The most realistic paper trading API
for developers

// First, get JWT token from API key
const tokenResponse = await fetch('https://api.paperinvest.io/v1/auth/token', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ apiKey: 'your_api_key' })
});
const { access_token } = await tokenResponse.json();

// Place a market order
const response = await fetch('https://api.paperinvest.io/v1/orders', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${access_token}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    accountId: 'your-account-id',
    portfolioId: 'your-portfolio-id',
    assetClass: 'EQUITY',
    symbol: 'AAPL',
    side: 'BUY_TO_OPEN',
    quantity: 100,
    type: 'MARKET',
    timeInForce: 'DAY'
  })
});

const order = await response.json();
console.log(`Order status: ${order.status}`);
console.log(`Filled at: $${order.avgFillPrice}`);

// Get real-time quote for a symbol
const quoteResponse = await fetch(
  'https://api.paperinvest.io/v1/market-data/quote/AAPL',
  {
    headers: {
      'Authorization': `Bearer ${access_token}`
    }
  }
);

const quote = await quoteResponse.json();
console.log(`Current price: $${quote.last}`);
console.log(`Bid: $${quote.bid} x ${quote.bidSize}`);
console.log(`Ask: $${quote.ask} x ${quote.askSize}`);

// Get batch quotes for multiple symbols
const batchResponse = await fetch(
  'https://api.paperinvest.io/v1/market-data/quotes/batch',
  {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${access_token}`,
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      symbols: ['AAPL', 'GOOGL', 'MSFT']
    })
  }
);