const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.phaseo.app/v1/credits', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "ok": true,
  "credits": {
    "remaining": 15000000000,
    "balance_nanos": 15000000000,
    "reserved_nanos": 1000000000,
    "available_nanos": 14000000000,
    "thirty_day_usage": -250000000,
    "thirty_day_requests": 1250
  }
}