[vasco_]

We are still trying to figure that out, there is no clear answer regarding how to base the pricing. Perhaps it should be based on words that were actually corrected? So for the time being we basing it only on source language words. For chinese, for example, we probably will do it based on characters, but ideas are welcome.

[logn]

I think only pricing the source language makes sense. That way the consumer knows the cost going in and there's no incentive for you to provide more verbose translations.