class Bank(models.Model):
    # ...
    payout = models.DecimalField(
        _('payout'),
        max_digits=8,
        decimal_places=2,
        default=0.00
    )
    # ...

bank = Bank.objects.get(user=request.user)
payout = bank.payout

TypeError at /cabinet/payout/
Decimal('18.92') is not JSON serializable