diff --git a/src/modules/chat/hooks/useChat.js b/src/modules/chat/hooks/useChat.js
index 871952f..575a6c0 100644
--- a/src/modules/chat/hooks/useChat.js
+++ b/src/modules/chat/hooks/useChat.js
@@ -1,6 +1,5 @@
 import { useEffect, useMemo, useRef, useState } from 'react';
 import { useWhatsappSocket } from '../../../shared/hooks/useWhatsappSocket';
-import { API_BASE_URL } from '../../../shared/services/apiConfig';
 import { getAccessOptions, getAccessUsers } from '../../management/services/adminAccessService';
 import { getCurrentUser, getCurrentUserProfile } from '../../auth/services/sessionService';
 import { transferAreas as fallbackTransferAreas } from '../services/chatMocks';
@@ -10,6 +9,16 @@ import {
   pauseAgent,
   resumeAgent,
 } from '../services/agentPresenceService';
+import {
+  assignWhatsappChat,
+  closeWhatsappChat,
+  getWhatsappMessageMedia,
+  listWhatsappChats,
+  listWhatsappMessages,
+  releaseWhatsappChat,
+  sendWhatsappMessage,
+  transferWhatsappChat,
+} from '../services/whatsappChatService';
 
 const MAX_ATTACHMENT_SIZE_BYTES = 15 * 1024 * 1024;
 
@@ -412,9 +421,7 @@ export function useChat() {
       setIsLoadingChats(true);
     }
     try {
-      const response = await fetch(`${API_BASE_URL}/whatsapp/chats`);
-      if (!response.ok) throw new Error('Falha ao carregar chats do WhatsApp.');
-      const data = await response.json();
+      const data = await listWhatsappChats();
       if (!Array.isArray(data)) return;
 
       const nextContacts = data.map(normalizeChat).filter(canSeeContact);
@@ -454,9 +461,7 @@ export function useChat() {
       if (!activeContactId.includes('@')) return;
       setIsLoadingMessages(true);
       try {
-        const response = await fetch(`${API_BASE_URL}/whatsapp/messages/${encodeURIComponent(activeContactId)}`);
-        if (!response.ok) throw new Error('Falha ao carregar mensagens do WhatsApp.');
-        const data = await response.json();
+        const data = await listWhatsappMessages(activeContactId);
         if (!isMounted || !Array.isArray(data)) return;
         const normalizedMessages = dedupeMessages(
           data
@@ -601,11 +606,7 @@ export function useChat() {
     }));
 
     try {
-      const response = await fetch(
-        `${API_BASE_URL}/whatsapp/media/${encodeURIComponent(contactId)}/${encodeURIComponent(messageId)}`,
-      );
-      if (!response.ok) throw new Error('Falha ao carregar mídia.');
-      const media = await response.json();
+      const media = await getWhatsappMessageMedia(contactId, messageId);
       setMessagesByContact((current) => ({
         ...current,
         [contactId]: (current[contactId] || []).map((message) =>
@@ -630,18 +631,11 @@ export function useChat() {
     const targetAssignment = targetContact?.assignment || null;
     const areaId = targetContact?.areaId || targetAssignment?.area_id || areaOptions.find((area) => currentUserAreas.includes(area.nome))?.id;
     try {
-      const response = await fetch(`${API_BASE_URL}/whatsapp/assign`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({
-          chatId: contactId,
-          userId: String(currentUserId),
-          areaId,
-        }),
+      const assignment = await assignWhatsappChat({
+        chatId: contactId,
+        userId: String(currentUserId),
+        areaId,
       });
-
-    if (!response.ok) throw new Error('Não foi possível assumir o atendimento.');
-      const assignment = await response.json();
       updateContact(contactId, (contact) => ({
         ...contact,
         assignment,
@@ -658,18 +652,19 @@ export function useChat() {
 
   async function releaseChat() {
     if (!activeContactId?.includes('@')) return;
-    const response = await fetch(`${API_BASE_URL}/whatsapp/release/${encodeURIComponent(activeContactId)}`, {
-      method: 'DELETE',
-    });
 
-    if (!response.ok) throw new Error('Não foi possível sair do atendimento.');
-    const assignment = await response.json();
-    updateContact(activeContactId, (contact) => ({
-      ...contact,
-      assignment,
-      area: assignment?.area_nome || contact.area,
-      areaId: assignment?.area_id || contact.areaId,
-    }));
+    try {
+      const assignment = await releaseWhatsappChat(activeContactId);
+      updateContact(activeContactId, (contact) => ({
+        ...contact,
+        assignment,
+        area: assignment?.area_nome || contact.area,
+        areaId: assignment?.area_id || contact.areaId,
+      }));
+      setApiError(null);
+    } catch (error) {
+      setApiError(error.message);
+    }
   }
 
   async function closeChat() {
@@ -679,17 +674,11 @@ export function useChat() {
     if (!confirmed) return;
 
     try {
-      const response = await fetch(`${API_BASE_URL}/whatsapp/close`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({
-          chatId: activeContactId,
-          userId: currentUserId,
-        }),
+      await closeWhatsappChat({
+        chatId: activeContactId,
+        userId: currentUserId,
       });
 
-      if (!response.ok) throw new Error('Não foi possível encerrar o atendimento.');
-
       setContacts((current) => current.filter((contact) => contact.id !== activeContactId));
       setMessagesByContact((current) => {
         const next = { ...current };
@@ -798,25 +787,13 @@ export function useChat() {
     if (!contactId.includes('@')) return;
 
     try {
-      const response = await fetch(`${API_BASE_URL}/whatsapp/send`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({
-          to: contactId,
-          message: trimmed,
-          senderName: getUserDisplayName(currentUser),
-          media,
-        }),
+      await sendWhatsappMessage({
+        to: contactId,
+        message: trimmed,
+        senderName: getUserDisplayName(currentUser),
+        media,
       });
 
