4. Brine

Brine is an order book private transaction DEX that implements private transactions through StarkWare's zk-STARK proof technology. It is designed with on-chain and off-chain dual components and is used to prove privacy and the validity of off-chain transactions being transmitted to the chain.

The mainnet was launched in June this year with a transaction volume of US$500 million. In September, it completed a US$16.5 million financing led by Pantera Capital at a valuation of US$100 million, with participation from StarkWare, Spartan Group and others.