# ERC1155 Compatibility Hats Protocol conforms fully to the ERC1155 interface. All external functions required by the [ERC1155 standard](https://eips.ethereum.org/EIPS/eip-1155) are exposed by Hats Protocol. This is how hats can work out of the box with existing token-gating applications. However, Hats Protocol is not fully compliant with the ERC1155 standard. Since hats are not transferable by their owners (aka "wearers"), there is little need for safe transfers and the `ERC1155TokenReceiver` logic. Developers building on top of Hats Protocol should note that mints and transfers of hats will not, for example, include calls to `onERC1155Received`. To avoid confusion, Hats Protocol does not claim to be ERC1155-*compliant*. Instead, we say that Hats Protocol has "ERC1155-*similar*" tokens. When referring specifically to the ERC1155 *interface*, however, we do say that Hats Protocol conforms fully. --- # 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.hatsprotocol.xyz/for-developers/hats-protocol-for-developers/erc1155-compatibility.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.