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It is a milliSat. And my impression is that only CLN is able to pay 1msat invoice from a CLN node to another CLN node connected straight through a channel.
coinos.io ignores msat, so does stacker.news wallet.
Ah, I see, I thought it was widely used, thanks for the correction! Take 10,000 mSats ;)
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It is widely used by any Lightning Network node, just that they mostly count the fees in milliSats and set the minHTLC to 1000 which is one Sat and so it is not possible to send one milliSat between many nodes. CLN has minHTLC set to 1 milliSat by default. Others can possibly do it as well, just that it is not the default setting.
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