I've been living between 2 countries, so I change Steam region regularly.
Sometimes I'd have my wallet filled when doing the region change, I realized they'd auto convert my wallet credit when doing so.

I wanna know whether if Valve has their own conversion rate or not, I only care about are we getting ripped off if they do. I'd be more happy if the rate would work according to the reality exchange, perhaps XE Convert or Google. What is the conversion rate based on?