Plastiq.com is a service that will charge your credit card and mail checks on your behalf. (With some vendors they also make electronic ACH payments.)
Their usual fee for this is 2.5%. It’s worth it to incur that fee if you’re earning a signup bonus with the credit card charges, or you’re meeting a spending threshold for a bonus.
Right now Mastercard payments are costing just 1.5%, and you can even pay a residential mortgage with a Mastercard.