Laeserin on Nostr: They use - `cryptocurrency_addresses`: A JSON object containing cryptocurrency names ...

They use
- `cryptocurrency_addresses`: A JSON object containing cryptocurrency names and their corresponding addresses, like the following example: `{"bitcoin":"bc1q...","monero":"888tN...",...}`

quoting nevent1q…phdr

https://github.com/nostr-protocol/nips/pull/1812

Garnet and mostard use this, but they only allow adding and removing the monero field.
Using this you could add any form of payment you want and clients could list it on your profile