Matrix

Matrix is an open standard and decentralized protocol for real-time communication, providing federated messaging, voice, video, and IoT signalling across independently operated homeservers. The Matrix specification defines several REST APIs (Client-Server, Server-Server, Application Service, Identity Service, and Push Gateway) that interoperate across the federation. Authentication is typically performed via Bearer access tokens, with newer flows using OAuth 2.0.

Matrix publishes 15 APIs on the APIs.io network, including Account API, Capabilities API, CreateRoom API, and 12 more. Tagged areas include Messaging, Decentralized, Federated, Open Standard, and Real-Time Communication.

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

Matrix’s developer surface includes authentication, documentation, signup flow, support, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

29.8/100 thin ▬ flat Agent 18/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Messaging Decentralized Federated Open Standard Real-Time Communication VoIP

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 29.8/100 · thin

Contract Quality 12.2 / 23

Developer Ergonomics 5.1 / 18

Access Clarity 2.4 / 18

Operational Transparency 0.3 / 12

Contract Governance 1.2 / 11

Discoverability 6.2 / 9

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 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

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.

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/matrix: 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 20

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

Matrix Client-Server API

REST API used by Matrix clients to communicate with a homeserver, covering login, room creation and management, message sending, sync, device management, end-to-end encryption, ...

Matrix Server-Server (Federation) API

Federation API that lets Matrix homeservers exchange events, presence, and key information with one another over signed JSON requests.

Matrix Application Service API

API used by application services (bridges, bots) to integrate with a homeserver, claim namespaces, and exchange events.

Matrix Identity Service API

API for looking up Matrix user IDs from third-party identifiers such as email addresses and phone numbers via federated identity servers.

Matrix Push Gateway API

Push Gateway API homeservers use to deliver notifications to mobile push services on behalf of Matrix clients.

Matrix Account API

The Account API from Matrix — 1 operation(s) for account.

Matrix Capabilities API

The Capabilities API from Matrix — 1 operation(s) for capabilities.

Matrix CreateRoom API

The CreateRoom API from Matrix — 1 operation(s) for createroom.

Matrix Devices API

The Devices API from Matrix — 1 operation(s) for devices.

Matrix Directory API

The Directory API from Matrix — 1 operation(s) for directory.

Matrix Join API

The Join API from Matrix — 1 operation(s) for join.

Matrix Keys API

The Keys API from Matrix — 1 operation(s) for keys.

Matrix Login API

The Login API from Matrix — 1 operation(s) for login.

Matrix Logout API

The Logout API from Matrix — 1 operation(s) for logout.

Matrix Profile API

The Profile API from Matrix — 2 operation(s) for profile.

Matrix PublicRooms API

The PublicRooms API from Matrix — 1 operation(s) for publicrooms.

Matrix Refresh API

The Refresh API from Matrix — 1 operation(s) for refresh.

Matrix Register API

The Register API from Matrix — 1 operation(s) for register.

Matrix Rooms API

The Rooms API from Matrix — 4 operation(s) for rooms.

Matrix Sync API

The Sync API from Matrix — 1 operation(s) for sync.

Scroll for all 20

Open Collections 17

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

API Collection

OPEN COLLECTION

Matrix Client-Server Account API

OPEN COLLECTION

Matrix Client-Server Account Capabilities API

OPEN COLLECTION

Matrix Client-Server Account CreateRoom API

OPEN COLLECTION

Matrix Client-Server Account Devices API

OPEN COLLECTION

Matrix Client-Server Account Directory API

OPEN COLLECTION

Matrix Client-Server Account Join API

OPEN COLLECTION

Matrix Client-Server Account Keys API

OPEN COLLECTION

Matrix Client-Server Account Login API

OPEN COLLECTION

Matrix Client-Server Account Logout API

OPEN COLLECTION

Matrix Client-Server Account Profile API

OPEN COLLECTION

Matrix Client-Server Account PublicRooms API

OPEN COLLECTION

Matrix Client-Server Account Refresh API

OPEN COLLECTION

Matrix Client-Server Account Register API

OPEN COLLECTION

Matrix Client-Server Account Rooms API

OPEN COLLECTION

Matrix Client-Server Account Sync API

OPEN COLLECTION

Matrix Client-Server API

OPEN COLLECTION

Scroll for all 17

Event Specifications 1

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

Matrix Client-Server Sync API

AsyncAPI description of the Matrix Client-Server sync mechanism. Matrix delivers real-time events to clients through the `/_matrix/client/v3/sync` endpoint, which is a long-live...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Matrix API Rules