-      if (!response.ok) {
-        const message =
-          response.status === 413
-            ? 'Arquivo muito grande para envio. Tente uma mídia menor.'
-            : 'Não foi possível enviar a mensagem.';
-        throw new Error(message);
-      }
-
       setApiError(null);
       updateContact(contactId, (contact) => ({
         ...contact,
@@ -825,7 +802,11 @@ export function useChat() {
           : contact.assignment,
       }));
     } catch (error) {
-      setApiError(error.message);
+      setApiError(
+        error.status === 413
+          ? 'Arquivo muito grande para envio. Tente uma midia menor.'
+          : error.message,
+      );
     }
   }
 
@@ -834,7 +815,7 @@ export function useChat() {
     const areaId = selectedTransferArea?.id;
 
     if (!areaId) {
-      setApiError('Selecione uma especialidade válida para transferência.');
+      setApiError('Selecione uma especialidade valida para transferencia.');
       return;
     }
 
@@ -844,47 +825,40 @@ export function useChat() {
     }
 
     const targetUserId = isSameUserArea && transferAttendant ? Number(transferAttendant) : null;
-    const response = await fetch(`${API_BASE_URL}/whatsapp/transfer`, {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({
+
+    try {
+      const assignment = await transferWhatsappChat({
         chatId: activeContactId,
         areaId,
         userId: targetUserId,
         note,
-      }),
-    });
+      });
+      const transferMessage = targetUserId
+        ? `Transferencia solicitada para ${transferArea}. Obs: ${note || 'Sem observacao.'}`
+        : `Transferencia enviada para a fila de ${transferArea}. Obs: ${note || 'Sem observacao.'}`;
 
-    if (!response.ok) {
-      setApiError('Não foi possível transferir o atendimento.');
-      return;
+      setMessagesByContact((current) => ({
+        ...current,
+        [activeContactId]: [
+          ...(current[activeContactId] || []),
+          { id: Date.now() + 2, sender: 'system', text: transferMessage },
+        ],
+      }));
+
+      updateContact(activeContactId, (contact) => ({
+        ...contact,
+        area: assignment.area_nome || transferArea,
+        areaId: assignment.area_id || areaId,
+        assignment,
+      }));
+      setSelectedArea(transferArea);
+      setIsTransferOpen(false);
+      setTransferNote('');
+      setApiError(null);
+    } catch (error) {
+      setApiError(error.message);
     }
-
-    const assignment = await response.json();
-    const transferMessage = targetUserId
-      ? `Transferência solicitada para ${transferArea}. Obs: ${note || 'Sem observação.'}`
-      : `Transferência enviada para a fila de ${transferArea}. Obs: ${note || 'Sem observação.'}`;
-
-    setMessagesByContact((current) => ({
-      ...current,
-      [activeContactId]: [
-        ...(current[activeContactId] || []),
-        { id: Date.now() + 2, sender: 'system', text: transferMessage },
-      ],
-    }));
-
-    updateContact(activeContactId, (contact) => ({
-      ...contact,
-      area: assignment.area_nome || transferArea,
-      areaId: assignment.area_id || areaId,
-      assignment,
-    }));
-    setSelectedArea(transferArea);
-    setIsTransferOpen(false);
-    setTransferNote('');
-    setApiError(null);
   }
-
   return {
     currentUserId,
     contacts,
diff --git a/src/modules/chat/services/whatsappChatService.js b/src/modules/chat/services/whatsappChatService.js
new file mode 100644
index 0000000..c376d2b
--- /dev/null
+++ b/src/modules/chat/services/whatsappChatService.js
@@ -0,0 +1,58 @@
+import { apiRequest } from '../../../shared/services/apiClient';
+
+export function listWhatsappChats() {
+  return apiRequest('/whatsapp/chats', {
+    fallbackMessage: 'Falha ao carregar chats do WhatsApp.',
+  });
+}
+
+export function listWhatsappMessages(chatId) {
+  return apiRequest(`/whatsapp/messages/${encodeURIComponent(chatId)}`, {
+    fallbackMessage: 'Falha ao carregar mensagens do WhatsApp.',
+  });
+}
+
+export function getWhatsappMessageMedia(chatId, messageId) {
+  return apiRequest(`/whatsapp/media/${encodeURIComponent(chatId)}/${encodeURIComponent(messageId)}`, {
+    fallbackMessage: 'Falha ao carregar midia.',
+  });
+}
+
+export function assignWhatsappChat(payload) {
+  return apiRequest('/whatsapp/assign', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+    fallbackMessage: 'Nao foi possivel assumir o atendimento.',
+  });
+}
+
+export function releaseWhatsappChat(chatId) {
+  return apiRequest(`/whatsapp/release/${encodeURIComponent(chatId)}`, {
+    method: 'DELETE',
+    fallbackMessage: 'Nao foi possivel sair do atendimento.',
+  });
+}
+
+export function closeWhatsappChat(payload) {
+  return apiRequest('/whatsapp/close', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+    fallbackMessage: 'Nao foi possivel encerrar o atendimento.',
+  });
+}
+
+export function sendWhatsappMessage(payload) {
+  return apiRequest('/whatsapp/send', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+    fallbackMessage: 'Nao foi possivel enviar a mensagem.',
+  });
+}
+
+export function transferWhatsappChat(payload) {
+  return apiRequest('/whatsapp/transfer', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+    fallbackMessage: 'Nao foi possivel transferir o atendimento.',
+  });
+}