diff --git a/lib/api/auth.ts b/lib/api/auth.ts
new file mode 100644
index 0000000..271395c
--- /dev/null
+++ b/lib/api/auth.ts
@@ -0,0 +1,65 @@
+import axiosInstance from "./axiosInstanceApi";
+
+interface signInProps {
+  email: string;
+  password: string;
+}
+
+interface signUpProps extends signInProps {
+  name: string;
+}
+
+interface easySignInProps {
+  token: string;
+  redirectUri: string;
+}
+
+interface easySignUpProps extends easySignInProps {
+  name: string;
+}
+
+// 회원가입
+export const postSignUp = async (body: signUpProps) => {
+  try {
+    const res = await axiosInstance.post("/auth/sign-up", body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 로그인
+export const postSignIn = async (body: signInProps) => {
+  try {
+    const res = await axiosInstance.post("/auth/sign-in", body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 간편 회원가입
+export const postEasySignUp = async (
+  provider: "google" | "kakao",
+  body: easySignUpProps
+) => {
+  try {
+    const res = await axiosInstance.post(`/auth/sign-up/${provider}`, body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 간편 로그인
+export const postEasySignIn = async (
+  provider: "google" | "kakao",
+  body: easySignInProps
+) => {
+  try {
+    const res = await axiosInstance.post(`/auth/sign-in/${provider}`, body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
diff --git a/lib/api/axiosInstanceApi.ts b/lib/api/axiosInstanceApi.ts
index 79d8c0e..5310b16 100644
--- a/lib/api/axiosInstanceApi.ts
+++ b/lib/api/axiosInstanceApi.ts
@@ -5,4 +5,10 @@ const axiosInstance = axios.create({
   timeout: 5000,
 });
 
+export const proxy = axios.create({
+  // 배포 이후에는 배포된 URL로 변경해야 함.
+  baseURL: "http://localhost:3000",
+  timeout: 5000,
+});
+
 export default axiosInstance;
diff --git a/lib/api/folder.ts b/lib/api/folder.ts
new file mode 100644
index 0000000..90423dd
--- /dev/null
+++ b/lib/api/folder.ts
@@ -0,0 +1,55 @@
+import axiosInstance, { proxy } from "./axiosInstanceApi";
+
+interface folderApiProps {
+  name: string;
+}
+
+// 유저의 모든 폴더 조회(auth)
+export const getFolders = async () => {
+  try {
+    const res = await proxy.get("/api/folders");
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 유저의 폴더 생성(auth)
+export const postFolders = async (body: folderApiProps) => {
+  try {
+    const res = await proxy.post("/api/folders", body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 폴더 조회
+export const getFolder = async (forderId: number) => {
+  try {
+    const res = await axiosInstance.get(`/folders/${forderId}`);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 폴더 삭제(auth)
+export const deleteFolder = async (forderId: number) => {
+  try {
+    const res = await proxy.delete(`/api/folders/${forderId}`);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 폴더 이름 수정(auth)
+export const putFolder = async (forderId: number, body: folderApiProps) => {
+  try {
+    const res = await proxy.put(`/api/folders/${forderId}`, body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
diff --git a/lib/api/link.ts b/lib/api/link.ts
new file mode 100644
index 0000000..54a62d5
--- /dev/null
+++ b/lib/api/link.ts
@@ -0,0 +1,92 @@
+import axiosInstance, { proxy } from "./axiosInstanceApi";
+
+interface postLinkProps {
+  url: string;
+  folderId: number;
+}
+
+interface putLinkURLProps {
+  url: string;
+}
+
+interface putFolderNameProps {
+  favorite: boolean;
+}
+
+// 폴더에 속한 링크 조회
+export const getLink = async (query: any, forderId: number) => {
+  let queryString;
+  query ? (queryString = `?page=${query.page}&pageSize=${query.pageSize}`) : "";
+
+  try {
+    const res = await axiosInstance.get(
+      `/folders/${forderId}/links${queryString}`
+    );
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 링크 생성(auth)
+export const postLink = async (body: postLinkProps) => {
+  try {
+    const res = await proxy.post("/api/links", body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 유저의 전체 링크 조회(auth)
+export const getLinks = async () => {
+  try {
+    const res = await proxy.get("/api/links");
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 유저의 즐겨찾기 링크 조회(auth)
+export const getFavorites = async () => {
+  try {
+    const res = await proxy.get("/api/favorites");
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 링크 URL 수정(auth)
+export const putLinkURL = async (linkId: number, body: putLinkURLProps) => {
+  try {
+    const res = await proxy.put(`/api/links/${linkId}`, body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 링크 삭제(auth)
+export const deleteLinkURL = async (linkId: number) => {
+  try {
+    const res = await proxy.delete(`/api/links/${linkId}`);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 링크의 즐겨찾기 설정(auth)
+export const putFolderName = async (
+  linkId: number,
+  body: putFolderNameProps
+) => {
+  try {
+    const res = await proxy.put(`/api/links/${linkId}`, body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
diff --git a/lib/api/oauth.ts b/lib/api/oauth.ts
new file mode 100644
index 0000000..1c40f1e
--- /dev/null
+++ b/lib/api/oauth.ts
@@ -0,0 +1,16 @@
+import axiosInstance from "./axiosInstanceApi";
+
+interface postOAuthProps {
+  provider: string;
+  appKey: string;
+}
+
+// 간편 로그인 App 등록/수정
+export const postOAuth = async (body: postOAuthProps) => {
+  try {
+    const res = await axiosInstance.post("/oauthApps", body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
diff --git a/lib/api/user.ts b/lib/api/user.ts
new file mode 100644
index 0000000..2059943
--- /dev/null
+++ b/lib/api/user.ts
@@ -0,0 +1,25 @@
+import axiosInstance, { proxy } from "./axiosInstanceApi";
+
+interface postUserProps {
+  email: string;
+}
+
+// 현재 유저 조회(auth)
+export const getUserInfo = async () => {
+  try {
+    const res = await proxy.get("/api/users");
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};
+
+// 이메일 중복 확인
+export const postCheckEmail = async (body: postUserProps) => {
+  try {
+    const res = await axiosInstance.post("/users/check-email", body);
+    if (res.status >= 200 && res.status < 300) return res.data;
+  } catch (err) {
+    console.error("에러 메시지: ", err instanceof Error ? err.message : err);
+  }
+};