Merge pull request #193 from 0xProject/jlin/add-march-changelog

add March / early April changelog

Author: jlin27

fern/docs/changelog/2026-04-13.mdx

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+---
+tags: []
+---
+
+#### 📣 Announcements
+
+- **Cross-Chain API (Private Beta)**: The Cross-Chain API is now live in private beta. [Learn more and sign up](https://0x.org/products/cross-chain).
+
+#### New Chains
+
+- **Tron:** Now supported in Cross-Chain API.
+
+#### New Liquidity Sources
+
+- **Arbitrum:** Added Metric, CamelotV3, PancakeV3, UniV3.
+- **Avalanche:** Added Metric.
+- **Base:** Added Doppler (Uniswap V4), Feltir, Stabull, Wasabi, Liquid V2 hooks (Uniswap V4), Aquinas hook (Uniswap V4), cbBTC pool, Zora hook (Uniswap V4).
+- **BSC:** Added Elfomo, Lista Stable, Metric, Pancake Infinity CL.
+- **Ethereum:** Added Clober V2, DeFiSwap, DodoV2, Metric, Wasabi.
+- **HyperEVM:** Added Hybra V4, Nabla, UltraSolid V3.
+- **Monad:** Added BalancerV3.
+- **Optimism:** Added DackieSwap V3, Rubicon, Velodrome V2.
+- **Sonic:** Added Equalizer, Metro LB, Metro.
+
+#### New Features
+
+- **Smart account signatures in Gasless API:** Raw signatures from ERC-4337 smart wallets are now accepted in the Gasless API.
+- **`wrapUnwrapMode` in Swap API:** Controls how native wrap/unwrap trades are executed — direct (default) calls the wrapped-native contract directly, settler routes through Settler or AllowanceHolder for compatibility. [See more](https://docs.0x.org/api-reference/openapi-json/swap/allowanceholder-getprice#request.query.wrapUnwrapMode)