code: function getLumenPrice() {
    return Promise.all([
      rp('https://poloniex.com/public?command=returnTicker')
        .then(data => {
          return parseFloat(JSON.parse(data).BTC_STR.last);
        })
        .catch(() => {
          return null;
        })
      ,
      rp('https://bittrex.com/api/v1.1/public/getticker?market=BTC-XLM')
        .then(data => {
          return parseFloat(JSON.parse(data).result.Last);
        })
        .catch(() => {
          return null;
        })
      ,
      rp('https://api.kraken.com/0/public/Ticker?pair=XLMXBT')
        .then(data => {
          return parseFloat(JSON.parse(data).result.XXLMXXBT.c[0]);
        })
        .catch(() => {
          return null;
        })
    ])
    .then(allPrices => {
      return _.round(_.mean(_.filter(allPrices, price => price !== null)), 8);
    })
  }
docs: Get lumen price in terms of btc