Synapse

Synapse is the reference Matrix homeserver implementation maintained by Element (formerly by the Matrix.org Foundation). Written in Python and Rust, it implements the Matrix open standard for secure, decentralized real-time communication. Synapse powers thousands of deployments worldwide and provides Client-Server, Server-Server (federation), Application Service, Identity Service, and Admin APIs. Since version 1.99, maintained by Element under AGPL-3.0.

Synapse publishes 8 APIs on the APIs.io network, including Federation API, Media API, Registration API, and 5 more. Tagged areas include Chat, Collaboration, Decentralized, Federation, and Matrix.

The Synapse catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Synapse’s developer surface includes authentication, GitHub presence, documentation, getting-started guide, changelog, engineering blog, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

37.6/100 thin ▬ flat Agent 29/100 agent aware Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

AccessPaidSelf serve

9 APIs

Chat Collaboration Decentralized Federation Matrix Messaging Open-Source Real-Time

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 37.6/100 · thin

Contract Quality 15.0 / 25

Developer Ergonomics 7.1 / 20

Access Clarity 2.6 / 20

Operational Transparency 3.8 / 13

Contract Governance 1.6 / 12

Discoverability 7.4 / 10

Agent readiness — 29/100 · 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 7 / 7

Typed Event Surface 0 / 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/synapse: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 9

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

Open Collections 10

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

Rate Limits 1

Documented rate limits and quota policies.

Synapse Rate Limits

11 limits

RATE LIMITS

FinOps 1

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

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Examples 1

Example request and response payloads for these APIs.

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

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 2

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

GitHub

GitHub

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

ChangeLog

ChangeLog

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

LinkedIn

Blog

Blog

Other 3

Properties that don't map to a standard resource type

Docker

Docker

PyPI

PyPI

Matrix Spec

Matrix Spec

Source (apis.yml)

aid: synapse
name: Synapse
description: Synapse is the reference Matrix homeserver implementation maintained by Element (formerly by the Matrix.org Foundation).
  Written in Python and Rust, it implements the Matrix open standard for secure, decentralized real-time communication. Synapse
  powers thousands of deployments worldwide and provides Client-Server, Server-Server (federation), Application Service, Identity
  Service, and Admin APIs. Since version 1.99, maintained by Element under AGPL-3.0.
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-11'
  method: derived
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://matrix.org/images/matrix-logo.svg
url: https://raw.githubusercontent.com/api-evangelist/synapse/refs/heads/main/apis.yml
created: '2026-05-03'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: synapse:synapse-application-service-api
  name: Synapse Application Service API
  description: API for integrating application services (bridges and bots) with the Matrix homeserver. Allows third-party
    applications to handle namespaced user IDs and room aliases, enabling Matrix bridges for IRC, Slack, Telegram, and other
    platforms.
  image: https://matrix.org/images/matrix-logo.svg
  humanURL: https://spec.matrix.org/latest/application-service-api/
  baseURL: https://matrix.example.com/_matrix/app
  tags:
  - Application Services
  - Bots
  - Bridges
  - Integration
  - Matrix
  tags_raw:
  - Application-Services
  - Bots
  - Bridges
  - Integration
  - Matrix
  properties:
  - type: Documentation
    url: https://spec.matrix.org/latest/application-service-api/
- aid: synapse:synapse-federation-api
  name: Synapse Federation API
  description: Federation management
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Federation
  properties:
  - type: OpenAPI
    url: openapi/synapse-federation-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-media-api
  name: Synapse Media API
  description: Media file administration
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Media
  properties:
  - type: OpenAPI
    url: openapi/synapse-media-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-registration-api
  name: Synapse Registration API
  description: User registration and tokens
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Registration
  properties:
  - type: OpenAPI
    url: openapi/synapse-registration-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-reports-api
  name: Synapse Reports API
  description: Event and user reports
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Reports
  properties:
  - type: OpenAPI
    url: openapi/synapse-reports-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-rooms-api
  name: Synapse Rooms API
  description: Room administration and membership
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Rooms
  properties:
  - type: OpenAPI
    url: openapi/synapse-rooms-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-server-api
  name: Synapse Server API
  description: Server information and background updates
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Server
  properties:
  - type: OpenAPI
    url: openapi/synapse-server-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-statistics-api
  name: Synapse Statistics API
  description: Server usage statistics
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - Statistics
  properties:
  - type: OpenAPI
    url: openapi/synapse-statistics-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
- aid: synapse:synapse-users-api
  name: Synapse Users API
  description: User account management
  humanURL: https://spec.matrix.org/latest/client-server-api/
  baseURL: https://matrix.example.com/_matrix/client
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/synapse-users-api-openapi.yml
  - type: Documentation
    url: https://spec.matrix.org/latest/client-server-api/
  - type: Documentation
    url: https://spec.matrix.org/latest/server-server-api/
  - type: Documentation
    url: https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/
  - type: GitHub
    url: https://github.com/matrix-org/synapse/tree/develop/docs/admin_api
common:
- type: AgenticAccess
  url: agentic-access/synapse-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/synapse-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/synapse-domain-security.yml
- type: Authentication
  url: authentication/synapse-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/synapsepay
- type: GitHub
  url: https://github.com/matrix-org/synapse
- type: GitHub
  url: https://github.com/element-hq/synapse
- type: Documentation
  url: https://matrix-org.github.io/synapse/latest/
- type: GettingStarted
  url: https://matrix-org.github.io/synapse/latest/setup/installation.html
- type: Authentication
  url: https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#authentication
- type: RateLimits
  url: https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#ratelimiting
- type: ChangeLog
  url: https://github.com/matrix-org/synapse/blob/develop/CHANGES.md
- type: License
  url: https://github.com/matrix-org/synapse/blob/develop/LICENSE
- type: Docker
  url: https://hub.docker.com/r/matrixdotorg/synapse
- type: PyPI
  url: https://pypi.org/project/matrix-synapse/
- type: Matrix Spec
  url: https://spec.matrix.org/latest/
- url: https://www.matrix.org/blog/feed/
  type: Blog
maintainers:
- FN: API Evangelist
  email: info@apievangelist.com
tags:
- Chat
- Collaboration
- Decentralized
- Federation
- Matrix
- Messaging
- Open-Source
- Real-Time

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