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buyAmount to receive and the API returns the minimum sell amount required. Responses include maxSellAmount, estimatedNetSellAmount, and a route.refund leg that converts any buy-token surplus back to the sell token. Supports custom recipient and txOrigin parameters. See buyAmount in API reference./submit now allows multiple in-flight trades for the same taker and sell token, as long as the taker’s balance covers all pending sells.slippagePpm in Swap and Gasless API: Sub-BPS slippage precision is now supported via a new slippagePpm parameter (0–1,000,000). This is mutually exclusive with slippageBps — existing defaults and validations are unchanged. See more in API Reference.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 morewilliam@0xproject.com with the subject line “xStocks Opt-in”, and we’ll follow up with next steps./swap or /gasless request.maxSurplusBps parameter for controlling max acceptable surplus on returned trades.recipient parameter in both Swap and Gasless APIs (see API Reference.Interested in early access to the Solana or Cross-Chain APIs? Contact us to learn more.