0x (ZRX) is a cryptocurrency made by Amir Bandeali and Will Warren in 2016. It is a decentralized open protocol that enables the peer-to-peer exchange of assets on the Ethereum blockchain. The 0x protocol is used to power decentralized exchanges (DEXs).

Although 0x is not a DEX itself, it is a powerful protocol that allows developers to build DEXs on top of it. In today’s DEXs, the exchange is usually powered via smart contracts on-chain. This means that any time a user wishes to make a deposit, order or execute a trade, they will have to pay GAS fees at each step. Although DEXs offer security as the user maintains control of their funds, the GAS fees at each step can quickly add up, making DEXs unviable for profitable trading. 

0x aims to circumvent the blockchain bloat and high GAS fees through its protocol. The 0x protocol uses off-chain order relaying that allows users to only run transactions through the network when a trade is executed and thus reduces the overall GAS fees at each step. It does this by using “relayers” who are responsible for broadcasting orders through public or private order books. Basically, the relayers are those responsible for finding all the open orders and presents them to the network. For the trade to be executed, a taker must take the order and pay a compensation fee to the Relayer in 0x for facilitating the trade.

The 0x token is the cryptocurrency that powers the entire protocol. Relayers are paid in 0x. The tokens can also be used to make governance decisions on the network by holders.

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