diff --git a/backend/test/contract.test.js b/backend/test/contract.test.js
new file mode 100644
index 0000000..9edc29a
--- /dev/null
+++ b/backend/test/contract.test.js
@@ -0,0 +1,222 @@
+import request from 'supertest';
+import app from '../src/server.js';
+import { pool } from '../src/db/connection.js';
+
+describe('API Contract Tests', () => {
+  let authToken;
+  let testUserId;
+
+  beforeAll(async () => {
+    // Clean up any existing test data
+    await pool.query('DELETE FROM users WHERE email = ?', ['test@example.com']);
+    
+    // Register a test user
+    const registerResponse = await request(app)
+      .post('/auth/register')
+      .send({
+        email: 'test@example.com',
+        password: 'password123',
+        displayName: 'Test User'
+      });
+    
+    expect(registerResponse.status).toBe(201);
+    authToken = registerResponse.body.token;
+    
+    // Get the user ID
+    const [rows] = await pool.query('SELECT id FROM users WHERE email = ?', ['test@example.com']);
+    testUserId = rows[0].id;
+  });
+
+  afterAll(async () => {
+    // Clean up test data
+    await pool.query('DELETE FROM users WHERE email = ?', ['test@example.com']);
+    await pool.end();
+  });
+
+  describe('Auth Endpoints', () => {
+    it('should register a new user', async () => {
+      const response = await request(app)
+        .post('/auth/register')
+        .send({
+          email: 'register-test@example.com',
+          password: 'password123',
+          displayName: 'Register Test User'
+        });
+      
+      expect(response.status).toBe(201);
+      expect(response.body).toHaveProperty('token');
+    });
+
+    it('should fail to register with invalid data', async () => {
+      const response = await request(app)
+        .post('/auth/register')
+        .send({
+          email: 'invalid-email',
+          password: 'short',
+          displayName: ''
+        });
+      
+      expect(response.status).toBe(400);
+    });
+
+    it('should login with valid credentials', async () => {
+      const response = await request(app)
+        .post('/auth/login')
+        .send({
+          email: 'test@example.com',
+          password: 'password123'
+        });
+      
+      expect(response.status).toBe(200);
+      expect(response.body).toHaveProperty('token');
+    });
+
+    it('should fail to login with invalid credentials', async () => {
+      const response = await request(app)
+        .post('/auth/login')
+        .send({
+          email: 'test@example.com',
+          password: 'wrongpassword'
+        });
+      
+      expect(response.status).toBe(401);
+    });
+  });
+
+  describe('Help Requests Endpoints', () => {
+    let helpRequestId;
+
+    it('should fetch all help requests', async () => {
+      const response = await request(app)
+        .get('/requests')
+        .set('Authorization', `Bearer ${authToken}`);
+      
+      expect(response.status).toBe(200);
+      expect(Array.isArray(response.body)).toBe(true);
+    });
+
+    it('should create a new help request', async () => {
+      const response = await request(app)
+        .post('/requests')
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          title: 'Test Help Request',
+          description: 'This is a test help request',
+          valueChf: 50.0
+        });
+      
+      expect(response.status).toBe(201);
+      expect(response.body).toHaveProperty('id');
+      helpRequestId = response.body.id;
+    });
+
+    it('should fail to create a help request with invalid data', async () => {
+      const response = await request(app)
+        .post('/requests')
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          title: 'T',
+          description: 'Short',
+          valueChf: -10
+        });
+      
+      expect(response.status).toBe(400);
+    });
+
+    it('should update a help request', async () => {
+      const response = await request(app)
+        .put(`/requests/${helpRequestId}`)
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          title: 'Updated Test Help Request',
+          description: 'This is an updated test help request',
+          valueChf: 75.0,
+          status: 'in_progress'
+        });
+      
+      expect(response.status).toBe(200);
+    });
+
+    it('should fail to update a help request with invalid data', async () => {
+      const response = await request(app)
+        .put(`/requests/${helpRequestId}`)
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          title: 'T',
+          description: 'Short',
+          valueChf: -10
+        });
+      
+      expect(response.status).toBe(400);
+    });
+
+    it('should delete a help request', async () => {
+      const response = await request(app)
+        .delete(`/requests/${helpRequestId}`)
+        .set('Authorization', `Bearer ${authToken}`);
+      
+      expect(response.status).toBe(200);
+    });
+  });
+
+  describe('Offers Endpoints', () => {
+    let offerId;
+
+    it('should fetch all offers', async () => {
+      const response = await request(app)
+        .get('/offers')
+        .set('Authorization', `Bearer ${authToken}`);
+      
+      expect(response.status).toBe(200);
+      expect(Array.isArray(response.body)).toBe(true);
+    });
+
+    it('should create a new offer', async () => {
+      // First create a help request to offer against
+      const requestResponse = await request(app)
+        .post('/requests')
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          title: 'Test Help Request for Offer',
+          description: 'This is a test help request for an offer',
+          valueChf: 50.0
+        });
+      
+      const helpRequestId = requestResponse.body.id;
+      
+      const response = await request(app)
+        .post('/offers')
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          helpRequestId,
+          description: 'This is a test offer',
+          valueChf: 45.0
+        });
+      
+      expect(response.status).toBe(201);
+      expect(response.body).toHaveProperty('id');
+      offerId = response.body.id;
+    });
+
+    it('should fail to create an offer with invalid data', async () => {
+      const response = await request(app)
+        .post('/offers')
+        .set('Authorization', `Bearer ${authToken}`)
+        .send({
+          helpRequestId: 99999,
+          description: 'Short',
+          valueChf: -10
+        });
+      
+      expect(response.status).toBe(400);
+    });
+
+    it('should delete an offer', async () => {
+      const response = await request(app)
+        .delete(`/offers/${offerId}`)
+        .set('Authorization', `Bearer ${authToken}`);
+      
+      expect(response.status).toBe(200);
+    });
+  });
+});
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