Sphinx chat (https://buy.sphinx.chat/) still works and handle paid content very smoothly and flexibly.
You can pay (₿ over Lightning⚡️) and folks can pay subscriptions which are paid directly to your Sphinx account (peer-to-peer).
Seriously. It's so far ahead of NOSTR in this regard that it's not even worthy of comparison.
DM me and I'll set you up with a Lite node.
It costs a one-time fee of 3000 ṩats (less than $1 USD at today's rates).
My Sphinx ID:
022bb41d512e5d265b0073ac78428d522a4637f6c94d7bda8a6840d00ac3965814:02736e7dad83d7205826649fc17db672ce08f8e87a2b47c7785ccbf79f24e91db0:1099657510913