gistfile1.txt

/**
 * @throws AdressApiDown
 */
public function validate($value, Constraint $constraint): void
{
    try {
      if ($someService->checkValue($value)) {
          $this->context
              ->buildViolation($constraint->message)
              ->addViolation();
        }
    } catch (\Exception $exception) {
        throw new AdressApiDown('...', 0 , $exception);
    }
}

// Controller
try {
    $validator->validate($adress);
} catch (AdressApiDown $e) {
    return new JsonResponse(['error' => 'Adress API down, try later.'], 503);
}