# Weekly Sharkfin ## What is Antimatter Sharkfin? A principal-protected product, where users subscribe using the required currency and earn varying yields based on a specified price range of the underlying asset. The product runs on a weekly basis and redemption is only possible at maturity. Namely, sharkfin product has two parameters that change every week: Price range and APR range. They are adjusted to provide an attractive APR, but also low risk. In simpler words: you deposit a currency and earn yield on it, if the asset stays in a price range you get more %APR. If it doesn’t, you get less %APR. ## Product Positioning Sharkfin options are already an established structured product on various underlying assets. Antimatter is determined to bring traditional derivatives on-chain, while simultaneously innovating the space. Antimatter Sharkfin is the decentralized version of the traditional sharkfin product and will be starting out with $BTC and $ETH as first underlying assets. Users are provided with attractive APR rates, while keeping a low risk profile and keeping their principal protected. --- # 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.antimatter.finance/antimatter-structured-product/weekly-sharkfin.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.