crypto_price_history.js

// Copy paste this into the JS console of any window that has loaded
// https://coinmarketcap.com/

var CURRENCY = 'bitcoin';


var w = window.open('https://coinmarketcap.com/currencies/' + CURRENCY + '/historical-data/?start=20000101&end=20170806');

w.addEventListener('load', function () {
  var rows = $(w.document.getElementById('historical-data')).find('tr');
  var data = [];
  for (var i = 1; i < rows.length; i++) {
    var items = $.map($(rows[i]).find('td'), function (td) {
      return td.innerText;
    });
    data.push({
      date: (new Date(items[0])).getTime(),
      open: items[1],
      high: items[2],
      low: items[3],
      close: items[4]
    });
  }
  w.document.write(JSON.stringify(data))
}, true);