# ERC721-O ERC721-O is a standard interface and implementation for omnichain non-fungible tokens (NFT) based on ERC721. It aims to allow third-party applications (e.g., wallet/marketplace) to interact with any token implemented in this interface uniformly. It also enables the implementation of multiple new features and proposed solutions to mitigate security issues in the cross-chain domain. You can find our [full introduction](https://catddle.medium.com/erc721o-e6c9a0ae09e1) here. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.catddle.com/technology/erc721-o.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.