# UNDF: UNDF-2026-000000925
--- a/lib/exchange/utils/currency_pairs_utils.dart
+++ b/lib/exchange/utils/currency_pairs_utils.dart
@@ -1,12 +1,13 @@
 import 'package:cake_wallet/exchange/exchange_pair.dart';
 import 'package:cw_core/crypto_currency.dart';

 List<ExchangePair> supportedPairs(List<CryptoCurrency> notSupported) {
+  final notSupportedSet = notSupported.toSet();
   final supportedCurrencies =
-      CryptoCurrency.all.where((element) => !notSupported.contains(element)).toList();
+      CryptoCurrency.all.where((element) => !notSupportedSet.contains(element)).toList();

   return supportedCurrencies
       .map((i) => supportedCurrencies.map((k) => ExchangePair(from: i, to: k, reverse: true)))
       .expand((i) => i)
       .toList();
 }
--- a/lib/buy/pairs_utils.dart
+++ b/lib/buy/pairs_utils.dart
@@ -11,8 +11,10 @@
 List<TradePair<CryptoCurrency, FiatCurrency>> supportedCryptoToFiatPairs({
   required List<CryptoCurrency> notSupportedCrypto,
   required List<FiatCurrency> notSupportedFiat,
 }) {
+  final notSupportedCryptoSet = notSupportedCrypto.toSet();
+  final notSupportedFiatSet = notSupportedFiat.toSet();
   final supportedCrypto =
-      CryptoCurrency.all.where((crypto) => !notSupportedCrypto.contains(crypto)).toList();
-  final supportedFiat = FiatCurrency.all.where((fiat) => !notSupportedFiat.contains(fiat)).toList();
+      CryptoCurrency.all.where((crypto) => !notSupportedCryptoSet.contains(crypto)).toList();
+  final supportedFiat = FiatCurrency.all.where((fiat) => !notSupportedFiatSet.contains(fiat)).toList();

   return supportedCrypto
       .expand((crypto) => supportedFiat
@@ -25,8 +27,10 @@
 List<TradePair<FiatCurrency, CryptoCurrency>> supportedFiatToCryptoPairs({
   required List<FiatCurrency> notSupportedFiat,
   required List<CryptoCurrency> notSupportedCrypto,
 }) {
-  final supportedFiat = FiatCurrency.all.where((fiat) => !notSupportedFiat.contains(fiat)).toList();
+  final notSupportedFiatSet = notSupportedFiat.toSet();
+  final notSupportedCryptoSet = notSupportedCrypto.toSet();
+  final supportedFiat = FiatCurrency.all.where((fiat) => !notSupportedFiatSet.contains(fiat)).toList();
   final supportedCrypto =
-      CryptoCurrency.all.where((crypto) => !notSupportedCrypto.contains(crypto)).toList();
+      CryptoCurrency.all.where((crypto) => !notSupportedCryptoSet.contains(crypto)).toList();

   return supportedFiat