As DOI is the world's leading blockchain intelligent quantitative trading platform, its business scope covers many countries around the world. At the same time, all country in the world uses different legal currency, so DOI hereby uses the United States dollar for settlement

USDT as a token of the US dollar, is equivalent in value to the US dollar and is the most common stable digital asset in the world. It makes the DOI settlement system more efficient. When users withdraw the USDT, they can exchange it for their own legal tender in their digital wallet