Can't get property value from object javascript

Trying to get data.rate value from data that looks like this:

{
  "timestamp": "2016-10-16T15:00:07Z",
  "error": "",
  "data": [{
    "pair": "EUR_USD",
    "rate": "1.09727328"
  }]
}

Console logging:

[{
    name: 'Bitfinex',
    rate: undefined
  },
  {
    name: 'Bitstamp',
    rate: undefined
  },
  {
    name: 'Gdax',
    rate: undefined
  }
]

I have also tried bracket notation rateResponse.data['rate'].

Full code:

Promise.all(cryptoxArray.map(cryptox =>
    new Promise((resolve, reject) =>

      cryptox.getRate({
          pair: "XBT_USD"
        }, (err, rateResponse) =>
        err ? reject(err) : resolve({
          name: cryptox.properties.name,
          rate: rateResponse.data.rate
        })
      )
    )
  ))
  .then(rates => console.log(rates));

via chuckieDub