*
+     */
+    get: operations['meta_get'];
     /**
      * meta
      * @description No description provided.
@@ -3229,6 +3236,13 @@ export type paths = {
     post: operations['server-info'];
   };
   '/stats': {
+    /**
+     * stats
+     * @description No description provided.
+     *
+     * **Credential required**: *No*
+     */
+    get: operations['stats_get'];
     /**
      * stats
      * @description No description provided.
@@ -22271,6 +22285,60 @@ export type operations = {
       };
     };
   };
+  /**
+   * meta
+   * @description No description provided.
+   *
+   * **Credential required**: *No*
+   */
+  meta_get: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** @default true */
+          detail?: boolean;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['MetaLite'] | components['schemas']['MetaDetailed'];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
   /**
    * meta
    * @description No description provided.
@@ -26776,6 +26844,60 @@ export type operations = {
       };
     };
   };
+  /**
+   * stats
+   * @description No description provided.
+   *
+   * **Credential required**: *No*
+   */
+  stats_get: {
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': {
+            notesCount: number;
+            originalNotesCount: number;
+            usersCount: number;
+            originalUsersCount: number;
+            instances: number;
+            driveUsageLocal: number;
+            driveUsageRemote: number;
+          };
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
   /**
    * stats
    * @description No description provided.