diff --git a/src/Entity/QRCode/QRCodeMoney.php b/src/Entity/QRCode/QRCodeMoney.php
index 3485300..b822f07 100644
--- a/src/Entity/QRCode/QRCodeMoney.php
+++ b/src/Entity/QRCode/QRCodeMoney.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace App\Entity\QRCode;
 
 use App\Validator\Currency;
+use App\Validator\Money;
 use Symfony\Component\Validator\Constraints as Assert;
 
 /**
@@ -15,6 +16,7 @@ class QRCodeMoney
         message: 'messages.not_valid_amount',
     )]
     #[Assert\NotBlank(message: 'messages.fill_value')]
+    #[Money(message: 'messages.not_valid_amount')]
     private ?string $amount;
 
     // TODO: getCurrencies validation
diff --git a/src/Validator/Money.php b/src/Validator/Money.php
new file mode 100644
index 0000000..b214978
--- /dev/null
+++ b/src/Validator/Money.php
@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Validator;
+
+use Symfony\Component\Validator\Constraint;
+
+#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class Money extends Constraint
+{
+    public const NOT_CURRENCY_ERROR = '478618e7-95ba-473d-9101-cabd45e49115';
+
+    protected const ERROR_NAMES = [
+        self::NOT_CURRENCY_ERROR => 'NOT_CURRENCY_ERROR',
+    ];
+
+    public string $message = 'This value should be currency.';
+
+    /**
+     * @param mixed|null $options
+     * @param string|null $message
+     * @param array<string>|null $groups
+     * @param mixed|null $payload
+     */
+    public function __construct(mixed $options = null, string $message = null, array $groups = null, mixed $payload = null)
+    {
+        parent::__construct($options ?? [], $groups, $payload);
+
+        $this->message = $message ?? $this->message;
+    }
+}
diff --git a/src/Validator/MoneyValidator.php b/src/Validator/MoneyValidator.php
new file mode 100644
index 0000000..1a18c04
--- /dev/null
+++ b/src/Validator/MoneyValidator.php
@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Validator;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+class MoneyValidator extends ConstraintValidator {
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof Money) {
+            throw new UnexpectedTypeException($constraint, Money::class);
+        }
+
+        if (null === $value || '' === $value) {
+            return ;
+        }
+
+        if (is_string($value) === false) {
+            throw new UnexpectedValueException($value, "string");
+        }
+
+        if (preg_match('/^\d+([\.,]\d{0,2})?$/', $value)) {
+            return ;
+        }
+
+        $this->context->buildViolation($constraint->message)
+            ->setParameter('{{ string }}', $value)
+            ->addViolation();
+    }
+}
diff --git a/tests/Validator/MoneyValidatorTest.php b/tests/Validator/MoneyValidatorTest.php
new file mode 100644
index 0000000..a234620
--- /dev/null
+++ b/tests/Validator/MoneyValidatorTest.php
@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Validator;
+
+use App\Validator\Money;
+use App\Validator\MoneyValidator;
+
+class MoneyValidatorTest extends ValidatorTestCase
+{
+    /**
+     * @dataProvider successDp
+     * @param string $generatedValue
+     * @return void
+     */
+    public function testSuccess(string $generatedValue): void {
+        $moneyValidator = new MoneyValidator();
+        $moneyValidator->initialize($this->createExecutionContext(false));
+        $moneyValidator->validate($generatedValue, new Money(['message' => 'foo']));
+    }
+
+    private function successDp(): array {
+        return [['122'], ['122.0'], ['122,00'], ['122'], ['2.05'], ['2,04']];
+    }
+
+    /**
+     * @dataProvider failureDp
+     * @param string $generatedValue
+     * @return void
+     */
+    public function testFailure(string $generatedValue): void {
+        $moneyValidator = new MoneyValidator();
+        $moneyValidator->initialize($this->createExecutionContext(true));
+        $moneyValidator->validate($generatedValue, new Money(['message' => 'foo']));
+    }
+
+    private function failureDp(): array {
+        return [['122.b'], ['a.a'], ['a'], ['2.040'], ['2,a']];
+    }
+}