Quote from: Tuco1954 on Today at 10:16:59 AM

Is there a good source where I can read about it (I mean what is ETA, mempool fees, why 2700 bytes considered a big sized transaction)?

The ETA feature is like Bitcoin Core's floating fees which estimates the number of blocks it takes before the transaction gets included. It's more expensive than mempool as it takes a more conservative estimates based on the recent trend with the mempool and/or the fees paid by the transactions included by blocks. Mempool is a more up to date method to estimate the fees as it takes the current conditions as it is; each blocks takes 1vMB of the top paying transactions by fees/size and having a transaction with fees that puts it under that 1vMB threshold will probably result in your transaction being included in a block if it a block is mined immediately. Mempool is not the most accurate as it cannot take into account the possibility of blocks having a longer interval, etc.

2700bytes is fairly big. You likely have a lot of inputs which results in a larger transaction. A typical 1 input and 2 output bech32 transaction is about 142 (virtual)bytes. You'd want to consolidate[1] your unspent output often to have a smaller transaction size.

[1] https://bitcointalk.org/index.php?topic=2848987.0