0x
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ZRX · 5w

0x API /swap now supports 0x Protocol v4

0x API /swap now supports 0x Protocol v4 TL;DR v4 is the most powerful upgrade of the 0x Protocol, making it the most gas-efficient DEX protocol (up to 70% gas savings with RFQ liquidity). Users can expect more competitive liquidity from professional market makers and in turn better prices through 0x API. The default allowanceTarget returned by /swap/v1 has changed to 0xdef1c0ded9bec7f1a1670819833240f027b25eff. This allows us to lower costs for your end users by a measurable amount. The old allowance will be deprecated on March 31st. If you are a developer building with 0x API and consuming RFQ liquidity via /swap/v1, we encourage you to update the takerAddress to be a non-contract EOA address to ensure your continued access to RFQ liquidity. We will stop supporting /swap/v0 on March 31st.

The 0x API is designed to make it easy for DeFi developers like you to tap into both off-chain and on-chain DEX liquidity in a fast, reliable, and easy to use way so you can focus on what matters: your product. As of February 12th, 2020, the /swap/v1 endpoint supports 0x Protocol v4.

This version of the 0x Protocol is the most powerful update made to the protocol to date, turning it into the most gas-efficient DEX. As a result, users of applications built with 0x API can expect more gas efficient orders (up to 70% gas saved for RFQ orders and 10% for limit orders) and even better prices from 0x professional market makers.

If you are building with 0x API /swap/v1 , here’s what you need to know:

New allowanceTarget

The default allowanceTarget returned by /swap/v1 has changed to 0xdef1c0ded9bec7f1a1670819833240f027b25eff. This allows us to lower costs for your end users by a measurable amount:

However, we understand if you don’t want to migrate your users just yet. This is a soft change and the old allowance (0xf740b67da229f2f10bcbd38a7979992fcc71b8eb) will continue working until March 31st — when we deprecate it.

Upgrade takerAddress ...
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