# FAQ ## Q. What is the gas fee? Gas fees are fees paid to miners on blockchain. We do not receive any of these fees. We also don't control gas prices nor does it profit from them. ## Q. Who pays the gas fee? Almost all markets make the seller pay gas fees, but for our marketplace, we pay for you. We feel the price of gas fees limits the number of sellers entering the crypto market. \ \*We might change this later on, so be hurry selling NFTs : ) ## Q. What is the service fee? We receive 10% of transactions happening on primary sales, and we take 5% of transactions on secondary sales. ## Q. Can you also buy in Opensea? Yes, NFTs sold on MetaMart are also purchasable on Opensea and other marketplaces. ## Q. How to create your own contract? We do not support your own contract on MetaMart at this moment. ## Q. Which chain is supported? We only support Polygon right now. --- # 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://zoa.gitbook.io/zoa/marketplace/faq.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.