[fritz]

if you need sms numbers should you just use google voice

Thanks but I believe it can't do what I'm asking, I probably wasn't very clear:
I'm not looking for a normal SMS number to send/receive messages, I want a special SMS number that can only receive "paid" ones (those are not at the usual carrier rate but more expensive, mostly used by professionals for TV quiz and such). Thus to be able earn back some of that extra fee, only by receiving some SMS!

This is basically what the link above provides, and there are many others. But I couldn't find any with anonymous payment (ie crypto) of what you earn (and some are really vague about payments on their public website - but I believe if they'd use crypto it would be shown explicitly)