Photon Engine

Photon Engine (Exit Games) builds cross-platform multiplayer game networking backends - Photon Fusion, Photon Quantum, Photon Unity Networking (PUN), Photon Voice, Photon Chat, and the legacy Photon Bolt - all layered on the proprietary Photon Realtime transport protocol. Photon's core product is protocol-first and SDK-first, not REST-first - game clients exchange a custom binary message format (operation requests, operation responses, and events) with Name Server, Master Server, and Game Server roles, over UDP or TCP by default and, importantly, over WebSocket (ws:// unsecured, wss:// secured on port 443) as a first-class documented transport for WebGL and browser-hosted clients. Photon's own hosted surface exposes no general-purpose callable REST API for gameplay; the only genuinely HTTP surfaces are outbound - Room Lifecycle WebHooks (Photon POSTs room/join/leave/event/property/close notifications to a developer-hosted URL) and the Custom Authentication webservice contract (Photon calls out to a developer-hosted HTTP(S) endpoint to validate client tokens before allowing a connection). Pricing and account management are handled through the Photon Cloud Dashboard web UI, not a documented public REST API.

Photon Engine publishes 9 APIs on the APIs.io network, including Photon Realtime Transport Protocol, Custom Authentication API, Room Lifecycle WebHooks API, and 6 more. Tagged areas include Gaming, Multiplayer, Real-Time, Netcode, and Game Networking.

The Photon Engine catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Photon Engine’s developer surface includes documentation and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

32.4/100 thin ▬ flat Agent 18/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemium

1 published contract

Gaming Multiplayer Real-TimeNetcodeGame NetworkingWebSocket Binary Protocol

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 32.4/100 · thin

Contract Quality 9.5 / 19

Developer Ergonomics 1.1 / 15

Access Clarity 5.4 / 15

Operational Transparency 3.0 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/photonengine: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Photon Realtime Transport Protocol

The core Photon protocol - NOT a REST or JSON API. Clients connect through a Name Server to a Master Server (matchmaking/lobby) and then a Game Server (room gameplay), exchangin...

Photon PUN (Photon Unity Networking) API

Photon Unity Networking 2, the original high-level Unity multiplayer SDK layered over the Photon Realtime transport protocol (same binary messages, same UDP/TCP/WebSocket transp...

Photon Fusion Networking API

Photon's current-generation, high-level networking framework for Unity, supporting Shared Mode, Client-Host, and dedicated Server Mode topologies with state-authoritative simula...

Photon Quantum Deterministic Simulation API

Photon's deterministic, ECS-based simulation framework that ships player inputs (not state) across all clients in lockstep, re-simulating identically on every machine. Transport...

Photon Voice API

Cross-platform low-latency voice chat built directly on top of Photon Realtime - it inherits Realtime's matchmaking, rooms, and interest groups and streams Opus-encoded audio fr...

Photon Chat API

A separately billed Photon Cloud service (its own AppId type) for text messaging, presence, and friend lists, dedicated Chat Servers speaking the same Photon Realtime-style bina...

Photon Bolt (Legacy, Deprecated)

Legacy UDP-based Unity netcode product from Exit Games. No longer actively developed and not recommended for new projects - superseded by Photon Fusion. Documented here for comp...

Photon Engine Custom Authentication API

Endpoint Photon's server calls to validate a connecting client's credentials. You implement this; Photon is the caller.

Photon Engine Room Lifecycle WebHooks API

Endpoints Photon's Game Server calls (HTTP POST) at points in a room's lifecycle. You implement these; Photon is the caller.

Scroll for all 9

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Photon WebHooks and Webservice Contract Custom Authentication API

OPEN COLLECTION

Photon WebHooks and Webservice Contract Custom Authentication Room Lifecycle WebHooks API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Photonengine Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Photonengine Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Photonengine Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Photon Realtime Transport Protocol over WebSocket

AsyncAPI 2.6 description of Photon's **WebSocket transport** for the Photon Realtime binary protocol. Photon Realtime (and everything built on it - PUN, Fusion, Quantum, Voice, ...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Photon Engine API Rules

6 rules · 1 errors 4 warnings 1 info

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Photonengine Domain Security

TLSv1.3 · DMARC

SECURITY

Photonengine Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Photonengine Agentic Access

