O3 is an aggregation protocol of web3 that offers a universal liquidity solution for cross-chain trading. Their products include O3 Bridge, which enables interoperability and trustless AMM pools with native token liquidity, O3 Swap, which allows for asymmetric asset transactions across chains, and O3 Hub, an AMM-based native liquidity network. The company aims to support a wide range of chains and tokens, with a focus on scalability and transaction speed.