# wstrBTC ERC-4626 Wrapper **`wstrBTC` is an ERC-4626-compliant wrapper** for `strBTC`, designed to ensure compatibility with DeFi protocols that require non-rebasing, fixed-balance tokens. While `strBTC` leverages a rebasing mechanism to reflect yield directly in user balances, many DeFi platforms are not optimized to support rebasing assets. `wstrBTC` solves this by wrapping `strBTC` into a standard vault interface, allowing users to deposit `strBTC` and receive a fixed-amount `wstrBTC` token in return. This enables seamless participation in DeFi applications such as lending markets, yield aggregators, and collateralized protocols. Internally, `wstrBTC` accrues yield through changes in its exchange rate relative to `strBTC`, preserving the underlying yield dynamics while maximizing composability and protocol compatibility. --- # 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.stroom.network/stroom/smart-contracts/wstrbtc-erc-4626-wrapper.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.