Is money earned from trading "AXAT" halal, bearing in mind that an incident of fraud occurred on the part of another party and they refused to return the amount to him?

It is obligatory to return ill-gotten wealth to its owner. If it is impossible to reach the owner, then it must be given away in charity on their behalf. As for the profits generated from this wealth, there is a difference of opinion; however, the more cautious approach is to estimate them and either return them to the owner or give them away in charity on their behalf.