Neutral Dollar (NUSD) is a basket of index-like stablecoins initially composed of USDC, PAX, TUSD and DAI. It is generated by 100% pledge of component stablecoins through the Ethereum smart contract and allows free exchange between them. In the future, more mainstream stablecoins can be added to the pledge pool at any time according to market demand. The design of this index product enables it to effectively open up the liquidity between the constituent stablecoins across trading platforms. Compared with other single stablecoins, it has significant advantages in terms of arbitrage trading, risk hedging, and investment valuation, helping users reduce the cost of stablecoins. As the volatility of the pricing tool itself and the acceptance of risk diversification.