Epic Online Services (EOS)
Epic Online Services is Epic's free cross-platform backend for games. EOS exposes both a native C/C++ SDK (with Unity, Unreal, and platform wrappers) and a set of REST web services covering identity (Epic Account Services, Connect, Auth), social (Friends, Presence, Blocklist), play (Lobby, Sessions, P2P, Voice), progression (Achievements, Stats, Leaderboards), storage (Player Data Storage, Title Storage), integrity (Anti-Cheat, Sanctions, Reports), and commerce (Ecom). All EOS APIs are gated behind an Epic developer organization, sandbox, and client credentials issued in the EOS Developer Portal.
Epic Online Services (EOS) is one of 5 APIs that Epic Games publishes on the APIs.io network.
Tagged areas include Achievements, Anti-Cheat, EOS, Game Backend, and Identity. The published artifact set on APIs.io includes API documentation, a getting-started guide, and SDKs.