Pools currently deployed on Curve are backed by centralized or decentralized stablecoins, wrapped tokens – such as wrapped bitcoin – or a basket of various assets. 4pool, however, will bring together UST and FRAX, the two largest decentralized stablecoins with a cumulative backing of over $19.6 billion, and USDT and USDC, the two largest centralized stablecoins, with a cumulative backing of $133 billion.
Source: https://www.coindesk.com/markets/2022/04/04/frax-finances-fxs-jumps-as-terra-introduces-stablecoin-pool-4pool/?utm_medium=referral&utm_source=rss&utm_campaign=headlines