# Integrating with Marketplaces TL Creator Contracts can integrate seamlessly with any marketplaces that support ERC-721 or ERC-1155 standards. ## Open Marketplaces Open marketplaces, like OpenSea, Rarible, LooksRare, Blur, etc should work out of the box. These marketplaces simply look at a user's wallet for any NFTs and can index those easily. ## Closed Marketplaces Closed marketplaces are those marketplaces that index contracts after they have been validated. This includes marketplaces like SuperRare and Foundation. We are willing to help any of these marketplaces index over our contracts in an automated fashion as well. ### Verification Please view the source code on our GitHub and see the deployed implementation contract addresses in these docs as well. {% content-ref url="/pages/6DFhn5gjYFb6zyfFi8aI" %} [Implementation Contracts](/tl-creator-contracts/implementation-contracts.md) {% endcontent-ref %} ### Automation #### Contract Introspection Since all TL contracts implement ERC-1967 or ERC-1167, it is possible to look up what implementation contract is utilized by getting the value at the following storage slot (ERC-1967) or looking at the bytecode (ERC-1167) ```solidity 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc ``` From this, it can be verified that the NFT uses an approved implementation contract. Ideally this determines that the NFT should be indexed. --- # 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.transientlabs.xyz/integrations/integrating-with-marketplaces.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.