<p><b>@ManfredKarrer</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/2251#discussion_r247491933">core/src/main/java/bisq/core/btc/TxFeeEstimationService.java</a>:</p>
<pre style='color:#555'>> +        // We start with min taker fee size of 260
+        int estimatedTxSize = 260;
+        try {
+            estimatedTxSize = getEstimatedTxSize(List.of(tradeFee, amount), estimatedTxSize, txFeePerByte, btcWalletService);
+        } catch (InsufficientMoneyException e) {
+            if (isTaker) {
+                // if we cannot do the estimation we use the payout tx size
+                estimatedTxSize = 380;
+            }
+            log.info("We cannot do the fee estimation because there are not enough funds in the wallet. This is expected " +
+                    "if the user pays from an external wallet. In that case we use an estimated tx size of {} bytes.", estimatedTxSize);
+        }
+
+        if (!preferences.isPayFeeInBtc()) {
+            // If we pay the fee in BSQ we have one input more which adds about 150 bytes
+            estimatedTxSize += 150;
</pre>
<p>Yes we can use a constant. It is just used once so thats why I did not use one and the class is small so easty to overlook all as well there is a comment decribing the value. But no problem to make a constant for it.</p>

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