8 operations · 7 acting · 1 human-in-the-loop

8 operations · 7 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: photonengine
url: https://raw.githubusercontent.com/api-evangelist/photonengine/refs/heads/main/apis.yml
name: Photon Engine
kind: company
description: Photon Engine (Exit Games) builds cross-platform multiplayer game networking backends - Photon Fusion, Photon
  Quantum, Photon Unity Networking (PUN), Photon Voice, Photon Chat, and the legacy Photon Bolt - all layered on the proprietary
  Photon Realtime transport protocol. Photon's core product is protocol-first and SDK-first, not REST-first - game clients
  exchange a custom binary message format (operation requests, operation responses, and events) with Name Server, Master Server,
  and Game Server roles, over UDP or TCP by default and, importantly, over WebSocket (ws:// unsecured, wss:// secured on port
  443) as a first-class documented transport for WebGL and browser-hosted clients. Photon's own hosted surface exposes no
  general-purpose callable REST API for gameplay; the only genuinely HTTP surfaces are outbound - Room Lifecycle WebHooks
  (Photon POSTs room/join/leave/event/property/close notifications to a developer-hosted URL) and the Custom Authentication
  webservice contract (Photon calls out to a developer-hosted HTTP(S) endpoint to validate client tokens before allowing a
  connection). Pricing and account management are handled through the Photon Cloud Dashboard web UI, not a documented public
  REST API.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/photonengine.png
tags:
- Gaming
- Multiplayer
- Real-Time
- Netcode
- Game Networking
- WebSocket
- Binary Protocol
tags_raw:
- Gaming
- Multiplayer
- Realtime
- Netcode
- Game Networking
- WebSocket
- Binary Protocol
created: '2026-07-03'
modified: '2026-07-03'
specificationVersion: '0.23'
apis:
- aid: photonengine:photonengine-realtime-transport-api
  name: Photon Realtime Transport Protocol
  tags:
  - Real-Time
  - Binary Protocol
  - UDP
  - TCP
  - WebSocket
  tags_raw:
  - Realtime
  - Binary Protocol
  - UDP
  - TCP
  - WebSocket
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/realtime/current/getting-started/realtime-intro
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/realtime/current/getting-started/realtime-intro
    type: Documentation
  - url: https://doc.photonengine.com/realtime/current/reference/binary-protocol
    type: APIReference
  - url: https://doc.photonengine.com/realtime/current/connection-and-authentication/secure-networks
    type: Documentation
  - url: asyncapi/photonengine-asyncapi.yml
    type: AsyncAPI
  description: The core Photon protocol - NOT a REST or JSON API. Clients connect through a Name Server to a Master Server
    (matchmaking/lobby) and then a Game Server (room gameplay), exchanging a proprietary binary message format (operation
    requests, operation responses, and events framed inside eNet-style commands) over UDP (reliable/unreliable), TCP, or WebSocket.
    WebSocket is a first-class documented transport - clients set ConnectionProtocol to WebSocket or WebSocketSecure and connect
    with ws:// on port 80 or wss:// on port 443 (9090/19090 for self-hosted/Cloud Master listeners) - used primarily for WebGL
    and browser-hosted game clients.
- aid: photonengine:photonengine-pun-api
  name: Photon PUN (Photon Unity Networking) API
  tags:
  - PUN
  - Unity
  - Legacy
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/pun/current/getting-started/pun-intro
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/pun/current/getting-started/pun-intro
    type: Documentation
  - url: https://doc-api.photonengine.com/en/pun/current/
    type: APIReference
  description: Photon Unity Networking 2, the original high-level Unity multiplayer SDK layered over the Photon Realtime transport
    protocol (same binary messages, same UDP/TCP/WebSocket transports). Still supported for existing projects; Photon recommends
    Fusion or Quantum for new projects.
- aid: photonengine:photonengine-fusion-api
  name: Photon Fusion Networking API
  tags:
  - Fusion
  - Netcode
  - State Authoritative
  - Unity
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/fusion/current/getting-started/fusion-intro
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/fusion/current/getting-started/fusion-intro
    type: Documentation
  - url: https://doc-api.photonengine.com/en/fusion/current/
    type: APIReference
  description: Photon's current-generation, high-level networking framework for Unity, supporting Shared Mode, Client-Host,
    and dedicated Server Mode topologies with state-authoritative simulation. Runs its own tick/prediction layer on top of
    the Photon Realtime transport protocol; not a REST API.
- aid: photonengine:photonengine-quantum-api
  name: Photon Quantum Deterministic Simulation API
  tags:
  - Quantum
  - ECS
  - Deterministic
  - Lockstep
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/quantum/current/manual/introduction
