In my case whenever i receive or send usd using webmoney. It sends me email that this amount received from this account number etc. I think it is possible.
That's covering one specific sort of trade (currency exchange), and not even all of those (what about btc to alt exchanges, wire transfers, cash in mail,...).
You're letting out all purchases of digital goods, aswell as physical ones (for example the collectibles section, which has a decent junk of trades done on this forum).
And even then, the "AI" could only determine two cases, a) trade gone well and b) trade failed.
It wouldn't be abled to mediate in any situation that isn't 100% clear.