Assuming that deal is about an account trade,most of the reputed members wouldn't get involved.Hence your quest for finding a "trusted" middleman would never end.Moreover,what if the seller changes the account details after a day or two ? Or requests the account back from the service ? Escrow is useless in this trade.Seller should be okay with sending you the account details first as he knows the account details can be reset.
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You are most likely right.
But no one would trust me to send the account first that's the thing.
I didn't even know the account could be reset.

Isn't it possible to just change the email on the account?