It might be possible with something like nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg 's Cashu. I'm not an expert on this stuff by any means, but for the most part I think you need an address first to send a payment. From what I understand about Cashu, it creates a string that can be redeemed by anyone for sats, and thus can be given to someone without knowing their address or even while offline.