Minting USDJ with TRX can be a profitable venture, but it is not without risk. The most important factor to consider is the risk of the TRX price collapsing. If the price of TRX drops significantly, the value of the USDJ minted could be much lower than the TRX used to mint it. Therefore, it is important to be aware of the potential risks involved in this kind of venture.
In terms of arbitrage, the idea is to take advantage of price discrepancies between different exchanges. For example, if the price of USDJ is higher on one exchange compared to another, you can buy USDJ on the cheaper exchange and then sell it on the more expensive exchange for a profit. This kind of arbitrage requires careful monitoring of the prices on different exchanges and quick action when a price discrepancy is spotted. Additionally, you will need to factor in the fees associated with trading on the different exchanges, as well as the potential risk of price movements while you are in the process of making the trade.