If you put a XMR address in your profil bio a client like nostr:nprofile1qqsg68209ppjt3m72hax0g538xy2d9lgqc8ce3f76rl4gsymqee3cssppemhxue69uhkummn9ekx7mp0qyt8wumn8ghj7mn0wd68ytncd4ezuun0vd4hxtcpzamhxue69uhhsmtj9e6hxetwdaehgu3wdaexwtcta6z3z can read that and users there can zap you. If you don't want it in your bio in nosmero you can add an address in the settings. I did both😁