# Unreal Engine

**Canonical:** https://apis.io/providers/unreal-engine/  
**Website:** https://www.unrealengine.com  
**APIs profiled:** 6

Unreal Engine is Epic Games' real-time 3D engine for games, film, broadcast, architecture, simulation, automotive, and live events. The engine is shipped as a downloadable editor, source on GitHub (under the Unreal Engine EULA), and a deep C++ and Blueprint API surface rather than a public REST API. The developer-facing surface includes the Unreal C++ API reference, the Blueprint visual scripting API, the Online Subsystem (OSS) abstraction over platform backends, the Pixel Streaming framework for streaming Unreal apps over WebRTC, the Render Hardware Interface (RHI), the Slate UI framework, and a plugin and Marketplace ecosystem (now Fab). Programmatic backend integration for Unreal-built games is typically delivered via Epic Online Services (EOS), profiled separately. This profile documents Unreal Engine as an SDK and tooling surface rather than as a REST API.

## Kin Score — 22.7 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 22.7).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 42.1 |
| Developer Ergonomics | 16.7 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

## Agent readiness — 2.5 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (6)

- **Unreal Engine C++ API** — The Unreal Engine C++ API is the primary programmatic surface of the engine. It is shipped as engine source on GitHub (under the Unreal Engine EULA) and documented as a per-modu...
- **Unreal Blueprint Visual Scripting** — Blueprints are Unreal Engine's visual scripting system. Blueprint nodes wrap the underlying C++ API, letting designers and programmers build gameplay, UI, and tooling logic with...
- **Unreal Online Subsystem (OSS / OSSv2)** — 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 c...
- **Unreal Pixel Streaming** — Pixel Streaming streams an Unreal Engine application running on a server to remote browser clients over WebRTC. The framework includes a Pixel Streaming plugin in the engine, a ...
- **Unreal Render Hardware Interface (RHI)** — The Render Hardware Interface is Unreal's abstraction over graphics APIs (Direct3D 11/12, Vulkan, Metal, OpenGL ES). Engine and plugin developers write rendering code against th...
- **Unreal Plugins and Fab Marketplace** — Unreal Engine has a first-class plugin architecture and a content and code marketplace. The historical Unreal Engine Marketplace was consolidated into Fab, Epic's unified conten...

## Security (2)

- **Unreal Engine Domain Security** — TLSv1.3 · HSTS · DMARC
- **Unreal Engine Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Plans (1)

- **Unreal Engine Plans Pricing**

## Tags

3D, Blueprints, C++, Game Development, Game Engine, Pixel Streaming, Plugin, Real-Time, Rendering, RHI, SDK, Unreal Engine, WebRTC

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/unreal-engine/). Scores are computed from the provider's own public artifacts under a published rubric.