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/quantum/current/manual/introduction
    type: Documentation
  - url: https://doc.photonengine.com/quantum/current/manual/webhooks
    type: Documentation
  description: Photon's deterministic, ECS-based simulation framework that ships player inputs (not state) across all clients
    in lockstep, re-simulating identically on every machine. Transport is the shared Photon Realtime protocol (UDP/TCP/WebSocket);
    Quantum also supports the same Room Lifecycle WebHooks as Realtime/Fusion.
- aid: photonengine:photonengine-voice-api
  name: Photon Voice API
  tags:
  - Voice
  - Audio
  - Opus
  - VoIP
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/voice/current/getting-started/voice-intro
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/voice/current/getting-started/voice-intro
    type: Documentation
  - url: https://doc-api.photonengine.com/en/voice/current/
    type: APIReference
  description: Cross-platform low-latency voice chat built directly on top of Photon Realtime - it inherits Realtime's matchmaking,
    rooms, and interest groups and streams Opus-encoded audio frames as Realtime events; no independent transport or REST
    surface of its own.
- aid: photonengine:photonengine-chat-api
  name: Photon Chat API
  tags:
  - Chat
  - Messaging
  - Presence
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/chat/current/getting-started/chat-intro
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/chat/current/getting-started/chat-intro
    type: Documentation
  - url: https://doc-api.photonengine.com/en/chat/current/
    type: APIReference
  description: A separately billed Photon Cloud service (its own AppId type) for text messaging, presence, and friend lists,
    dedicated Chat Servers speaking the same Photon Realtime-style binary protocol over UDP/TCP/WebSocket - not a REST or
    JSON chat API.
- aid: photonengine:photonengine-bolt-api
  name: Photon Bolt (Legacy, Deprecated)
  tags:
  - Bolt
  - Legacy
  - Deprecated
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://doc.photonengine.com/bolt/current/getting-started/bolt-intro
  baseURL: wss://ns.exitgames.com:443
  properties:
  - url: https://doc.photonengine.com/bolt/current/getting-started/bolt-intro
    type: Documentation
  description: Legacy UDP-based Unity netcode product from Exit Games. No longer actively developed and not recommended for
    new projects - superseded by Photon Fusion. Documented here for completeness since it remains listed among Photon's historical
    SDKs (PUN, Fusion, Quantum, Voice, Chat, Bolt).
- aid: photonengine:photonengine-custom-authentication-api
  name: Photon Engine Custom Authentication API
  description: Endpoint Photon's server calls to validate a connecting client's credentials. You implement this; Photon is
    the caller.
  humanURL: https://doc.photonengine.com/realtime/current/getting-started/realtime-intro
  baseURL: wss://ns.exitgames.com:443
  tags:
  - Custom Authentication
  properties:
  - type: OpenAPI
    url: openapi/photonengine-custom-authentication-api-openapi.yml
  - type: Documentation
    url: https://doc.photonengine.com/realtime/current/gameplay/web-extensions/webhooks
  - type: Documentation
    url: https://doc.photonengine.com/server/current/applications/loadbalancing/webhooks
  - type: Documentation
    url: https://doc.photonengine.com/realtime/current/connection-and-authentication/authentication/custom-authentication
- aid: photonengine:photonengine-room-lifecycle-webhooks-api
  name: Photon Engine Room Lifecycle WebHooks API
  description: Endpoints Photon's Game Server calls (HTTP POST) at points in a room's lifecycle. You implement these; Photon
    is the caller.
  humanURL: https://doc.photonengine.com/realtime/current/getting-started/realtime-intro
  baseURL: wss://ns.exitgames.com:443
  tags:
  - Room Lifecycle WebHooks
  properties:
  - type: OpenAPI
    url: openapi/photonengine-room-lifecycle-webhooks-api-openapi.yml
  - type: Documentation
    url: https://doc.photonengine.com/realtime/current/gameplay/web-extensions/webhooks
  - type: Documentation
    url: https://doc.photonengine.com/server/current/applications/loadbalancing/webhooks
  - type: Documentation
    url: https://doc.photonengine.com/realtime/current/connection-and-authentication/authentication/custom-authentication
common:
- type: AgenticAccess
  url: agentic-access/photonengine-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/photonengine-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/photonengine-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/exitgames
- type: LinkedIn
  url: https://www.linkedin.com/company/photon-engine
- type: Website
  url: https://www.photonengine.com
- type: Documentation
  url: https://doc.photonengine.com
- type: Plans
  url: plans/photonengine-plans-pricing.yml
- type: RateLimits
  url: rate-limits/photonengine-rate-limits.yml
- type: FinOps
  url: finops/photonengine-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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