> For the complete documentation index, see [llms.txt](https://docs.fraktal.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fraktal.io/marketplace/get-started/selling-fraktions/auction.md). # Auction Fraktal NFT Auctions are a new selling format in the NFT ecosystem. Instead of the highest bidder receiving the NFT, everyone who contributes ETH receives a share of the NFT. For example: Alice lists 50% of her Bored Ape with a reserve price of 70 ETH. The auction is then live for 10 days. During that period users contribute ETH and at the end of 10 days if the reserve is not met, Alice receives her 50% of the Ape back and users can withdraw their ETH. If the reserve is met, i.e 100 ETH are contributed, then Alice receives 90 ETH and the 50% is split up between every contributor in the auction. Example: If Bob contributes 10 ETH to the auction, he receives 500 Fraktions (5% of the NFT) \[(10 ETH / 100 ETH) \* 5,000 Fraktions] Formula: (User ETH Contributed / Total ETH contributed) \* Fraktions for Sale ![](/files/2usb81YAW5Q9Hq2gwOkJ) --- # 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.fraktal.io/marketplace/get-started/selling-fraktions/auction.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.