>What I want, is to give a merchant a credit card number, pre load that number with $30, have them charge it, and then be completely done with it. This especially makes sense for low stakes low cost recurring monthly payments. I should just be able to stop paying a $5/month fax service that I never use, and have them terminate my service. Banks would never let you do that. Services that used to let you do that have been mostly shut down.

Privacy.com offers this service, but you have to pay from your bank account.