> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.0x.org/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.0x.org/_mcp/server.

#### New Features

* **Buy/Sell Tax Support**: Added support for Fee-on-Transfer tokens, which are subject to buy/sell taxes. Previously, users needed to adjust slippage tolerance manually to account for these taxes, often leading to errors. With the new fee-on-transfer accounting, slippage tolerance adjustments are no longer necessary. Additionally, the buy and sell tax are now returned, allowing users to utilize this information as needed.
* **Smart Contract Wallet Support**: Added support for Smart Contract Wallets in Swap API v2's Permit2 flow.
* **Gas Optimization**: Implemented gas optimizations for Solidly V3 integration.
* **Routing Improvements**: Significantly improved routing for `amphrETH` and `sDOLA`.

#### New Liquidity Sources

* **Arbitrum**: Enabled RFQ on Arbitrum in Swap API v2.
* **Base**: Added `SoSwap` and `Kinetix` as new liquidity sources on Base. Also enabled RFQ on Base in Swap API v2.
* **Ethereum**: Added support for `sDAI` coverage.
* **Optimism Integration**: Added `WOOFi` as a new liquidity source on Optimism.

> **Note**
>
> **Note:**
>
> *Want to add your liquidity source? Please fill out this [request form](https://forms.fillout.com/t/xrsvjHm85Hus).*

#### New Chains

* Preparation for **Linea** and **Scroll** support.

> **Note**
>
> **Note:**
>
> *Interested to build on Scroll and/or Linea? Reach out via our [contact form](https://0x.org/contact)!*