5 rules · 1 errors 4 warnings

SPECTRAL

Security Posture 3

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

Matrix Authentication

http · 1 scheme

SECURITY

Matrix Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Matrix Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Matrix Agentic Access

20 operations · 11 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

Specification Repository

Specification Repository

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 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: matrix
name: Matrix
description: Matrix is an open standard and decentralized protocol for real-time communication, providing federated messaging,
  voice, video, and IoT signalling across independently operated homeservers. The Matrix specification defines several REST
  APIs (Client-Server, Server-Server, Application Service, Identity Service, and Push Gateway) that interoperate across the
  federation. Authentication is typically performed via Bearer access tokens, with newer flows using OAuth 2.0.
type: Index
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/matrix.png
tags:
- Messaging
- Decentralized
- Federated
- Open Standard
- Real-Time Communication
- VoIP
url: https://raw.githubusercontent.com/api-evangelist/matrix/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.23'
apis:
- aid: matrix:client-server-api
  name: Matrix Client-Server API
  description: REST API used by Matrix clients to communicate with a homeserver, covering login, room creation and management,
    message sending, sync, device management, end-to-end encryption, and push notifications. Authentication uses Bearer access
    tokens issued by the homeserver, with OAuth 2.0 supported in newer versions.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Client-Server
  - Messaging
  - Rooms
  - Sync
  - Encryption
  properties:
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: OpenAPI Source
    url: https://github.com/matrix-org/matrix-spec/tree/main/data/api/client-server
- aid: matrix:server-server-api
  name: Matrix Server-Server (Federation) API
  description: Federation API that lets Matrix homeservers exchange events, presence, and key information with one another
    over signed JSON requests.
  humanURL: https://spec.matrix.org/latest/server-server-api/
  baseURL: https://matrix.org/_matrix/federation
  tags:
  - Federation
  - Server-Server
  - Decentralized
  properties:
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: OpenAPI Source
    url: https://github.com/matrix-org/matrix-spec/tree/main/data/api/server-server
- aid: matrix:application-service-api
  name: Matrix Application Service API
  description: API used by application services (bridges, bots) to integrate with a homeserver, claim namespaces, and exchange
    events.
  humanURL: https://spec.matrix.org/latest/application-service-api/
  baseURL: https://matrix.org/_matrix/app
  tags:
  - Bridges
  - Bots
  - Integration
  tags_raw:
  - Bridges
  - Bots
  - Integrations
  properties:
  - type: Documentation
    url: https://spec.matrix.org/latest/application-service-api/
  - type: OpenAPI Source
    url: https://github.com/matrix-org/matrix-spec/tree/main/data/api/application-service
- aid: matrix:identity-service-api
  name: Matrix Identity Service API
  description: API for looking up Matrix user IDs from third-party identifiers such as email addresses and phone numbers via
    federated identity servers.
  humanURL: https://spec.matrix.org/latest/identity-service-api/
  baseURL: https://matrix.org/_matrix/identity
  tags:
  - Identity
  - Lookup
  - 3PID
  properties:
  - type: Documentation
    url: https://spec.matrix.org/latest/identity-service-api/
  - type: OpenAPI Source
    url: https://github.com/matrix-org/matrix-spec/tree/main/data/api/identity
- aid: matrix:push-gateway-api
  name: Matrix Push Gateway API
  description: Push Gateway API homeservers use to deliver notifications to mobile push services on behalf of Matrix clients.
  humanURL: https://spec.matrix.org/latest/push-gateway-api/
  baseURL: https://matrix.org/_matrix/push
  tags:
  - Push Notifications
  - Mobile
  properties:
  - type: Documentation
    url: https://spec.matrix.org/latest/push-gateway-api/
  - type: OpenAPI Source
    url: https://github.com/matrix-org/matrix-spec/tree/main/data/api/push-gateway
- aid: matrix:matrix-account-api
  name: Matrix Account API
  description: The Account API from Matrix — 1 operation(s) for account.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/matrix-account-api-openapi.yml
