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function getETHBalance(ethAddress) {
  var response = UrlFetchApp.fetch('https://api.etherscan.io/api?module=account&action=balance&address=' + ethAddress + '&tag=latest&apikey=UMBMA6SZ3DUAWW9C3NGRMRASSNNWRIPV51');
  var json = response.getContentText();
  var data = JSON.parse(json);
  return data.result * Math.pow(10,-18);
}

function getTokenBalance(symbol, ethAddress) {
  var response = UrlFetchApp.fetch('https://api.ethplorer.io/getAddressInfo/' + ethAddress + '?apiKey=freekey');
  var json = response.getContentText();
  var data = JSON.parse(json);
  var tokenData = {};
  for each (var token in data.tokens) {
    if (token.tokenInfo.symbol == symbol) {
      tokenData = token;
    }
  }
  
  var decimals = parseInt(tokenData.tokenInfo.decimals, 10);
  var divisor = Math.pow(10, decimals);
  var balance = parseFloat(parseFloat(tokenData.balance).toFixed());
  var result = balance/divisor;
  return result;
}