> For the complete documentation index, see [llms.txt](https://docs.unizen.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unizen.io/api-introduction.md).

# API - Introduction

- [Introduction](https://docs.unizen.io/api-introduction/introduction.md): Empowering Web3 Builders with Unbeatable Token Swaps
- [Before you get started](https://docs.unizen.io/api-introduction/before-you-get-started.md): Good to know
- [Understanding Price Impact and Price Slippage in Token Swaps](https://docs.unizen.io/api-introduction/before-you-get-started/understanding-price-impact-and-price-slippage-in-token-swaps.md): This section clarifies the concepts of price impact and price slippage within the context of token swaps facilitated by the API.
- [Token Allowance Management for Non-updatable Allowance Tokens](https://docs.unizen.io/api-introduction/before-you-get-started/token-allowance-management-for-non-updatable-allowance-tokens.md)
- [Tokens with taxes](https://docs.unizen.io/api-introduction/before-you-get-started/tokens-with-taxes.md)
- [Wrapping and Unwrapping Native Tokens](https://docs.unizen.io/api-introduction/before-you-get-started/wrapping-and-unwrapping-native-tokens.md)
- [Quote expiration deadline](https://docs.unizen.io/api-introduction/before-you-get-started/quote-expiration-deadline.md)
- [Security Best Practices for Integrating Unizen](https://docs.unizen.io/api-introduction/security-best-practices-for-integrating-unizen.md): Ensuring that your Unizen integration is secure is essential for protecting both your application and your users. Below are best practices to follow when working with Unizen’s API.
- [Why disable CORS](https://docs.unizen.io/api-introduction/security-best-practices-for-integrating-unizen/why-disable-cors.md)
- [How to integrate with a reverse proxy](https://docs.unizen.io/api-introduction/security-best-practices-for-integrating-unizen/how-to-integrate-with-a-reverse-proxy.md)
- [Version 2 of our smart contracts](https://docs.unizen.io/api-introduction/version-2-of-our-smart-contracts.md): We are excited to introduce Version 2 of our smart contract, bringing significant enhancements to improve security, efficiency, and user experience.
- [Migration to smart contract v2](https://docs.unizen.io/api-introduction/version-2-of-our-smart-contracts/migration-to-smart-contract-v2.md): Upgrading your current Unizen API implementation to Version 2 is a simple process. Follow these steps to seamlessly transition to the new version and take advantage of its improved features.