<a  href="javascript:void(0)" onclick="amount_pay('{{ $res->id}}');"><i class="fa fa-pencil-square-o"></i></a>

<script>

function amount_pay(id)
         {
            $.ajax({
            type: 'POST',
            url:  'amount_popup/'+ id,// calling the file  with id

            success: function (data) {
                alert(1);
            }
        });
      }
</script>

Route::post('amount_popup/{id}', 'AdminControllerAmountController@amount_to_pay');

public function amount_to_pay($id)
    {
        echo $id;
    }