I think nostr:npub1jq9dx5dp5lg6t42ugpkd0se9uf5809mw849m0euzwf6h0wcjvtxs069lgq did it first no?

USD stable is provided by stable channel. (Lightning channel between 2 parties balancing sats every 5 mins based on exchange rate). The real balances of stable channel and cashu Mint liabllities are shown in real-time on the mint website https://stablenut.umint.cash

lmk for questions.

Thanks bob

And there is also a lightning address to receive stable-ecash:

657bf19cf850ec22b85986d5438a353e1f18c44d21dc8a576afa111775fc4e2d@boardwalkcash.com

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