> ## Documentation Index
> Fetch the complete documentation index at: https://docs.parallaxprotocol.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Token Standards

## Introduction

Many Parallax development standards focus on token interfaces. These standards help ensure smart contracts remain composable, so for instance when a new project issues a token, that it remains compatible with existing decentralized exchanges.

## Prerequisites

* [Smart contracts](/protocol/parallax-stack/smart-contracts)

## Token Standards

Here are some of the most popular token standards on Parallax:

* [ERC-20](/protocol/advanced/standards/erc-20) - A standard interface for fungible (interchangeable) tokens, like voting tokens, staking tokens or virtual currencies.
* [ERC-721](/protocol/advanced/standards/erc-721) - A standard interface for non-fungible tokens, like a deed for artwork or a song.

***

*Adapted from [Token Standards](https://ethereum.org/developers/docs/standards/tokens/) on ethereum.org, © ethereum.org contributors, under the MIT License. See the [third-party notices](https://github.com/ParallaxProtocol/parallax-docs/blob/main/THIRD_PARTY_NOTICES.md).*


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