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For this kind of integration, personal money balance system have to be implemented. That is too complicated and was one of the choice whne Emerald was under architecture. This aproach was rejected.

It could be possible if as a currency you use user points or karma points. Users get karma when add something and loose when get something. At the end they can convert Karma points to cash.

But for that you will have to use Cobalt for blogs. Or you can use JS/ES if it can give karma to users that way. Then you do тещ туув Emerald at all. Although users will not be able to set how many points they want per article. It will be fixed amount. And you will have to find plugin that can convert Karma points to cache.

So the unswer is, no, we cannot help you much on that idea.