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What Bitcoin node do they pull? And how often would they - remids me of traffic reduction on certificate/revocation servers - same problem. Also there are many different slow/medium/fast fee estimations. Or how long does the mempool have to clear up for notifications to trigger.
It can be done for sure. But doing it such that it it's a good UX takes effort
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Some of them (Zeus) have it baked in
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Why don't wallets have this feature baked in, would make life so much easier