ideally bitcoin, of course, but anything 1-off would do; for instance something available as a gift card like Google Play credits, Amazon, etc for trial purpos

ideally bitcoin, of course, but anything 1-off would do; for instance something available as a gift card like Google Play credits, Amazon, etc for trial purposes, they could just extend the free trial usage limits I have using their web prompt to the API for me introducing my CC data there is a serious expense, much more than a few dollars