> For the complete documentation index, see [llms.txt](https://docs.sanko.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sanko.xyz/sanko-mainnet/sudoswap/sudoswap-overview/royalties.md). # Royalties Royalties are enforced on liquidity pools at the contract level. Royalties are automatically enabled for collections implementing the [ERC2981 royalty standard](https://eips.ethereum.org/EIPS/eip-2981). ## Royalty Engine The `RoyaltyEngine` contract is a fork of the [Royalty Engine](https://github.com/manifoldxyz/royalty-registry-solidity/blob/main/contracts/RoyaltyEngineV1.sol) created by Manifold as part of the Royalty Registry initiative. This contract determines the provisional value of royalties due for a swap of given `value` and the address that should receive them. If a collection implements ERC2981, the `RoyaltyEngine` retrieves royalty information from the collection contract itself. Royalty information returned from the engine is used in the `_calculateRoyalties` function on pair contracts, which is called internally by all swap methods, unless: * The royalty exceeds the sale price, in which case no royalty is applied. * A Setting is in place for the pool. When a Setting is in place for a given pair, the `_calculateRoyalties` function will overwrite the royalty *value* returned by the `RoyaltyEngine` using the `getFeeSplitBps` view on the Setting contract. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.sanko.xyz/sanko-mainnet/sudoswap/sudoswap-overview/royalties.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.