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Welcome to the Radar Relay Docs

This documentation covers everything you need to start trading programmatically on Radar Relay.
This includes the Radar Relay API, the Radar Relay SDK, and the 0x Standard Relayer API.

What you will need to start trading

Ethereum Node

Either a node service such as Infura, or run your own node.


Either an unlocked local node, or a light wallet.

REST API Experience

Experience working with REST APIs.

Fee Model

To reduce hurdles we’ve turned our fees to zero. Over time, we’ll turn our fees back to market rate.

How A Relayer is Different

If you’re new to relayers there are some key concepts to understand before using our documentation. First, relayers are wallet to wallet, which means you won’t be trading directly with an exchange operator. Instead, you’ll be trading directly with another peer. This means it’s a bit slower, but a lot safer. Second, there is no server to integrate with for executing trades. Instead, you’ll need to run your own copy of the blockchain on your computer. This local node will facilitate interactions with your private data and assets. Reading is free and writing involves keys/signing/transactions/fees.

Comparison of Radar Relay and Exchanges

Radar RelayExchange
Maintain Custody of Funds
No Trading Fees
No Account / Signup
Has an API?
Fast Trades

Radar Relay API Architecture

Our API is organized into four components: Feed API, Trading API, Ethereum Nodes, and the Radar Relay SDK. Radar Relay is also compliant with the 0x Protocol’s Standard Relayer API.

Fig.1 Relay Architecture

Radar Relay and the 0x Standard

Using the 0x SRA allows you to interface with any other relayers or dApps across the ecosystem.

Across decentralized trading venues there are varying degrees of trust. Using our SDK means you are using our market data and the information we store and determine internally. This places some trust in the hands of our servers, but also provides convenience.

The alternative to Radar Relay’s APIs and SDK are the trading tools built by the 0x Project team. The Standard Relayer API focuses on the blockchain being the source of truth for all trade information. This allows for less trust in a central server but is at the cost of some convenience.

Read More About the SRA

Comparison of Radar APIs and the SRA

Radar RelaySRA
Easy Setup
Provides Order State
Automatically Converts Ethereum Units (uint256)
Trade on all Relayers
Automatically Converts token units (token decimals)
Requires order state management on the clientside (see 0x order watcher)
Can rely exclusively on trustless trade data from Ethereum
Fig.2 0x SRA Architecture