There have been numerous NFT collections launching as hybrid ERC721 / ERC20 (NFTs that can trade also as ERC20’s), they are launching under the pseudonym ERC-404, however, I cannot find that spec (which is kinda funny “404”). Curious if there are any existing specs which cover these hybrid tokens?
I found them super interesting, it provides liquidity outside of traditional NFT marketplaces and I could see these collections taking off.
REF: What Is ERC-404? The Experimental Standard Whose First Token Has Rocketed 12,000% in One Week