Why do they require an account …
I haven’t tried nostr:nprofile1qqs8msutuusu385l6wpdzf2473d2zlh750yfayfseqwryr6mfazqvmgpr9mhxue69uhhqun9d45h2mfwwpexjmtpdshxuet59uqjzamnwvaz7tmwdaehgu3dwfjkccte9e6x27rpwd5x2er8v5h8s7t69ue8f9pt yet but I think they just released a mobile app
Discussion
The only 2 that come to mind for that are Unleashed.Chat and I think nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg reposted someone who is using OpenAI with a Cashu Token for API calls, but you would have to build the interface for that I think