diff --git a/src/features/auth/api/calls/index.ts b/src/features/auth/api/calls/index.ts
index ce51756..d030e96 100644
--- a/src/features/auth/api/calls/index.ts
+++ b/src/features/auth/api/calls/index.ts
@@ -1,3 +1,4 @@
 export * from "./login";
 export * from "./register";
 export * from "./logout";
+export * from "./refresh";
diff --git a/src/features/auth/api/calls/refresh/constants.ts b/src/features/auth/api/calls/refresh/constants.ts
new file mode 100644
index 0000000..99cadcb
--- /dev/null
+++ b/src/features/auth/api/calls/refresh/constants.ts
@@ -0,0 +1,3 @@
+export const REFRESH_API_ROUTE = "auth/refresh";
+export const MOCK_TOKEN = "mock.access.token";
+export const MOCK_FRESH_TOKEN = "mock.fresh.access.token";
diff --git a/src/features/auth/api/calls/refresh/index.ts b/src/features/auth/api/calls/refresh/index.ts
new file mode 100644
index 0000000..1f69e73
--- /dev/null
+++ b/src/features/auth/api/calls/refresh/index.ts
@@ -0,0 +1,2 @@
+export { refresh } from "./refresh";
+export { REFRESH_API_ROUTE } from "./constants";
diff --git a/src/features/auth/api/calls/refresh/refresh.mock.ts b/src/features/auth/api/calls/refresh/refresh.mock.ts
new file mode 100644
index 0000000..ca4cc7a
--- /dev/null
+++ b/src/features/auth/api/calls/refresh/refresh.mock.ts
@@ -0,0 +1,22 @@
+import { http, HttpResponse } from "msw";
+import { BASE_URL } from "shared/config";
+import { MOCK_FRESH_TOKEN, MOCK_TOKEN, REFRESH_API_ROUTE } from "./constants";
+
+const REFRESH_URL = `${BASE_URL}/${REFRESH_API_ROUTE}`;
+
+/**
+ * Msw interceptor. Mocks the refresh endpoint response.
+ * Validates the Authorization header — returns a fresh token on success, 401 on expired/missing session.
+ */
+export const refreshMock = http.post(REFRESH_URL, ({ request }) => {
+  const authHeader = request.headers.get("Authorization");
+
+  if (authHeader === `Bearer ${MOCK_TOKEN}`) {
+    return HttpResponse.json({
+      accessToken: MOCK_FRESH_TOKEN,
+      user: { id: "1", email: "test@test.com" },
+    });
+  }
+
+  return HttpResponse.json({ message: "Session expired" }, { status: 401 });
+});
diff --git a/src/features/auth/api/calls/refresh/refresh.spec.ts b/src/features/auth/api/calls/refresh/refresh.spec.ts
new file mode 100644
index 0000000..f8e6ea7
--- /dev/null
+++ b/src/features/auth/api/calls/refresh/refresh.spec.ts
@@ -0,0 +1,33 @@
+import { setupServer } from "msw/node";
+import { useAuthStore } from "../../../model";
+import { refresh } from "./refresh";
+import { refreshMock } from "./refresh.mock";
+import { MOCK_FRESH_TOKEN, MOCK_TOKEN } from "./constants";
+
+const server = setupServer(refreshMock);
+
+describe("refresh", () => {
+  beforeAll(() => server.listen({ onUnhandledRequest: "error" }));
+  afterEach(() => {
+    server.resetHandlers();
+    useAuthStore.setState({ accessToken: undefined });
+  });
+  afterAll(() => server.close());
+
+  describe("happy path", () => {
+    it("returns a fresh access token and user when session is valid", async () => {
+      useAuthStore.setState({ accessToken: MOCK_TOKEN });
+
+      const result = await refresh();
+
+      expect(result.accessToken).toBe(MOCK_FRESH_TOKEN);
+      expect(result.user).toEqual({ id: "1", email: "test@test.com" });
+    });
+  });
+
+  describe("error cases", () => {
+    it("throws when session is expired or missing", async () => {
+      await expect(refresh()).rejects.toThrow();
+    });
+  });
+});
diff --git a/src/features/auth/api/calls/refresh/refresh.ts b/src/features/auth/api/calls/refresh/refresh.ts
new file mode 100644
index 0000000..d69d7d6
--- /dev/null
+++ b/src/features/auth/api/calls/refresh/refresh.ts
@@ -0,0 +1,7 @@
+import { api } from "../../../api";
+import type { AuthResponse } from "../../../model/types/service";
+import { REFRESH_API_ROUTE } from "./constants";
+
+export function refresh() {
+  return api.post(REFRESH_API_ROUTE).json<AuthResponse>();
+}