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const balancesResponse = await (
  await fetch(`https://api.jup.ag/ultra/v1/balances/3X2LFoTQecbpqCR7G5tL1kczqBKurjKPHhKSZrJ4wgWc`,
    {
      headers: {
        'x-api-key': 'your-api-key',
      },
    }
  )
).json();

console.log(JSON.stringify(balancesResponse, null, 2));

​
Balances Response

The balances response will return a list of token balances for the user’s wallet address. Successful example response: 
{
  "SOL": {
    "amount": "0",
    "uiAmount": 0,
    "slot": 324307186,
    "isFrozen": false
  }
}
Failed example response: 
{
  "error": "Invalid address"
}