Smart Layer posted on social media that ST404 is a token that combines the liquidity of ERC20 and the uniqueness of ERC721. It will soon be used in ecosystem projects. ST404 solves the problem of low gas efficiency, provides potential for dynamic interaction, and includes a programmable token front-end. The core of ST404 uses deterministic mapping of NFTs. Each token in the pool is uniquely identifiable without explicit on-chain storage, greatly improving scalability.

ST404 is fully compatible with ERC20 and ERC721 interfaces, including a unified transfer mechanism that can handle pliable and solidified tokens elegantly, ensuring maximum user flexibility and DeFi compatibility.