ZRX is a protocol running on the Ethereum blockchain that allows the exchange of ERC 20/721 tokens in a fully decentralized and low cost manner. To redeem these tokens today, most people turn to a centralized exchange which complicates the transaction. 0x uses what are called relayers who are responsible for disseminating pending orders through private or public order books. This makes it possible to bring liquidity to the network by hosting order books, as would a centralized exchange.
Unlike a centralized exchange, a relay cannot execute an order. It can only facilitate operations by introducing takers on the network. When a relay allows a trade to take place, he will be rewarded by receiving ZRX tokens. The relay will be paid for each successful transaction.
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