If the price of buying USDT in the C2C trading market is lower than its selling price, this seems to be an attractive arbitrage opportunity in theory. You can buy 1,000 USDT at a price of 7.31 and then sell it at a price of 7.36, easily earning a price difference of 0.05 times 1,000, which is 50 US dollars, which is approximately 368 yuan in RMB. This seemingly simple arbitrage operation seems to be able to continue in a loop and make continuous profits.

However, the market is not a fool, and any interest rate differences that exist have already been taken advantage of by savvy investors and tend to balance. So, why does this interest rate difference occur? One of the reasons may be that some merchants who use legal currency to purchase USDT are involved in illegal funds. They are willing to purchase USDT at a cost higher than the market price to clean the black money in their hands. In this case, you unintentionally become a tool for them to launder money.

In 2018 and earlier, the C2C market was relatively standardized. However, with the increase in criminal activities such as telecommunications fraud, more and more black money has begun to pour into the C2C market in the currency circle. In this regard, relevant departments are also intensifying their crackdown, freezing and investigating accounts suspected of black money. Black money is like an infectious disease, highly contagious and latent, and difficult to detect on the surface. Therefore, it brings two distinctive features: First, once a card receives black money, it will be "infected" and may face the risk of being frozen. The funds transferred from this card may also cause the new card to be "infected".

Secondly, before the funds are frozen, we often cannot determine which card or which amount of money has a problem. We can only know after the funds are frozen. This makes us face certain difficulties in preventing black money. So, how to deal with black money when withdrawing money? Here are some suggestions: First, choose merchants with large transaction volume, long registration time, and normal prices for transactions. Generally speaking, merchants with more than 2,000 transactions, registration time of more than one year, and prices lower than the market purchase price are relatively reliable. Merchants with small transaction volume, short registration time, and exorbitant prices may be at risk.

Secondly, use uncommon empty cards to collect payments and control the amount on a single card. Try to only transact with one merchant per card and isolate the funds received for 1-3 months.Doing so reduces the risk of funds being frozen due to merchant issues. Even if there is a freeze, it will be relatively easy to handle since the amount is spread out and the isolation period is long.

Overall, we need to remain vigilant and take appropriate preventive measures when facing the problem of black money. When choosing transaction objects and payment methods, be sure to choose carefully to ensure the safety of funds.

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