diff --git a/packages/backend/test/e2e/2fa.ts b/packages/backend/test/e2e/2fa.ts
index ed967d2620..dfed8b2fce 100644
--- a/packages/backend/test/e2e/2fa.ts
+++ b/packages/backend/test/e2e/2fa.ts
@@ -24,7 +24,7 @@ import type * as misskey from 'misskey-js';
 
 describe('2要素認証', () => {
 	let app: INestApplicationContext;
-	let alice: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
 
 	const config = loadConfig();
 	const password = 'test';
diff --git a/packages/backend/test/e2e/antennas.ts b/packages/backend/test/e2e/antennas.ts
index c0317f1435..9bac5122d4 100644
--- a/packages/backend/test/e2e/antennas.ts
+++ b/packages/backend/test/e2e/antennas.ts
@@ -37,7 +37,7 @@ describe('アンテナ', () => {
 	// - srcのenumにgroupが残っている
 	// - userGroupIdが残っている, isActiveがない
 	type Antenna = misskey.entities.Antenna | Packed<'Antenna'>;
-	type User = misskey.entities.MeSignup;
+	type User = misskey.entities.SignupResponse;
 	type Note = misskey.entities.Note;
 
 	// アンテナを作成できる最小のパラメタ
diff --git a/packages/backend/test/e2e/api-visibility.ts b/packages/backend/test/e2e/api-visibility.ts
index 33c8d03fdb..afe4f9c05a 100644
--- a/packages/backend/test/e2e/api-visibility.ts
+++ b/packages/backend/test/e2e/api-visibility.ts
@@ -24,15 +24,15 @@ describe('API visibility', () => {
 	describe('Note visibility', () => {
 		//#region vars
 		/** ヒロイン */
-		let alice: misskey.entities.MeSignup;
+		let alice: misskey.entities.SignupResponse;
 		/** フォロワー */
-		let follower: misskey.entities.MeSignup;
+		let follower: misskey.entities.SignupResponse;
 		/** 非フォロワー */
-		let other: misskey.entities.MeSignup;
+		let other: misskey.entities.SignupResponse;
 		/** 非フォロワーでもリプライやメンションをされた人 */
-		let target: misskey.entities.MeSignup;
+		let target: misskey.entities.SignupResponse;
 		/** specified mentionでmentionを飛ばされる人 */
-		let target2: misskey.entities.MeSignup;
+		let target2: misskey.entities.SignupResponse;
 
 		/** public-post */
 		let pub: any;
diff --git a/packages/backend/test/e2e/api.ts b/packages/backend/test/e2e/api.ts
index cf24228b83..ad351eebbb 100644
--- a/packages/backend/test/e2e/api.ts
+++ b/packages/backend/test/e2e/api.ts
@@ -13,9 +13,9 @@ import type * as misskey from 'misskey-js';
 
 describe('API', () => {
 	let app: INestApplicationContext;
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/block.ts b/packages/backend/test/e2e/block.ts
index 4445d9036c..25ff9f11ac 100644
--- a/packages/backend/test/e2e/block.ts
+++ b/packages/backend/test/e2e/block.ts
@@ -14,9 +14,9 @@ describe('Block', () => {
 	let app: INestApplicationContext;
 
 	// alice blocks bob
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/endpoints.ts b/packages/backend/test/e2e/endpoints.ts
index 2ef3434bca..bfd0b0272d 100644
--- a/packages/backend/test/e2e/endpoints.ts
+++ b/packages/backend/test/e2e/endpoints.ts
@@ -17,10 +17,10 @@ import type * as misskey from 'misskey-js';
 describe('Endpoints', () => {
 	let app: INestApplicationContext;
 
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
-	let dave: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
+	let dave: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/fetch-resource.ts b/packages/backend/test/e2e/fetch-resource.ts
index 251d662760..28affe7768 100644
--- a/packages/backend/test/e2e/fetch-resource.ts
+++ b/packages/backend/test/e2e/fetch-resource.ts
@@ -25,7 +25,7 @@ const JSON_UTF8 = 'application/json; charset=utf-8';
 describe('Webリソース', () => {
 	let app: INestApplicationContext;
 
