Token Standards: Understanding Erc-20, Erc-721, And Beyond

Token Standards: Understanding Erc-20, Erc-721, And Beyond
TIPOS de TOKENS en ETHEREUM 💡 Estándares ERC20, ERC223, ERC721, ERC from

Token Standards: Understanding ERC-20, ERC-721, and Beyond


With the rise of blockchain technology, the concept of tokenization has become increasingly popular. Tokens are digital assets that can represent ownership, access rights, or even unique digital items. In the Ethereum ecosystem, token standards like ERC-20 and ERC-721 have gained significant traction. In this article, we will explore these token standards and delve into their functionalities and use cases.

ERC-20 Standard

ERC-20 is a widely-used token standard on the Ethereum blockchain. It defines a set of rules and guidelines that a token contract must follow to be considered ERC-20 compliant. ERC-20 tokens are fungible, meaning each token is interchangeable with another token of the same type. They can represent anything from digital currencies to utility tokens for decentralized applications (dApps).

The ERC-20 standard specifies six mandatory functions that a token contract must implement: totalSupply, balanceOf, transfer, transferFrom, approve, and allowance. These functions enable token holders to check their balance, transfer tokens to other addresses, and approve other addresses to spend tokens on their behalf. ERC-20 tokens have become the foundation for countless Initial Coin Offerings (ICOs) and have played a pivotal role in the growth of the decentralized finance (DeFi) ecosystem.

ERC-721 Standard

Unlike ERC-20 tokens, ERC-721 tokens are non-fungible, meaning each token is unique and cannot be exchanged on a one-to-one basis. ERC-721 is the standard for creating and managing non-fungible tokens (NFTs) on the Ethereum blockchain. NFTs have gained immense popularity in the art and gaming industries, as they allow for the ownership and trading of unique digital assets.

The ERC-721 standard introduces additional functions compared to ERC-20, such as ownerOf, safeTransferFrom, and supportsInterface. These functions enable token owners to transfer ownership, check the current owner of a token, and verify if a contract supports the ERC-721 interface. NFTs have revolutionized the concept of digital ownership, allowing artists, game developers, and collectors to monetize their creations in a decentralized and transparent manner.

ERC-1155 Standard

While ERC-20 and ERC-721 have dominated the token landscape, the ERC-1155 standard offers a hybrid approach. It allows for the creation of both fungible and non-fungible tokens within a single contract. This flexibility makes ERC-1155 ideal for applications where a combination of both token types is required.

With ERC-1155, developers can create a single contract to manage multiple token types, reducing the complexity and gas costs associated with deploying multiple contracts. This standard also supports batch transfers, enabling efficient multi-token transfers in a single transaction. The versatility of ERC-1155 has made it a popular choice in gaming, where different types of tokens, such as in-game currencies and unique items, coexist within the same ecosystem.

Use Cases and Future Developments

The ERC-20, ERC-721, and ERC-1155 standards have paved the way for various use cases in the blockchain industry. ERC-20 tokens have enabled the creation of decentralized exchanges, lending platforms, and stablecoins. ERC-721 tokens have revolutionized digital art, gaming, and collectibles, creating new opportunities for creators and collectors alike. ERC-1155 tokens have found their niche in gaming ecosystems, facilitating the seamless integration of different token types.

Looking ahead, the Ethereum community continues to explore new token standards and improvements. EIP-2981 introduces royalties for NFTs, allowing creators to earn royalties on secondary market sales. EIP-721 provides a standardized way to query NFT metadata, making it easier for applications to display information about NFTs. These developments highlight the dynamic nature of the token landscape and the constant drive for innovation.


The Ethereum ecosystem has witnessed the emergence of several token standards, each serving a unique purpose. ERC-20 tokens have become the backbone of the DeFi ecosystem, ERC-721 tokens have revolutionized digital ownership, and ERC-1155 tokens offer a versatile approach for managing both fungible and non-fungible assets. As the blockchain industry continues to evolve, it is crucial to stay informed about these token standards and their implications. Understanding ERC-20, ERC-721, and beyond is essential for anyone looking to navigate the exciting world of blockchain-based tokens.

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