What Is ERC-404?

ERC-404 is an experimental token standard on the Ethereum blockchain, introducing a unique hybrid concept that combines features of ERC-20 (fungible tokens) and ERC-721 (non-fungible tokens). It aims to create semi-fungible tokens, allowing for both fungibility and non-fungibility within a single token standard.

While ERC-20 tokens are entirely interchangeable, and ERC-721 tokens are individually unique, ERC-404 takes a middle ground. It introduces a novel approach to tokenization, leveraging elements from both ERC-20 and ERC-721 standards. This distinctive blend sets ERC-404 apart from the homogeneity of ERC-20 and the singular uniqueness of ERC-721 tokens, offering a dynamic token standard.

How ERC-404 Tokens Work

Semi-Fungible Nature

ERC-404 tokens are coined as "semi-fungible," embodying a unique combination of fungibility and non-fungibility. Unlike traditional tokens that are either entirely interchangeable (fungible) or individually unique (non-fungible), ERC-404 tokens can switch between these states. This distinctive feature adds a layer of versatility to digital assets, offering new possibilities in the world of tokenization.

Conceptualization and Creation

Developed by pseudonymous creators "ctrl" and "Acme," ERC-404 emerged as a response to liquidity challenges within the NFT market. The goal was to bridge the gap between fungible and non-fungible tokens, providing a new category of digital assets known as semi-fungible tokens.

Mint-and-Burn Mechanism

At its core, ERC-404 operates on a mint-and-burn mechanism, facilitating fractional ownership and transfer of non-fungible tokens (NFTs). This mechanism allows the division of NFTs into smaller, tradable pieces, democratizing access to valuable digital assets and enhancing liquidity in the market.

Optimizing Gas Efficiency

While ERC-404 is still in its experimental phase, ongoing efforts are focused on optimizing gas costs. Developers are working towards reducing transaction fees associated with the frequent minting and burning processes, enhancing the overall efficiency of the ERC-404 standard.


ERC-404 represents an interesting advancement in blockchain technology, introducing a versatile solution that merges the benefits of fungible and non-fungible tokens. While challenges and uncertainties surround its experimental nature, the active development and growing adoption of ERC-404 projects underscore its potential to impact the digital asset space. As it continues to evolve, ERC-404 stands as an innovative token standard for enhanced liquidity, fractional ownership, and asset management.