-	let alice: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
 	let aliceUploadedFile: any;
 	let alicesPost: any;
 	let alicePage: any;
@@ -34,7 +34,7 @@ describe('Webリソース', () => {
 	let aliceGalleryPost: any;
 	let aliceChannel: any;
 
-	let bob: misskey.entities.MeSignup;
+	let bob: misskey.entities.SignupResponse;
 
 	type Request = {
 		path: string,
diff --git a/packages/backend/test/e2e/ff-visibility.ts b/packages/backend/test/e2e/ff-visibility.ts
index 1fbd45c741..4d323e14e7 100644
--- a/packages/backend/test/e2e/ff-visibility.ts
+++ b/packages/backend/test/e2e/ff-visibility.ts
@@ -13,8 +13,8 @@ import type * as misskey from 'misskey-js';
 describe('FF visibility', () => {
 	let app: INestApplicationContext;
 
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/move.ts b/packages/backend/test/e2e/move.ts
index b009ef124a..f7da66a27c 100644
--- a/packages/backend/test/e2e/move.ts
+++ b/packages/backend/test/e2e/move.ts
@@ -20,12 +20,12 @@ describe('Account Move', () => {
 	let url: URL;
 
 	let root: any;
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
-	let dave: misskey.entities.MeSignup;
-	let eve: misskey.entities.MeSignup;
-	let frank: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
+	let dave: misskey.entities.SignupResponse;
+	let eve: misskey.entities.SignupResponse;
+	let frank: misskey.entities.SignupResponse;
 
 	let Users: UsersRepository;
 
diff --git a/packages/backend/test/e2e/mute.ts b/packages/backend/test/e2e/mute.ts
index a4b57a1eba..3b5542dfe0 100644
--- a/packages/backend/test/e2e/mute.ts
+++ b/packages/backend/test/e2e/mute.ts
@@ -14,9 +14,9 @@ describe('Mute', () => {
 	let app: INestApplicationContext;
 
 	// alice mutes carol
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/note.ts b/packages/backend/test/e2e/note.ts
index 961df99cc2..8d33c63485 100644
--- a/packages/backend/test/e2e/note.ts
+++ b/packages/backend/test/e2e/note.ts
@@ -16,8 +16,8 @@ describe('Note', () => {
 	let app: INestApplicationContext;
 	let Notes: any;
 
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/oauth.ts b/packages/backend/test/e2e/oauth.ts
index 3a5e4ebdae..3ca1f8b542 100644
--- a/packages/backend/test/e2e/oauth.ts
+++ b/packages/backend/test/e2e/oauth.ts
@@ -75,7 +75,7 @@ function getMeta(html: string): { transactionId: string | undefined, clientName:
 	};
 }
 
-function fetchDecision(transactionId: string, user: misskey.entities.MeSignup, { cancel }: { cancel?: boolean } = {}): Promise<Response> {
+function fetchDecision(transactionId: string, user: misskey.entities.SignupResponse, { cancel }: { cancel?: boolean } = {}): Promise<Response> {
 	return fetch(new URL('/oauth/decision', host), {
 		method: 'post',
 		body: new URLSearchParams({
@@ -90,14 +90,14 @@ function fetchDecision(transactionId: string, user: misskey.entities.MeSignup, {
 	});
 }
 
-async function fetchDecisionFromResponse(response: Response, user: misskey.entities.MeSignup, { cancel }: { cancel?: boolean } = {}): Promise<Response> {
+async function fetchDecisionFromResponse(response: Response, user: misskey.entities.SignupResponse, { cancel }: { cancel?: boolean } = {}): Promise<Response> {
 	const { transactionId } = getMeta(await response.text());
 	assert.ok(transactionId);
 
 	return await fetchDecision(transactionId, user, { cancel });
 }
 
-async function fetchAuthorizationCode(user: misskey.entities.MeSignup, scope: string, code_challenge: string): Promise<{ client: AuthorizationCode, code: string }> {
+async function fetchAuthorizationCode(user: misskey.entities.SignupResponse, scope: string, code_challenge: string): Promise<{ client: AuthorizationCode, code: string }> {
 	const client = new AuthorizationCode(clientConfig);
 
 	const response = await fetch(client.authorizeURL({
@@ -150,8 +150,8 @@ describe('OAuth', () => {
 	let app: INestApplicationContext;
 	let fastify: FastifyInstance;
 
