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

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/5582#discussion_r657679977">pricenode/src/main/java/bisq/price/spot/ExchangeRateProvider.java</a>:</p>
<pre style='color:#555'>>          super(refreshInterval);
         this.name = name;
         this.prefix = prefix;
+        this.env = env;
+    }
+
+    public Set<String> getSupportedFiatCurrencies() {
+        if (SUPPORTED_FIAT_CURRENCIES.size() == 0) {         // one-time initialization
</pre>
<p><code>.isEmpty()</code> is more expressive, same in line 84 <code>.filter(ccy -> !ccy.isEmpty())</code> and the crypto currency method</p>

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