There used to be an American Express office in Quito… not at all sure they are still there. But I arranged cash through them way back when. Also, at Banco Internacional at Quicentro Mall they will give you cash against your credit card. The Bancon Internacional ATM machines are the only ones I’ve found that regularly dispense $500 at a pop. And those may only be in selected sites, like the hospital or mall where you might seriously need that much cash.