# Unreal Online Subsystem (OSS / OSSv2)

**Canonical:** https://apis.io/apis/unreal-engine/online-subsystem/  
**Provider:** Unreal Engine — https://apis.io/providers/unreal-engine/  
**Base URL:** https://dev.epicgames.com/documentation/en-us/unreal-engine  
**Documentation:** https://dev.epicgames.com/documentation/en-us/unreal-engine/online-subsystem-in-unreal-engine

Unreal Online Subsystem (OSS / OSSv2) is one of 6 APIs that [Unreal Engine](https://apis.io/providers/unreal-engine/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Achievements, Cross-Platform, Identity, Online Services, and Sessions. The published artifact set on APIs.io includes API documentation.

The Online Subsystem is Unreal's abstraction over platform online backends (Steam, PlayStation, Xbox Live, Nintendo, EOS, Google Play, Apple GameCenter, Discord). It exposes a consistent C++ interface for identity, sessions, friends, presence, achievements, leaderboards, voice, store, and entitlements that maps onto platform-specific or EOS-backed implementations.

## Machine-readable artifacts (1)

- **Documentation** — https://dev.epicgames.com/documentation/en-us/unreal-engine/online-subsystem-in-unreal-engine

## Other Unreal Engine APIs (5)

- [Unreal Engine C++ API](https://apis.io/apis/unreal-engine/unreal-engine-cpp-api/)
- [Unreal Blueprint Visual Scripting](https://apis.io/apis/unreal-engine/blueprint-visual-scripting/)
- [Unreal Pixel Streaming](https://apis.io/apis/unreal-engine/pixel-streaming/)
- [Unreal Render Hardware Interface (RHI)](https://apis.io/apis/unreal-engine/render-hardware-interface/)
- [Unreal Plugins and Fab Marketplace](https://apis.io/apis/unreal-engine/unreal-plugins-and-fab/)

## Tags

Achievements, Cross-Platform, Identity, Online Services, Sessions

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/unreal-engine/online-subsystem/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/unreal-engine/.