> For the complete documentation index, see [llms.txt](https://dev.bondprotocol.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.bondprotocol.finance/smart-contracts/bond-system/auctioneer/sequential-dutch-auctioneer-sda/fixed-expiry-sda.md).

# Fixed-Expiry SDA

### Fixed-Expiry SDA Contract

The Fixed-Expiry SDA is an implementation of the [Base SDA](/smart-contracts/bond-system/auctioneer/sequential-dutch-auctioneer-sda.md) contract specific to creating fixed-expiry bond markets and deploying an ERC20 bond position token for the market on creation.