diff --git a/apps/backend/src/modules/auth/auth.controller.ts b/apps/backend/src/modules/auth/auth.controller.ts
index 9fa4323..136b0df 100644
--- a/apps/backend/src/modules/auth/auth.controller.ts
+++ b/apps/backend/src/modules/auth/auth.controller.ts
@@ -1,6 +1,12 @@
 import { Request, Response } from "express";
 import { StatusCodes } from "http-status-codes";
-import { sendOtp, verifyOtp, refreshAccessToken, logout } from "./auth.service";
+import {
+  sendOtp,
+  checkOtpStatus,
+  verifyOtp,
+  refreshAccessToken,
+  logout,
+} from "./auth.service";
 
 const sendOtpController = async (req: Request, res: Response) => {
   const { phoneNumber } = req.body;
@@ -8,6 +14,14 @@ const sendOtpController = async (req: Request, res: Response) => {
   res.status(StatusCodes.OK).json({ message: "OTP was sent successfully." });
 };
 
+const checkOtpStatusController = async (req: Request, res: Response) => {
+  const { phoneNumber } = req.body;
+  await checkOtpStatus(phoneNumber);
+  res
+    .status(StatusCodes.OK)
+    .json({ message: "OTP status checked successfully." });
+};
+
 const verifyOtpController = async (req: Request, res: Response) => {
   const { phoneNumber, otp } = req.body;
   const { accessToken, refreshToken } = await verifyOtp(phoneNumber, otp);
@@ -48,6 +62,7 @@ const logoutController = async (req: Request, res: Response) => {
 
 export {
   sendOtpController,
+  checkOtpStatusController,
   verifyOtpController,
   refreshTokenController,
   logoutController,
diff --git a/apps/backend/src/modules/auth/auth.route.ts b/apps/backend/src/modules/auth/auth.route.ts
index 3e0ea45..b38ff42 100644
--- a/apps/backend/src/modules/auth/auth.route.ts
+++ b/apps/backend/src/modules/auth/auth.route.ts
@@ -1,7 +1,9 @@
 import { Router } from "express";
 import validateHandler from "@repo/backend/middlewares/validation";
+import rateLimitHandler from "@repo/backend/middlewares/rate-limit";
 import {
   sendOtpController,
+  checkOtpStatusController,
   verifyOtpController,
   refreshTokenController,
   logoutController,
@@ -10,22 +12,48 @@ import {
   sendOtpSchema,
   verifyOtpSchema,
   refreshTokenSchema,
+  statusOtpSchema,
 } from "./auth.schema";
 
 const authRouter = Router();
 
-authRouter.post("/send-otp", validateHandler(sendOtpSchema), sendOtpController);
+const sendOtpLimiter = rateLimitHandler({
+  endpoint: "/otp/send",
+  timeSpan: "5m",
+  limit: 5,
+  message: "Too many SMS messages have been sent to this number recently",
+});
 
 authRouter.post(
-  "/verify-otp",
+  "/otp/send",
+  sendOtpLimiter,
+  validateHandler(sendOtpSchema),
+  sendOtpController
+);
+
+const verifyOtplimiter = rateLimitHandler({
+  endpoint: "/otp/verify",
+  timeSpan: "5m",
+  limit: 5,
+});
+
+authRouter.post(
+  "/otp/status",
+  validateHandler(statusOtpSchema),
+  checkOtpStatusController
+);
+
+authRouter.post(
+  "/otp/verify",
+  verifyOtplimiter,
   validateHandler(verifyOtpSchema),
-  verifyOtpController,
+  verifyOtpController
 );
 
 authRouter.get(
   "/refresh-token",
   validateHandler(refreshTokenSchema),
-  refreshTokenController,
+  refreshTokenController
 );
 
 authRouter.get("/logout", logoutController);
diff --git a/apps/backend/src/modules/auth/auth.schema.ts b/apps/backend/src/modules/auth/auth.schema.ts
index d8bbe7d..2077b6f 100644
--- a/apps/backend/src/modules/auth/auth.schema.ts
+++ b/apps/backend/src/modules/auth/auth.schema.ts
@@ -6,6 +6,12 @@ const sendOtpSchema = z.object({
   }),
 });
 
+const statusOtpSchema = z.object({
+  body: z.object({
+    phoneNumber: z.string().min(10).max(15),
+  }),
+});
+
 const verifyOtpSchema = sendOtpSchema.extend({
   body: z.object({
     otp: z.string().min(6).max(6),
@@ -18,4 +24,4 @@ const refreshTokenSchema = z.object({
   }),
 });
 
-export { sendOtpSchema, verifyOtpSchema, refreshTokenSchema };
+export { sendOtpSchema, statusOtpSchema, verifyOtpSchema, refreshTokenSchema };
diff --git a/apps/backend/src/modules/auth/auth.service.ts b/apps/backend/src/modules/auth/auth.service.ts
index 7b5a14d..fefd6bd 100644
--- a/apps/backend/src/modules/auth/auth.service.ts
+++ b/apps/backend/src/modules/auth/auth.service.ts
@@ -13,7 +13,7 @@ import {
 
 const twilioClient = twilio(
   process.env.TWILIO_ACCOUNT_SID,
-  process.env.TWILIO_AUTH_TOKEN,
+  process.env.TWILIO_AUTH_TOKEN
 );
 
 const sendOtp = async (phoneNumber: string) => {
@@ -28,7 +28,7 @@ const sendOtp = async (phoneNumber: string) => {
       expiresAt,
     })
     .onConflictDoUpdate({
-      target: otps.phoneNumber, // The unique constraint column
+      target: otps.phoneNumber,
       set: { otp, expiresAt, updatedAt: new Date() },
     });
 
