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

# Additional Topics

> 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.

## Docs

- [Set Token Allowances](https://docs.0x.org/evm/0x-swap-api/additional-topics/how-to-set-your-token-allowances.md): Learn how to set token allowances when making swaps
- [Handle Native Tokens](https://docs.0x.org/evm/0x-swap-api/additional-topics/handling-native-tokens.md): This guide explains how to properly handle native tokens properly in swaps.
- [Chain-Specific Native Tokens](https://docs.0x.org/evm/0x-swap-api/additional-topics/chain-specific-native-tokens.md): How to handle native tokens on Mantle and Arc, the chains that do not follow the standard placeholder-address convention.
- [Display Final Swap Amounts](https://docs.0x.org/evm/0x-swap-api/additional-topics/0x-parser.md): This guide showcases how display final swapped amounts of a 0x transaction using the 0x-parser library.
- [Sell Entire Balance](https://docs.0x.org/evm/0x-swap-api/additional-topics/sell-entire-balance.md): Learn how to use the sellEntireBalance parameter in the 0x Swap API to automatically sell a taker’s full token balance at execution time.
- [Buy/Sell Tax Support](https://docs.0x.org/evm/0x-swap-api/additional-topics/buy-sell-tax-support.md): Learn best practices for how to implement 0x's buy/sell tax support.
- [Multi-Fee Support](https://docs.0x.org/evm/0x-swap-api/additional-topics/multi-fee-support.md): Collect fees for multiple recipients in a single swap using the Swap and Gasless APIs.
- [Swap and Send](https://docs.0x.org/evm/0x-swap-api/additional-topics/swap-and-send.md): Send swapped tokens directly to any address using the recipient parameter.
- [Exact Buy (Exact Out)](https://docs.0x.org/evm/0x-swap-api/additional-topics/exact-buy.md): Guarantee an exact output amount (exact out) for your swap using the buyAmount parameter.
- [RFQ System Overview](https://docs.0x.org/evm/0x-swap-api/additional-topics/about-the-rfq-system.md): Learn about 0x's RFQ liquidity, how it works, and how your project can apply to access it from the Swap API.