0x was founded in 2017 by Will Warren, and is one of the oldes decentralized exchanges. To date, 0x has raised $109 million dollars with their most recent Series B close which raised $70M by investors including Pantera Capital and Jump Crypto. 0x is a free-to-use Ethereum-based exchange that enables developers and businesses to build decentralized exchanges securely and quickly. By using 0x's open-source smart contracts, users can build trading protocols that enable direct non-custodial wallet-to-wallet trading between any ERC-20 and ERC-723 tokens.  The 0x network is powered by nodes that host an off-chain order book that facilitates transactions by using their ZRX token.