Saber

Zero Impermanent Loss

Saber's StableSwap algorithm makes the assumption that assets in a pair will converge to the same price. As such, it does not have impermanent loss in the way that constant product AMMs do.

Note that there is still a risk of prices diverging from equilibrium: if one asset in the pool "de-pegs" (that is, drops or skyrockets in price permanently), a liquidity provider will experience impermanent loss. One should take care to research the underlying assets they are investing in.

Zero Opportunity Cost

There is an age-old debate of whether or not automated market makers are more efficient in providing liquidity than orderbooks.

There are two properties to measure the efficiency of liquidity: spread and depth. Spread refers to the difference between the bid (selling) price and the ask (buying) price, and depth refers to the total amount of volume that can be moved for a particular percentage of price decrease.

Constant product market makers like Uniswap V2 are very inefficient in liquidity provision, as they spread liquidity out over a large curve. For example: if $1,000,000 is allocated to the USDT-USDC pair evently, swapping 10,000 USDT to USDC results in a new price of $1.04 USDC.

Saber is different. The algorithm knows that USDT and USDC should be the same price, so you can expect a virtually zero change in price. As a result, liquidity providers are able to charge higher fees and more profit.