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Curve achieves extremely efficient stablecoin trades by implementing the StableSwap invariant, which has significantly lower slippage for stablecoin trades than many other prominent invariants (e.g., constant-product). Note that in this context stablecoins refers to tokens that are stable representations of one another.
This includes, for example, USD-pegged stablecoins (like DAI and USDC), but also ETH and sETH (synthetic ETH) or different versions of wrapped BTC. For a detailed overview of the StableSwap invariant design, please read the official StableSwap whitepaper. A Curve pool is essentially a smart contract that implements the StableSwap invariant and therefore contains the logic for exchanging stable tokens. However, while all Curve pools implement the StableSwap invariant, they may come in different pool flavors. ...
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