Many people are confused about the difference between U Card and OTC (C2C), but in fact, the two are completely different.

When using U cards for consumption, what you spend is neither USDT nor USDC, but real fiat currency. Currently, there are roughly four types of U cards available in the market:

The first type is the most traditional model - when you top up your card, it triggers an operation similar to "transfer." The system will automatically convert your USDT into USD or other fiat currencies, essentially performing a currency exchange. Once this process is completed, what lies in your card are traditional currencies like dollars and euros.

In simple terms, the U Card is more like a combination tool for "automatic currency exchange + payment," which is completely different from the logic of trading directly with stablecoins.