Yes. Sponsors pay for sponsorship purchases with credit cards only. All purchases are currently in US Dollars. Tinysponsor uses secure credit card processing technologies from Braintree, a Paypal company, along with all their best practices and standards.
In addition, Sponsors can also use different credit cards to to pay for sponsorship purchases. This is especially handy for Sponsors who manage multiple brands and using different credit cards to purchase sponsorships for each.
Add credit cards by clicking on the Tinysponsor account name on the top right corner to get to the dashboard, and then selecting Payment Options under Buying.