Currency exchange rate, how to pay 0.5 Exalt?

Hello everyone.
How to calculate the exchange rate correctly, since there are still few offers on the trading site. I can buy 1 exalt for 200 augmentation. And if the item is sold for 0.5 exalt, how much should you pay?

I think then you pay in chaos orbs ? :D At least thats what I did then.
It was 4 Chaos Orbs = 1 Exalted

But chaos orbs are rarer than exalted orbs so 4c = 1e doesn't make sense. Especially with today's patch where GGG has distributed chaos drop rates to other currencies.

Wait for the market to regulate to find out what 0.5e costs. I say skip anything in trade that costs 0.5e for now. If anything, they should list them as 10 transmute or 1 regal or anything else as long as it's not a decimal/fraction.