- aid: matrix:matrix-capabilities-api
  name: Matrix Capabilities API
  description: The Capabilities API from Matrix — 1 operation(s) for capabilities.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Capabilities
  properties:
  - type: OpenAPI
    url: openapi/matrix-capabilities-api-openapi.yml
- aid: matrix:matrix-createroom-api
  name: Matrix CreateRoom API
  description: The CreateRoom API from Matrix — 1 operation(s) for createroom.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - CreateRoom
  properties:
  - type: OpenAPI
    url: openapi/matrix-createroom-api-openapi.yml
- aid: matrix:matrix-devices-api
  name: Matrix Devices API
  description: The Devices API from Matrix — 1 operation(s) for devices.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Devices
  properties:
  - type: OpenAPI
    url: openapi/matrix-devices-api-openapi.yml
- aid: matrix:matrix-directory-api
  name: Matrix Directory API
  description: The Directory API from Matrix — 1 operation(s) for directory.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Directory
  properties:
  - type: OpenAPI
    url: openapi/matrix-directory-api-openapi.yml
- aid: matrix:matrix-join-api
  name: Matrix Join API
  description: The Join API from Matrix — 1 operation(s) for join.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Join
  properties:
  - type: OpenAPI
    url: openapi/matrix-join-api-openapi.yml
- aid: matrix:matrix-keys-api
  name: Matrix Keys API
  description: The Keys API from Matrix — 1 operation(s) for keys.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/matrix-keys-api-openapi.yml
- aid: matrix:matrix-login-api
  name: Matrix Login API
  description: The Login API from Matrix — 1 operation(s) for login.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Login
  properties:
  - type: OpenAPI
    url: openapi/matrix-login-api-openapi.yml
- aid: matrix:matrix-logout-api
  name: Matrix Logout API
  description: The Logout API from Matrix — 1 operation(s) for logout.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Logout
  properties:
  - type: OpenAPI
    url: openapi/matrix-logout-api-openapi.yml
- aid: matrix:matrix-profile-api
  name: Matrix Profile API
  description: The Profile API from Matrix — 2 operation(s) for profile.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Profile
  properties:
  - type: OpenAPI
    url: openapi/matrix-profile-api-openapi.yml
- aid: matrix:matrix-publicrooms-api
  name: Matrix PublicRooms API
  description: The PublicRooms API from Matrix — 1 operation(s) for publicrooms.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - PublicRooms
  properties:
  - type: OpenAPI
    url: openapi/matrix-publicrooms-api-openapi.yml
- aid: matrix:matrix-refresh-api
  name: Matrix Refresh API
  description: The Refresh API from Matrix — 1 operation(s) for refresh.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Refresh
  properties:
  - type: OpenAPI
    url: openapi/matrix-refresh-api-openapi.yml
- aid: matrix:matrix-register-api
  name: Matrix Register API
  description: The Register API from Matrix — 1 operation(s) for register.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Register
  properties:
  - type: OpenAPI
    url: openapi/matrix-register-api-openapi.yml
- aid: matrix:matrix-rooms-api
  name: Matrix Rooms API
  description: The Rooms API from Matrix — 4 operation(s) for rooms.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Rooms
  properties:
  - type: OpenAPI
    url: openapi/matrix-rooms-api-openapi.yml
- aid: matrix:matrix-sync-api
  name: Matrix Sync API
  description: The Sync API from Matrix — 1 operation(s) for sync.
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.org/_matrix/client
  tags:
  - Sync
  properties:
  - type: OpenAPI
    url: openapi/matrix-sync-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/matrix-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/matrix-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/matrix-domain-security.yml
- type: Authentication
  url: authentication/matrix-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/matrix-org
- type: Website
  url: https://matrix.org
- type: Documentation
  url: https://spec.matrix.org/latest/
- type: Specification Repository
  url: https://github.com/matrix-org/matrix-spec
- type: GitHubOrganization
  url: https://github.com/matrix-org
- type: Signup
  url: https://matrix.org/try-matrix/
- type: Support
  url: https://matrix.org/support/
- url: https://matrix.org/blog/feed/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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