USDT is a version of the Tether stablecoin that operates on the Ethereum blockchain, standardized as an ERC20 token. The appearance of this version is due to the need to integrate the stablecoin into the Ethereum ecosystem, which allowed it to be used in smart contracts, decentralized applications (dApps), and other innovations developed on this blockchain. The story of its appearance begins with the success of the original token, which was issued on the Bitcoin blockchain using the Omni Layer protocol. However, the limitations of this protocol, such as low transaction speed and high fees, led to the search for more efficient solutions.