diff --git a/src/shared/apis/config.ts b/src/shared/apis/config.ts
index b95b025..1d6d5ea 100644
--- a/src/shared/apis/config.ts
+++ b/src/shared/apis/config.ts
@@ -1,12 +1,3 @@
-const apiBaseUrl = process.env.NEXT_PUBLIC_API_BASE_URL;
-const apiTeamId = process.env.NEXT_PUBLIC_API_TEAM_ID;
-
-if (!apiBaseUrl) {
-  throw new Error('NEXT_PUBLIC_API_BASE_URL is not defined.');
-}
-if (!apiTeamId) {
-  throw new Error('NEXT_PUBLIC_API_TEAM_ID is not defined.');
-}
-
-export const BASE_URL = apiBaseUrl;
-export const TEAM_ID = apiTeamId;
+// 빌드 시점이 아닌 실제 API 호출 시점에 유효성 검사를 수행하기 위해 undefined 허용
+export const BASE_URL = process.env.NEXT_PUBLIC_API_BASE_URL;
+export const TEAM_ID = process.env.NEXT_PUBLIC_API_TEAM_ID;
diff --git a/src/shared/apis/fetchApi.ts b/src/shared/apis/fetchApi.ts
index 41496eb..0b707ed 100644
--- a/src/shared/apis/fetchApi.ts
+++ b/src/shared/apis/fetchApi.ts
@@ -1,7 +1,6 @@
 import { BASE_URL, TEAM_ID } from './config';
 
 const BODYLESS_METHODS = new Set(['GET', 'HEAD']);
-const NORMALIZED_BASE_URL = normalizeBaseUrl(BASE_URL);
 const DEV_ACCESS_TOKEN = process.env.NEXT_PUBLIC_DEV_ACCESS_TOKEN;
 const IS_DEVELOPMENT = process.env.NODE_ENV === 'development';
 
@@ -14,8 +13,12 @@ function normalizePath(path: string) {
 }
 
 function buildApiUrl(path: string) {
+  // 실제 API 호출 시점에 환경변수 유효성 검사
+  if (!BASE_URL) throw new Error('NEXT_PUBLIC_API_BASE_URL is not defined.');
+  if (!TEAM_ID) throw new Error('NEXT_PUBLIC_API_TEAM_ID is not defined.');
+
   const relativePath = `${TEAM_ID}/${normalizePath(path)}`;
-  return new URL(relativePath, NORMALIZED_BASE_URL).toString();
+  return new URL(relativePath, normalizeBaseUrl(BASE_URL)).toString();
 }
 
 function getMethod(options: RequestInit) {