<p></p>
<p><b>@chimp1984</b> commented on this pull request.</p>

<blockquote>
<p>utACK</p>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/chimp1984/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/chimp1984">@chimp1984</a> what was the reason for not waiting for the fee here? Seems like it should.</p>
</blockquote>
<p>I don't have the full context here, but I prefer to not add blocking code, but deal with asycn calls via callbacks. But if its API only and hard otherwise I am fine...</p><hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/4692#discussion_r511497625">core/src/main/java/bisq/core/offer/takeoffer/TakeOfferModel.java</a>:</p>
<pre style='color:#555'>> @@ -141,12 +160,19 @@ private void calculateTxFees() {
         // Payout tx: 371 bytes
         // Disputed payout tx: 408 bytes
 
-        // Request actual fees:
-        log.info("Start requestTxFee: txFeeFromFeeService={}", txFeeFromFeeService);
-        feeService.requestFees(() -> {
-            txFeePerByteFromFeeService = feeService.getTxFeePerByte();
-            txFeeFromFeeService = offerUtil.getTxFeeBySize(txFeePerByteFromFeeService, feeTxSize);
-        });
+        txFeePerByteFromFeeService = getTxFeePerByte();
+        txFeeFromFeeService = offerUtil.getTxFeeBySize(txFeePerByteFromFeeService, feeTxSize);
+        log.info("{} txFeePerByte = {}", feeService.getClass().getSimpleName(), txFeePerByteFromFeeService);
+    }
+
+    private Coin getTxFeePerByte() {
+        try {
+            CompletableFuture<Void> feeRequestFuture = CompletableFuture.runAsync(feeService::requestFees);
+            feeRequestFuture.get();  // Block until async fee request is complete.
</pre>
<p>I assume that method is only used by API so far. But to make it usable for GUI app as well a blocking request is not possible as it would block the UI thread. Is there a strong reason why you need to do it blocking and not via a callback/result handler design?</p>

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