Relayers are all built on the 0x Protocol rather than on top of proprietary smart contracts. This allows us to participate in networked liquidity both with other relayers and with any other network participants. Anyone can build something around the 0x Protocol and immediately be able to tap into the whole network of liquidity.
Trustlessness and Auditability
Because we are not building the exchange contracts used to settle trades, there is far less trust required to use a relayer. The contracts handling the token settlement are independently created by the 0x team. Due to network effects, the 0x contracts are audited more regularly and with more scrutiny than proprietarily-created alternatives.
Wallet to Wallet Trading
With decentralized exchanges, you need to deposit ETH or tokens into their smart contracts prior to trading. Once you're done trading, you'll need to pull them back out into your wallet. This structure creates more transactions and therefore requires more fees in interacting with the Ethereum network. On Radar, enabling token allowances is a one-time event and you can keep wrapped ETH (WETH) in your wallet for as long as you'd like.
When you're trading with your Ledger device, you can sign and fill orders directly, creating the most secure trading experience possible.