diff --git a/src/__data__/api/api.ts b/src/__data__/api/api.ts
index bf9adea..6790690 100644
--- a/src/__data__/api/api.ts
+++ b/src/__data__/api/api.ts
@@ -41,12 +41,12 @@ export const api = createApi({
     // Tasks
     getTasks: builder.query<ChallengeTask[], void>({
       query: () => '/challenge/tasks',
-      transformResponse: (response: { data: ChallengeTask[] }) => response.data,
+      transformResponse: (response: { body: ChallengeTask[] }) => response.body,
       providesTags: ['Task'],
     }),
     getTask: builder.query<ChallengeTask, string>({
       query: (id) => `/challenge/task/${id}`,
-      transformResponse: (response: { data: ChallengeTask }) => response.data,
+      transformResponse: (response: { body: ChallengeTask }) => response.body,
       providesTags: (_result, _error, id) => [{ type: 'Task', id }],
     }),
     createTask: builder.mutation<ChallengeTask, CreateTaskRequest>({
@@ -55,7 +55,7 @@ export const api = createApi({
         method: 'POST',
         body,
       }),
-      transformResponse: (response: { data: ChallengeTask }) => response.data,
+      transformResponse: (response: { body: ChallengeTask }) => response.body,
       invalidatesTags: ['Task'],
     }),
     updateTask: builder.mutation<ChallengeTask, { id: string; data: UpdateTaskRequest }>({
@@ -64,7 +64,7 @@ export const api = createApi({
         method: 'PUT',
         body: data,
       }),
-      transformResponse: (response: { data: ChallengeTask }) => response.data,
+      transformResponse: (response: { body: ChallengeTask }) => response.body,
       invalidatesTags: (_result, _error, { id }) => [{ type: 'Task', id }, 'Task'],
     }),
     deleteTask: builder.mutation<void, string>({
@@ -78,12 +78,12 @@ export const api = createApi({
     // Chains
     getChains: builder.query<ChallengeChain[], void>({
       query: () => '/challenge/chains',
-      transformResponse: (response: { data: ChallengeChain[] }) => response.data,
+      transformResponse: (response: { body: ChallengeChain[] }) => response.body,
       providesTags: ['Chain'],
     }),
     getChain: builder.query<ChallengeChain, string>({
       query: (id) => `/challenge/chain/${id}`,
-      transformResponse: (response: { data: ChallengeChain }) => response.data,
+      transformResponse: (response: { body: ChallengeChain }) => response.body,
       providesTags: (_result, _error, id) => [{ type: 'Chain', id }],
     }),
     createChain: builder.mutation<ChallengeChain, CreateChainRequest>({
@@ -92,7 +92,7 @@ export const api = createApi({
         method: 'POST',
         body,
       }),
-      transformResponse: (response: { data: ChallengeChain }) => response.data,
+      transformResponse: (response: { body: ChallengeChain }) => response.body,
       invalidatesTags: ['Chain'],
     }),
     updateChain: builder.mutation<ChallengeChain, { id: string; data: UpdateChainRequest }>({
@@ -101,7 +101,7 @@ export const api = createApi({
         method: 'PUT',
         body: data,
       }),
-      transformResponse: (response: { data: ChallengeChain }) => response.data,
+      transformResponse: (response: { body: ChallengeChain }) => response.body,
       invalidatesTags: (_result, _error, { id }) => [{ type: 'Chain', id }, 'Chain'],
     }),
     deleteChain: builder.mutation<void, string>({
@@ -115,19 +115,19 @@ export const api = createApi({
     // Users
     getUsers: builder.query<ChallengeUser[], void>({
       query: () => '/challenge/users',
-      transformResponse: (response: { data: ChallengeUser[] }) => response.data,
+      transformResponse: (response: { body: ChallengeUser[] }) => response.body,
       providesTags: ['User'],
     }),
 
     // Statistics
     getSystemStats: builder.query<SystemStats, void>({
       query: () => '/challenge/stats',
-      transformResponse: (response: { data: SystemStats }) => response.data,
+      transformResponse: (response: { body: SystemStats }) => response.body,
       providesTags: ['Stats'],
     }),
     getUserStats: builder.query<UserStats, string>({
       query: (userId) => `/challenge/user/${userId}/stats`,
-      transformResponse: (response: { data: UserStats }) => response.data,
+      transformResponse: (response: { body: UserStats }) => response.body,
       providesTags: (_result, _error, userId) => [{ type: 'User', id: userId }],
     }),
 
@@ -137,12 +137,12 @@ export const api = createApi({
         const params = taskId ? `?taskId=${taskId}` : ''
         return `/challenge/user/${userId}/submissions${params}`
       },
-      transformResponse: (response: { data: ChallengeSubmission[] }) => response.data,
+      transformResponse: (response: { body: ChallengeSubmission[] }) => response.body,
       providesTags: ['Submission'],
     }),
     getAllSubmissions: builder.query<ChallengeSubmission[], void>({
       query: () => '/challenge/submissions',
-      transformResponse: (response: { data: ChallengeSubmission[] }) => response.data,
+      transformResponse: (response: { body: ChallengeSubmission[] }) => response.body,
       providesTags: ['Submission'],
     }),
   }),
diff --git a/stubs/api/README.md b/stubs/api/README.md
index 6329a26..21ee61a 100644
--- a/stubs/api/README.md
+++ b/stubs/api/README.md
@@ -50,18 +50,19 @@ stubs/api/
 ### Успешный ответ
 ```json
 {
-  "error": null,
-  "data": <данные>
+  "success": true,
+  "body": <данные>
 }
 ```
 
 ### Ошибка
 ```json
 {
+  "success": false,
+  "body": null,
   "error": {
     "message": "Описание ошибки"
-  },
-  "data": null
+  }
 }
 ```
 
diff --git a/stubs/api/index.js b/stubs/api/index.js
index ef3a808..9a5ac54 100644
--- a/stubs/api/index.js
+++ b/stubs/api/index.js
@@ -11,14 +11,15 @@ const loadJSON = (filename) => {
   return JSON.parse(data);
 };
 
-const respond = (res, data) => {
-  res.json({ error: null, data });
+const respond = (res, body) => {
+  res.json({ success: true, body });
 };
 
 const respondError = (res, message, statusCode = 400) => {
   res.status(statusCode).json({ 
-    error: { message }, 
-    data: null 
+    success: false,
+    body: null,
+    error: { message }
   });
 };