> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.0x.org/changelog/2025/1/31/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.0x.org/_mcp/server.

#### 📣 Announcements

* **Reminder**: API v1 will be sunset on **April 11, 2025**. To avoid service disruptions, migrate to v2 before this date. For more information, see the [Migration Guide](https://docs.0x.org/docs/upgrading/overview).

#### New Chains

* **Monad Testnet (10143)**: Added support for Swap API.

#### New Liquidity Sources

* **Arbitrum:** Added Fluid and swapr.
* **Base:** Added DeltaSwap, Kim V4, Rocket Swap, and SharkSwap.
* **Ethereum:** Added Sushiswap v3.
* **Linea:** Added Overnight.

#### Chores

* **Entry Point Contract Update**: The entry point contract address now supports the Uniswap v4 contract. Developers are strongly advised not to hardcode this address. Instead, use the value returned by `transaction.to` (see [API reference](https://docs.0x.org/api-reference/evm-ap-is/swap/allowanceholder-getprice)).
* **Avalanche Uppdated the Cancun hardfork**: This means that the AllowanceHolder address on Avalanche is now `0x0000000000001fF3684f28c67538d4D072C22734` (see [0x Settler changelog](https://github.com/0xProject/0x-settler/blob/master/CHANGELOG.md#2025-01-23)).

> Developer documentation for the 0x API. Embed swaps in your onchain app. Access 10+ million tokens with liquidity from 150+ exchanges with a single API.