Curve

Curve is built for swapping assets that should trade near parity, such as two stablecoins or a token and its staked version. Its pricing formula keeps slippage very low near the peg and widens sharply away from it, which suits that job and suits little else.

It was one of the most important protocols in DeFi's growth and its Base deployment is small relative to its Ethereum presence. Curve runs on more than thirty chains.