The ClocX is distributed as freeware. However, if you wish to support its development and express your appreciation for the time and resources the author has spent developing and supporting it and help defer the costs of running the web servers, he will accept and appreciate your donation.
If you wish to make a donation, click on the PayPal icon below. PayPal is the best-known money service provider in this area. It accepts various credit cards and transfers from other PayPal accounts.
Other possible methods of donations are sending a cash by post or bank transaction (contact me for details in this case).