I'll help you build Justtrades with a cost-effective architecture. Here's the initial scaffold: NODE_ENV=development PORT=3001 DATABASE_URL=postgres://user:pass@localhost:5432/justtrades JWT_SECRET=your_jwt_secret_here STRIPE_SECRET_KEY=your_stripe_secret_key STRIPE_WEBHOOK_SECRET=your_stripe_webhook_secret ALPHA_VANTAGE_KEY=YWIK3JFTVS5HQ7F7 FINNHUB_KEY=d1reqqhr01qk8n66j7bgd1reqqhr01qk8n66j7c0 COINGECKO_KEY=CG-wc9NK1PCV3kuoTX9U3RpFBvn SENDGRID_API_KEY=your_sendgrid_key TELEGRAM_BOT_TOKEN=your_telegram_bot_token { "name": "justtrades-backend", "version": "1.0.0", "main": "index.js", "scripts": { "start": "node index.js", "dev": "nodemon index.js" }, "dependencies": { "axios": "^1.6.2", "bcryptjs": "^2.4.3", "cors": "^2.8.5", "dotenv": "^16.3.1", "express": "^4.18.2", "jsonwebtoken": "^9.0.2", "mongoose": "^8.0.3", "multer": "^1.4.5-lts.1", "pg": "^8.11.3", "stripe": "^13.3.0", "ws": "^8.13.0" }, "devDependencies": { "nodemon": "^3.0.2" } } const express = require('express'); const cors = require('cors'); const mongoose = require('mongoose'); const authRoutes = require('./routes/auth'); const alertRoutes = require('./routes/alerts'); const stripeRoutes = require('./routes/stripe'); const { setupWebSocket } = require('./websocket'); require('dotenv').config(); const app = express(); const PORT = process.env.PORT || 3001; // Middleware app.use(cors()); app.use(express.json()); // Database connection mongoose.connect(process.env.DATABASE_URL) .then(() => console.log('Connected to MongoDB')) .catch(err => console.error('MongoDB connection error:', err)); // Routes app.use('/api/auth', authRoutes); app.use('/api/alerts', alertRoutes); app.use('/api/stripe', stripeRoutes); // WebSocket setup const server = app.listen(PORT, () => { console.log(`Server running on port ${PORT}`); setupWebSocket(server); }); const express = require('express'); const bcrypt = require('bcryptjs'); const jwt = require('jsonwebtoken'); const User = require('../models/User'); const router = express.Router(); // Register user router.post('/register', async (req, res) => { try { const { email, password, tier } = req.body; const hashedPassword = await bcrypt.hash(password, 10); const user = new User({ email, password: hashedPassword, tier }); await user.save(); res.status(201).json({ message: 'User created' }); } catch (error) { res.status(500).json({ error: error.message }); } }); // Login user router.post('/login', async (req, res) => { try { const { email, password } = req.body; const user = await User.findOne({ email }); if (!user) return res.status(404).json({ error: 'User not found' }); const isMatch = await bcrypt.compare(password, user.password); if (!isMatch) return res.status(400).json({ error: 'Invalid credentials' }); const token = jwt.sign({ id: user._id }, process.env.JWT_SECRET, { expiresIn: '1h' }); res.json({ token, user: { email: user.email, tier: user.tier } }); } catch (error) { res.status(500).json({ error: error.message }); } }); module.exports = router; const express = require('express'); const axios = require('axios'); const router = express.Router(); const auth = require('../middleware/auth'); const Alert = require('../models/Alert'); // Get market data from Alpha Vantage router.get('/market-data/:symbol', auth, async (req, res) => { try { const { symbol } = req.params; const response = await axios.get( `https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=${symbol}&apikey=${process.env.ALPHA_VANTAGE_KEY}` ); res.json(response.data); } catch (error) { res.status(500).json({ error: error.message }); } }); // Generate AI alert router.post('/generate', auth, async (req, res) => { try { const { symbol, type } = req.body; const user = req.user; // Check user's alert limit based on tier const todayAlerts = await Alert.countDocuments({ userId: user.id, createdAt: { $gte: new Date().setHours(0, 0, 0, 0) } }); const maxAlerts = { 'Beginner': 2, 'Gainer': 3, 'Achiever': 5, 'Substantial': Infinity }[user.tier]; if (todayAlerts >= maxAlerts) { return res.status(403).json({ error: 'Daily alert limit reached' }); } // Fetch market data and apply AI logic const marketData = await fetchMarketData(symbol); const signals = analyzeSignals(marketData); const alert = new Alert({ userId: user.id, symbol, entryPrice: marketData.currentPrice, stopLoss: marketData.currentPrice * 0.97, target: marketData.currentPrice * 1.08, signals, confidence: signals.filter(s => s.matched).length }); await alert.save(); res.json(alert); } catch (error) { res.status(500).json({ error: error.message }); } }); async function fetchMarketData(symbol) { // Implementation for fetching and processing market data } function analyzeSignals(data) { // Implementation for AI signal analysis return [ { name: 'RSI > 50', matched: true }, { name: 'MACD bullish crossover', matched: true }, { name: 'Bollinger Band breakout', matched: false }, { name: 'Resistance breakout', matched: true }, { name: 'Volume surge', matched: true }, { name: 'OBV crossover', matched: false } ]; } module.exports = router; const express = require('express'); const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY); const User = require('../models/User'); const router = express.Router(); // Create