# InventoryDistanceBasedSourceSelectionApi moduleThe `InventoryDistanceBasedSourceSelectionApi` module provides service contracts for distance based source selection algorithm. This module is part of the new inventory infrastructure. The[Inventory Management overview](https://devdocs.magento.com/guides/v2.3/inventory/index.html)describes the MSI (Multi-Source Inventory) project in more detail.## Installation detailsThis module is installed as part of Magento Open Source.## ExtensibilityThe `InventoryDistanceBasedSourceSelectionApi` module contains extension points and APIs that 3rd-party developerscan use to provide custom distance based source selection algorithms.### Public APIsPublic APIs are defined in the `Api` and `Api/Data` directories.### REST endpointsThe `etc/webapi.xml` file defines endpoints for managing distance based algorithms.