> For the complete documentation index, see [llms.txt](https://docs.doppler.lol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides.md).

# Legacy SDK migration guide

- [v3](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3.md)
- [Overview](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/overview.md): Overview of Doppler V3
- [Get Started](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/getting-started.md): Getting Started with Doppler V3 SDK
- [Factory](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/factory.md): Factory Class Reference
- [Token](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/token.md): Token Class Reference
- [Quoter](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/quoter.md): Quoter Class Reference
- [Custom Fees](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/custom-fees.md): Arbitrary migration to Uniswap v4 pools with customizable fees
- [Governance Options](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/governance-options.md)
- [Streamable V3](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v3/streamable-v3.md): Streamable V3 (Lockable V3 Pools) Reference
- [v4](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4.md)
- [Overview](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/overview.md): Overview of the Doppler V4 SDK
- [Get Started](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/getting-started.md): Getting Started with Doppler V4 SDK
- [Examples](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/examples.md)
- [Factory](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/factory.md): Factory Class Reference
- [Quoter](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/quoter.md): Quoter Class Reference
- [Lens](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/lens.md): Quoter Class Reference
- [Custom Fees](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/custom-fees.md)
- [Governance Options](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/v4/governance-options.md)
- [Historical context](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/overview.md)
- [Legacy SDK migration guide](https://docs.doppler.lol/reference/legacy-sdks-and-migration-guides/sdk-migration-guide.md): Migrate from the (legacy) Doppler v3 or v4 SDK to the latest