Stripe checkout session router.post('/create-checkout-session', async (req, res) => { try { const { priceId } = req.body; const session = await stripe.checkout.sessions.create({ payment_method_types: ['card'], line_items: [{ price: priceId, quantity: 1, }], mode: 'subscription', success_url: `${process.env.FRONTEND_URL}/success?session_id={CHECKOUT_SESSION_ID}`, cancel_url: `${process.env.FRONTEND_URL}/cancel`, }); res.json({ url: session.url }); } catch (error) { res.status(500).json({ error: error.message }); } }); // Handle Stripe webhook router.post('/webhook', express.raw({type: 'application/json'}), async (req, res) => { const sig = req.headers['stripe-signature']; let event; try { event = stripe.webhooks.constructEvent( req.body, sig, process.env.STRIPE_WEBHOOK_SECRET ); } catch (err) { return res.status(400).send(`Webhook Error: ${err.message}`); } switch (event.type) { case 'checkout.session.completed': const session = event.data.object; await handleCheckoutSession(session); break; case 'customer.subscription.updated': const subscription = event.data.object; await handleSubscriptionUpdate(subscription); break; default: console.log(`Unhandled event type ${event.type}`); } res.json({ received: true }); }); async function handleCheckoutSession(session) { // Update user tier based on subscription } async function handleSubscriptionUpdate(subscription) { // Handle subscription changes } module.exports = router; const mongoose = require('mongoose'); const UserSchema = new mongoose.Schema({ email: { type: String, required: true, unique: true }, password: { type: String, required: true }, tier: { type: String, required: true, enum: ['Beginner', 'Gainer', 'Achiever', 'Substantial'], default: 'Beginner' }, kycVerified: { type: Boolean, default: false }, kycDocument: { type: String }, stripeCustomerId: { type: String }, subscriptionId: { type: String }, createdAt: { type: Date, default: Date.now } }); module.exports = mongoose.model('User', UserSchema); const mongoose = require('mongoose'); const AlertSchema = new mongoose.Schema({ userId: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true }, symbol: { type: String, required: true }, entryPrice: { type: Number, required: true }, stopLoss: { type: Number, required: true }, target: { type: Number, required: true }, signals: [{ name: String, matched: Boolean }], confidence: { type: Number, required: true }, createdAt: { type: Date, default: Date.now } }); module.exports = mongoose.model('Alert', AlertSchema); { "name": "justtrades-frontend", "version": "1.0.0", "private": true, "dependencies": { "@stripe/stripe-js": "^2.4.0", "axios": "^1.6.2", "chart.js": "^4.4.0", "react": "^18.2.0", "react-chartjs-2": "^5.2.0", "react-dom": "^18.2.0", "react-router-dom": "^6.18.0", "react-scripts": "5.0.1", "socket.io-client": "^4.7.2", "web-vitals": "^2.1.4" }, "scripts": { "start": "react-scripts start", "build": "react-scripts build", "test": "react-scripts test", "eject": "react-scripts eject" }, "eslintConfig": { "extends": [ "react-app", "react-app/jest" ] }, "browserslist": { "production": [ ">0.2%", "not dead", "not op_mini all" ], "development": [ "last 1 chrome version", "last 1 firefox version", "last 1 safari version" ] } } import React, { useState, useEffect } from 'react'; import { BrowserRouter as Router, Routes, Route } from 'react-router-dom'; import { ToastContainer } from 'react-toastify'; import 'react-toastify/dist/ReactToastify.css'; import AuthPage from './pages/AuthPage'; import Dashboard from './pages/Dashboard'; import AlertsPage from './pages/AlertsPage'; import SettingsPage from './pages/SettingsPage'; import Navbar from './components/Navbar'; import { AuthProvider } from './context/AuthContext'; import { io } from 'socket.io-client'; function App() { const [socket, setSocket] = useState(null); useEffect(() => { const newSocket = io('http://localhost:3001'); setSocket(newSocket); return () => newSocket.close(); }, []); return ( } /> } /> } /> } /> ); } export default App; import React, { useContext, useEffect, useState } from 'react'; import { useNavigate } from 'react-router-dom'; import { AuthContext } from '../context/AuthContext'; import AlertCard from '../components/AlertCard'; import { loadStripe } from '@stripe/stripe-js'; import axios from 'axios'; const Dashboard = ({ socket }) => { const { user } = useContext(AuthContext); const [alerts, setAlerts] = useState([]); const [loading, setLoading] = useState(true); const navigate = useNavigate(); useEffect(() => { if (!user) { navigate('/'); return; } const fetchAlerts = async () => { try { const res = await axios.get('/api/alerts'); setAlerts(res.data); } catch (err) { console.error(err); } finally { setLoading(false); } }; fetchAlerts(); if (socket) { socket.on('new-alert', (alert) => { setAlerts(prev => [alert, ...prev]); }); } return () => { if (socket) socket.off('new-alert'); }; }, [user, navigate, socket]); const handleUpgrade = async (priceId) => { const stripe = await loadStripe(process.env.REACT_APP_STRIPE_PUBLIC_KEY); const { data } = await axios.post('/api/stripe/create-checkout-session', { priceId }); await stripe.redirectToCheckout({ sessionId: data.id }); }; return (