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
 
 	let sender: (reply: FastifyReply) => void;
 
diff --git a/packages/backend/test/e2e/renote-mute.ts b/packages/backend/test/e2e/renote-mute.ts
index 7d57ba17b6..fededdff32 100644
--- a/packages/backend/test/e2e/renote-mute.ts
+++ b/packages/backend/test/e2e/renote-mute.ts
@@ -14,9 +14,9 @@ describe('Renote Mute', () => {
 	let app: INestApplicationContext;
 
 	// alice mutes carol
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/streaming.ts b/packages/backend/test/e2e/streaming.ts
index 288c54bdbc..a447ba94ae 100644
--- a/packages/backend/test/e2e/streaming.ts
+++ b/packages/backend/test/e2e/streaming.ts
@@ -32,15 +32,15 @@ describe('Streaming', () => {
 
 	describe('Streaming', () => {
 		// Local users
-		let ayano: misskey.entities.MeSignup;
-		let kyoko: misskey.entities.MeSignup;
-		let chitose: misskey.entities.MeSignup;
-		let kanako: misskey.entities.MeSignup;
+		let ayano: misskey.entities.SignupResponse;
+		let kyoko: misskey.entities.SignupResponse;
+		let chitose: misskey.entities.SignupResponse;
+		let kanako: misskey.entities.SignupResponse;
 
 		// Remote users
-		let akari: misskey.entities.MeSignup;
-		let chinatsu: misskey.entities.MeSignup;
-		let takumi: misskey.entities.MeSignup;
+		let akari: misskey.entities.SignupResponse;
+		let chinatsu: misskey.entities.SignupResponse;
+		let takumi: misskey.entities.SignupResponse;
 
 		let kyokoNote: any;
 		let kanakoNote: any;
diff --git a/packages/backend/test/e2e/thread-mute.ts b/packages/backend/test/e2e/thread-mute.ts
index 0e487976dc..5c68e2b150 100644
--- a/packages/backend/test/e2e/thread-mute.ts
+++ b/packages/backend/test/e2e/thread-mute.ts
@@ -13,9 +13,9 @@ import type * as misskey from 'misskey-js';
 describe('Note thread mute', () => {
 	let app: INestApplicationContext;
 
-	let alice: misskey.entities.MeSignup;
-	let bob: misskey.entities.MeSignup;
-	let carol: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
+	let bob: misskey.entities.SignupResponse;
+	let carol: misskey.entities.SignupResponse;
 
 	beforeAll(async () => {
 		app = await startServer();
diff --git a/packages/backend/test/e2e/user-notes.ts b/packages/backend/test/e2e/user-notes.ts
index b5f00a6327..4f2e7c4cf3 100644
--- a/packages/backend/test/e2e/user-notes.ts
+++ b/packages/backend/test/e2e/user-notes.ts
@@ -13,7 +13,7 @@ import type * as misskey from 'misskey-js';
 describe('users/notes', () => {
 	let app: INestApplicationContext;
 
-	let alice: misskey.entities.MeSignup;
+	let alice: misskey.entities.SignupResponse;
 	let jpgNote: any;
 	let pngNote: any;
 	let jpgPngNote: any;
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index d4c43f207c..ddd69ce248 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -1034,6 +1034,18 @@ export type Endpoints = Overwrite<Endpoints_2, {
             };
         };
     };
+    'signup': {
+        req: SignupRequest;
+        res: SignupResponse;
+    };
+    'signup-pending': {
+        req: SignupPendingRequest;
+        res: SignupPendingResponse;
+    };
+    'signin': {
+        req: SigninRequest;
+        res: SigninResponse;
+    };
 }>;
 
