> For the complete documentation index, see [llms.txt](https://seacows.gitbook.io/seacows-amm-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://seacows.gitbook.io/seacows-amm-docs/technical-reference/core/seacowserc721tradepair/seacowscomplement.md).

# SeacowsComplement

Due to the different nature between ERC20 Token and ERC721 Non-Fungible Token (NFT), ERC20-ERC721 AMM has to deal with the problem of NFT fractionalisation.