# Twin win strategy The vault earns a base APY and uses the remaining funding to purchase weekly [at-the-money](https://www.investopedia.com/terms/a/atthemoney.asp#:~:text=At%20the%20money%20\(ATM\)%20are,implied%20volatility%20or%20interest%20rates.) [knock-out barrier options](https://www.investopedia.com/terms/k/knock-outoption.asp#:~:text=Knock%2Dout%20options%20are%20a,losses%2C%20but%20also%20potential%20profits.).

Adjusting to a 10-delta barrier strike for both the lower and upper barriers makes the barriers move with volatility. This means that: 1. If the market anticipates low volatility, we don’t have to pay extra for wider barriers that will not be useful (as the probability of hitting them is very low so price goes up) 2. Barriers level will move with how spot has been moving historically 3. Keeps participation rate more stable from week to week as option price doesn’t vary as much --- # 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.ribbon.finance/ribbon-earn/ribbon-earn-usdc/twin-win-strategy.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.