 // @public (undocumented)
@@ -1053,6 +1065,12 @@ declare namespace entities {
         EmojiUpdated,
         EmojiDeleted,
         AnnouncementCreated,
+        SignupRequest,
+        SignupResponse,
+        SignupPendingRequest,
+        SignupPendingResponse,
+        SigninRequest,
+        SigninResponse,
         EmptyRequest,
         EmptyResponse,
         AdminMetaResponse,
@@ -2615,6 +2633,47 @@ type ServerStatsLog = string[];
 // @public (undocumented)
 type Signin = components['schemas']['Signin'];
 
+// @public (undocumented)
+type SigninRequest = {
+    username: string;
+    password: string;
+    token?: string;
+};
+
+// @public (undocumented)
+type SigninResponse = {
+    id: User['id'];
+    i: string;
+};
+
+// @public (undocumented)
+type SignupPendingRequest = {
+    code: string;
+};
+
+// @public (undocumented)
+type SignupPendingResponse = {
+    id: User['id'];
+    i: string;
+};
+
+// @public (undocumented)
+type SignupRequest = {
+    username: string;
+    password: string;
+    host?: string;
+    invitationCode?: string;
+    emailAddress?: string;
+    'hcaptcha-response'?: string | null;
+    'g-recaptcha-response'?: string | null;
+    'turnstile-response'?: string | null;
+};
+
+// @public (undocumented)
+type SignupResponse = MeDetailed & {
+    token: string;
+};
+
 // @public (undocumented)
 type StatsResponse = operations['stats']['responses']['200']['content']['application/json'];
 
diff --git a/packages/misskey-js/src/api.types.ts b/packages/misskey-js/src/api.types.ts
index d97646b7cc..75ab7d91b1 100644
--- a/packages/misskey-js/src/api.types.ts
+++ b/packages/misskey-js/src/api.types.ts
@@ -1,6 +1,14 @@
 import { Endpoints as Gen } from './autogen/endpoint';
 import { UserDetailed } from './autogen/models';
 import { UsersShowRequest } from './autogen/entities';
+import {
+	SigninRequest,
+	SigninResponse,
+	SignupPendingRequest,
+	SignupPendingResponse,
+	SignupRequest,
+	SignupResponse,
+} from './entities';
 
 type Overwrite<T, U extends { [Key in keyof T]?: unknown }> = Omit<
 	T,
@@ -55,6 +63,21 @@ export type Endpoints = Overwrite<
 					$default: UserDetailed;
 				};
 			};
-		}
+		},
+		// api.jsonには載せないものなのでここで定義
+		'signup': {
+			req: SignupRequest;
+			res: SignupResponse;
+		},
+		// api.jsonには載せないものなのでここで定義
+		'signup-pending': {
+			req: SignupPendingRequest;
+			res: SignupPendingResponse;
+		},
+		// api.jsonには載せないものなのでここで定義
+		'signin': {
+			req: SigninRequest;
+			res: SigninResponse;
+		},
 	}
 >
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index 99f433cc02..6314c88e0b 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -1,5 +1,5 @@
 import { ModerationLogPayloads } from './consts.js';
-import { Announcement, EmojiDetailed, Page, User, UserDetailed } from './autogen/models';
+import { Announcement, EmojiDetailed, MeDetailed, MeDetailedOnly, Page, User, UserDetailed } from './autogen/models';
 
 export * from './autogen/entities';
 export * from './autogen/models';
@@ -183,3 +183,38 @@ export type EmojiDeleted = {
 export type AnnouncementCreated = {
 	announcement: Announcement;
 };
+
+export type SignupRequest = {
+	username: string;
+	password: string;
+	host?: string;
+	invitationCode?: string;
+	emailAddress?: string;
+	'hcaptcha-response'?: string | null;
+	'g-recaptcha-response'?: string | null;
+	'turnstile-response'?: string | null;
+}
+
+export type SignupResponse = MeDetailed & {
+	token: string;
+}
+
+export type SignupPendingRequest = {
+	code: string;
+};
+
+export type SignupPendingResponse = {
+	id: User['id'],
+	i: string,
+};
+
+export type SigninRequest = {
+	username: string;
+	password: string;
+	token?: string;
+};
+
+export type SigninResponse = {
+	id: User['id'],
+	i: string,
+};