# Directly with smart contracts As of now, we only support integrating directly with smart contracts on these chains: * ETH * MATIC * AVAX * BNB 🚨 Note! This is likely the most difficult and most involved type of integration. We highly recommend using another option. This is because we have to figure out how to build the transaction to send directly to your smart contract Please email `marketplaces@usewinter.com` for more specific guidance Generally, we'll require a few things to do this type of integration: * Smart contract buy/sell functions (e.g. `atomicMatch` on Seaport) * A way to build the parameters to pass into the buy/sell function --- # 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.usewinter.com/marketplace-integrations/implementation-strategy/directly-with-smart-contracts.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.