@@ -39,6 +39,18 @@ const sendOtp = async (phoneNumber: string) => {
   });
 };
 
+const checkOtpStatus = async (phoneNumber: string) => {
+  const otp = await db.query.otps.findFirst({
+    where: eq(otps.phoneNumber, phoneNumber),
+  });
+
+  if (!otp || otp.expiresAt < new Date()) {
+    throw new AuthError("OTP expired or invalid.");
+  }
+
+  return true;
+};
+
 const verifyOtp = async (phoneNumber: string, otp: string) => {
   const existingOtp = await db.query.otps.findFirst({
     where: eq(otps.phoneNumber, phoneNumber),
@@ -71,13 +83,16 @@ const verifyOtp = async (phoneNumber: string, otp: string) => {
   const refreshToken = jwtSignRefreshToken({ userId: user.id });
 
   const hashedToken = await argon2.hash(refreshToken);
-
-  await db.delete(refreshTokens).where(eq(refreshTokens.userId, user.id));
-
-  await db.insert(refreshTokens).values({
-    userId: user.id,
-    token: hashedToken,
-  });
+  await db
+    .insert(refreshTokens)
+    .values({
+      userId: user.id,
+      token: hashedToken,
+    })
+    .onConflictDoUpdate({
+      target: refreshTokens.userId,
+      set: { token: hashedToken, updatedAt: new Date() },
+    });
 
   return { accessToken, refreshToken };
 };
@@ -120,4 +135,4 @@ const logout = async (refreshToken: string) => {
   }
 };
 
-export { sendOtp, verifyOtp, refreshAccessToken, logout };
+export { sendOtp, checkOtpStatus, verifyOtp, refreshAccessToken, logout };
diff --git a/apps/backend/src/modules/auth/auth.test.ts b/apps/backend/src/modules/auth/auth.test.ts
index 573b276..5d55da6 100644
--- a/apps/backend/src/modules/auth/auth.test.ts
+++ b/apps/backend/src/modules/auth/auth.test.ts
@@ -31,12 +31,12 @@ describe("Auth API", () => {
     process.env.JWT_REFRESH_TOKEN_COOKIE_KEY = "refreshToken";
   });
 
-  describe("POST /send-otp", () => {
+  describe("POST /otp/send", () => {
     it("should send an OTP successfully", async () => {
       const phoneNumber = "1234567890";
 
       const res = await supertest(createServer())
-        .post("/api/v1/auth/send-otp")
+        .post("/api/v1/auth/otp/send")
         .set("Content-Type", "application/json")
         .send({ phoneNumber });
 
@@ -56,14 +56,14 @@ describe("Auth API", () => {
 
     it("should return 400 if phoneNumber is missing", async () => {
       const res = await supertest(createServer())
-        .post("/api/v1/auth/send-otp")
+        .post("/api/v1/auth/otp/send")
         .send({});
 
       expect(res.status).toBe(400);
     });
   });
 
-  describe("POST /auth/verify-otp", () => {
+  describe("POST /auth/otp/verify", () => {
     it("should verify OTP, create user if not exists, and return tokens", async () => {
       const phoneNumber = "1234567890";
       const otpCode = "123456";
@@ -76,7 +76,7 @@ describe("Auth API", () => {
       });
 
       const response = await supertest(createServer())
-        .post("/api/v1/auth/verify-otp")
+        .post("/api/v1/auth/otp/verify")
         .send({ phoneNumber, otp: otpCode });
 
       expect(response.status).toBe(201);
@@ -118,7 +118,7 @@ describe("Auth API", () => {
       });
 
       const response = await supertest(createServer())
-        .post("/api/v1/auth/verify-otp")
+        .post("/api/v1/auth/otp/verify")
         .send({ phoneNumber, otp: otpCode });
 
       expect(response.status).toBe(401);
@@ -137,7 +137,7 @@ describe("Auth API", () => {
       });
 
       const response = await supertest(createServer())
-        .post("/api/v1/auth/verify-otp")
+        .post("/api/v1/auth/otp/verify")
         .send({ phoneNumber, otp: otpCode });
 
       expect(response.status).toBe(401);
@@ -156,7 +156,7 @@ describe("Auth API", () => {
       });
 
       const response = await supertest(createServer())
-        .post("/api/v1/auth/verify-otp")
+        .post("/api/v1/auth/otp/verify")
         .send({ phoneNumber, otp: "123456" });
 
       expect(response.status).toBe(401);
diff --git a/packages/database/src/schema/auth.ts b/packages/database/src/schema/auth.ts
index 4f390f8..493cf9e 100644
--- a/packages/database/src/schema/auth.ts
+++ b/packages/database/src/schema/auth.ts
@@ -19,6 +19,7 @@ export const otps = pgTable("otps", {
 export const refreshTokens = pgTable("refresh_tokens", {
   id: integer().primaryKey().generatedAlwaysAsIdentity(),
   userId: integer()
+    .unique()
     .notNull()
     .references(() => users.id, { onDelete: "cascade", onUpdate: "cascade" }),
   token: text().notNull().unique(),