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.
Documentation
Documentation
https://dev.epicgames.com/docs/epic-online-services
GettingStarted
https://dev.epicgames.com/docs/epic-online-services/eos-get-started
Other Resources
Portal
https://dev.epicgames.com
SDKs
https://dev.epicgames.com/docs/epic-online-services/platform-sdks
WebAPI
https://dev.epicgames.com/docs/web-api-ref
GraphQL
https://raw.githubusercontent.com/api-evangelist/epic-games/refs/heads/main/graphql/epic-games-graphql.md
APIsJSON
https://raw.githubusercontent.com/api-evangelist/epic-games/refs/heads/main/apis.yml