Your Tier: {user?.tier}

{loading ? (

Loading alerts...

) : ( alerts.map(alert => ( )) )}

); }; export default Dashboard; import React from 'react'; import { Line } from 'react-chartjs-2'; import { Chart as ChartJS, CategoryScale, LinearScale, PointElement, LineElement, Title, Tooltip, Legend, } from 'chart.js'; ChartJS.register( CategoryScale, LinearScale, PointElement, LineElement, Title, Tooltip, Legend ); const AlertCard = ({ alert }) => { const chartData = { labels: ['Day 1', 'Day 2', 'Day 3', 'Day 4', 'Day 5'], datasets: [ { label: 'Price', data: [65, 59, 80, 81, 56], borderColor: 'rgb(75, 192, 192)', tension: 0.1 } ] }; return (

= 5 ? 'high-confidence' : ''}`}>

{alert.symbol}

{alert.confidence}/6 {alert.confidence === 6 && 🚀}

Entry: ${alert.entryPrice.toFixed(2)}

Stop Loss: ${alert.stopLoss.toFixed(2)}

Target: ${alert.target.toFixed(2)}

{alert.signals.map((signal, i) => ( {signal.name} ))}

); }; export default AlertCard; For deployment recommendations: 1. Backend: Vercel Serverless Functions (free tier) 2. Database: Supabase (free tier with PostgreSQL) 3. Frontend: Vercel (free tier) 4. Email: SendGrid free tier (100 emails/day) 5. Real-time data: Alpha Vantage free tier + CoinGecko free tier This setup keeps costs minimal while providing all core functionality. The backend uses Node.js with Express and MongoDB for flexibility. The frontend is React with real-time updates via WebSocket.