gistfile1.php

class Payment extends Eloquent
{
    const PAID = 1;
    const PENDIND = 2;

    public function entry()
    {
        return $this->belongsTo('Entry', 'entry_id');
    }

    // ...
}

class Entry extends Eloquent
{

    public function payments($status = null)
    {
        $relation = $this->hasMany('Payment', 'entry_id');
        if ($status !== null) {
            $relation->where('status', $status);
        }
        return $relation;
    }

}

// Controller
$entries = Entry::payments(Payment::PAID)->get();

Pode criar metodos especificos também: tipo "pagamentosPagos":

class Entry extends Eloquent
{

    public function paidPayments()
    {
        return $this->hasMany('Payment', 'entry_id')->where('status', Payment::PAID);
    }

}

// Controller
$entries = Entry::paidPayments()->get();