# Historical context ### Context Doppler was initially released with two SDKs — one for the v3 version of the protocol that facilitates static bonding curves, and another for the v4 version of the protocol, facilitating dynamic bonding curves with dutch auctions. This decision was inspired by Uniswap having different SDKs and versioning for different versions of the Uniswap protocol. Doppler has decided in an effort to optimize developer experience and ease of switching between different versions of the protocol to *consolidate the two SDKs* into a single package and interface. Additionally we have chosen to implement a friendly and intuitive builder pattern, making it even easier to configure auctions, governance, vesting, liquidity migration, and quotes/swapping. ## Status The original v3/v4 Doppler SDKs are officially deprecated and no longer supported. Teams using these SDKs are encouraged to migrate as soon as possible using this migration guide to the latest SDK. The legacy SDKs are hosted at . The new, officially supported SDK (previously referred to as the "alpha" SDK) is now hosted at [https://github.com/whetstoneresearch/doppler-sdk ](https://github.com/whetstoneresearch/doppler-sdk)and released in Beta. This is currently used in the Doppler Application and various third party applications, making it the official recommendation. --- # 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.doppler.lol/reference/legacy-sdks-and-migration-guides/overview.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.