function getPrice(today, callback){
    var url;
    var username = 'some username';
    var password = 'some password';
    url = 'some url'+ createTimeString(today);

    var options = {
        host: 'some host',
        path: url,
        auth: username + ':' + password
    };

    https.get(options, function(res){
        res.setEncoding('utf8');
        var body = '';

        res.on('data', function(d) {
            body += d;
            var obj = JSON.parse(body);
            console.log(obj);
            callback(obj.Entries[0].EntryPx);
        });

        res.on("end", function () {
            //console.log(body);
        });

        res.on('error', function(e) {
                context.fail("Got error: " + e.message);
        });
    });
}

getPrice(today, function(result) {
    curr_price = result;
    speechOutput = "The curr price is " + curr_price.toString();

    //rest of code
});