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I need to listen ethereum transactions for current count of addresses using web3j. I know that I can use subscribe to get transactions, but how can I add some filter to listen a certain number of accounts?

Subscription subscription = web3j.transactionFlowable().subscribe(tx -> {// some code});
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If you want to listen to transactions on an account you can do the following:

web3j.transactionFlowable().filter({tx -> tx.to == "0xaddress" })

However, you should note that under the hood it will be getting every transaction using the rpc endpoint.

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