Free Paper Trading API

// Get token with API key
const tokenRes = 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 tokenRes.json();

// Place a paper order
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',
    symbol: 'AAPL', quantity: 10, side: 'buy', type: 'market', timeInForce: 'day'
  })
});

import requests

# Get token
r = requests.post('https://api.paperinvest.io/v1/auth/token', json={ 'apiKey': 'YOUR_API_KEY' })
access_token = r.json()['access_token']

# Place order
headers = { 'Authorization': f'Bearer {access_token}', 'Content-Type': 'application/json' }
order = {
  'accountId': 'your-account-id',
  'portfolioId': 'your-portfolio-id',
  'symbol': 'MSFT', 'quantity': 5, 'side': 'buy', 'type': 'market', 'timeInForce': 'day'
}
requests.post('https://api.paperinvest.io/v1/orders', headers=headers, json=order)