Subscription Policy MarketCalendar.com market alerting system is available on a trial basis with limited functionality. To utilize the trial service you do not need to supply credit card info. However, by selecting the trial option you are authorizing Marketcalendar to include potential ads as part of the alerting service. Paid subscribers will not have ads within the alerts. You may cancel at any time during your subscription. However refunds are only applicable to yearly subscribers and will be prorated. If for any reason you decide you do not wish to continue, notify us at service@MarketCalendar.com and your subscription will be canceled.. For paid subscription we accept Visa, Mastercard and Discover.