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 How does @keychat work? Does it require e-cash for each message sent? 
 #yestr and it uses the signal protocol. it also spins up new key pairs for you, so you can’t use your existing nostr keys. 
 Keychat relay requires ecash sat stamp. 

Users can also choose free relay. https://image.nostr.build/27854099097f3fbd2f1649f7efe0948993b02a9d34be0cbacd5583d2692cb2fc.jpg  
 Can non keychat apps pay ecash stamps to write to the keychat relay? 
 Yes, but the Keychat relay does not accept public notes (kind 1).