diff --git a/tests/Infra/Services/ExchangeUsdToBtcService.php b/tests/Infra/Services/ExchangeUsdToBtcService.php
new file mode 100644
index 000000000..42b85d513
--- /dev/null
+++ b/tests/Infra/Services/ExchangeUsdToBtcService.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bavix\Wallet\Test\Infra\Services;
+
+use Bavix\Wallet\Internal\Service\MathServiceInterface;
+use Bavix\Wallet\Services\ExchangeServiceInterface;
+
+final class ExchangeUsdToBtcService implements ExchangeServiceInterface
+{
+    private array $rates = [
+        'USD' => [
+            'BTC' => 0.004636,
+        ],
+    ];
+
+    public function __construct(
+        private MathServiceInterface $mathService
+    ) {
+    }
+
+    public function convertTo(string $fromCurrency, string $toCurrency, float|int|string $amount): string
+    {
+        return $this->mathService->mul($amount, $this->rates[$fromCurrency][$toCurrency] ?? 1.);
+    }
+}
diff --git a/tests/Units/Domain/ExchangeTest.php b/tests/Units/Domain/ExchangeTest.php
index f4863a829..e17c9c060 100644
--- a/tests/Units/Domain/ExchangeTest.php
+++ b/tests/Units/Domain/ExchangeTest.php
@@ -4,11 +4,14 @@
 
 namespace Bavix\Wallet\Test\Units\Domain;
 
+use Bavix\Wallet\External\Dto\Extra;
 use Bavix\Wallet\Models\Transfer;
 use Bavix\Wallet\Services\ExchangeService;
 use Bavix\Wallet\Services\ExchangeServiceInterface;
+use Bavix\Wallet\Services\RegulatorServiceInterface;
 use Bavix\Wallet\Test\Infra\Factories\UserMultiFactory;
 use Bavix\Wallet\Test\Infra\Models\UserMulti;
+use Bavix\Wallet\Test\Infra\Services\ExchangeUsdToBtcService;
 use Bavix\Wallet\Test\Infra\TestCase;
 use Illuminate\Support\Str;
 
@@ -135,4 +138,57 @@ public function testExchange(): void
 
         self::assertSame(1 / 67.61, (float) $rate);
     }
+
+    public function testExchangeUsdToBtc(): void
+    {
+        app()->bind(ExchangeServiceInterface::class, ExchangeUsdToBtcService::class);
+
+        $rate = (float) app(ExchangeServiceInterface::class)
+            ->convertTo('USD', 'BTC', 1)
+        ;
+
+        self::assertSame(0.004636, $rate);
+
+        /** @var UserMulti $user */
+        $user = UserMultiFactory::new()->create();
+        $usd = $user->createWallet([
+            'name' => 'Dollar USA',
+            'slug' => 'my-usd',
+            'decimal_places' => 8,
+            'meta' => [
+                'currency' => 'USD',
+            ],
+        ]);
+        $btc = $user->createWallet([
+            'name' => 'Bitcoin',
+            'slug' => 'my-btc',
+            'decimal_places' => 8,
+            'meta' => [
+                'currency' => 'BTC',
+            ],
+        ]);
+
+        $usd->depositFloat(100.);
+        self::assertSame(100., $usd->balanceFloatNum);
+        self::assertSame(10000000000, $usd->balanceInt);
+
+        $usd->exchange($btc, 10000000000, new Extra(
+            deposit: [
+                'amountFloat' => 100 * $rate,
+            ],
+            withdraw: [
+                'amountFloat' => -100.,
+            ],
+        ));
+
+        app(RegulatorServiceInterface::class)->missing($usd);
+        app(RegulatorServiceInterface::class)->missing($btc);
+
+        // get data from database
+        $usd->refresh();
+        $btc->refresh();
+
+        self::assertSame(0, $usd->balanceInt);
+        self::assertSame(100 * $rate, $btc->balanceFloatNum);
+    }
 }