Mastodon website screenshot

Mastodon

Mastodon is a open source, self-hosted, social networking service. Mastodon uses the ActivityPub protocol for federation which allows users to communicate between independent Mastodon instances and other ActivityPub compatible services. Mastodon has microblogging features similar to Twitter, and is generally considered to be a part of the Fediverse.

Mastodon publishes 1 API on the APIs.io network. Tagged areas include Open-Source and Social Networks.

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

Mastodon’s developer surface includes getting-started guide, authentication, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub
29.6/100 thin ▬ flat Agent 23/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFreemium
1 APIs
Open-SourceSocial Networks

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 29.6/100 · thin
Contract Quality 10.6 / 25
Developer Ergonomics 8.1 / 20
Access Clarity 3.2 / 20
Operational Transparency 1.4 / 13
Contract Governance 1.4 / 12
Discoverability 5.0 / 10
Agent readiness — 23/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 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
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
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/mastodon: 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 1

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

Mastodon API

This is an OpenAPI for the Mastodon API.

Open Collections 1

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

Mastodon API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Mastodon Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mastodon Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Mastodon Finops

FINOPS

Event Specifications 1

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

Mastodon Streaming and Web Push API

AsyncAPI 2.6 description of the Mastodon real-time surface. Mastodon exposes two complementary asynchronous interfaces: * Streaming API - delivers timeline and notification even...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Mastodon API Rules

9 rules · 1 errors 8 warnings

SPECTRAL

Security Posture 1

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

Mastodon Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 PostmanWorkspace
PostmanWorkspace

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication
 OauthScopes
OauthScopes

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Company 3

The organization behind the API

Website
Website
 LinkedIn
LinkedIn
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: mastodon
url: https://raw.githubusercontent.com/api-search/mastodon/refs/heads/main/apis.yml
apis:
- aid: mastodon:mastodon
  name: Mastodon API
  tags:
  - Social Networks
  humanURL: https://docs.joinmastodon.org/
  properties:
  - url: https://docs.joinmastodon.org/client/intro/
    type: Documentation
  - url: openapi/mastodon.yml
    type: OpenAPI
  - url: asyncapi/mastodon-streaming.yml
    type: AsyncAPI
  description: This is an OpenAPI for the Mastodon API.
name: Mastodon
tags:
- Open-Source
- Social Networks
type: Index
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: '2026-08-28'
  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/mastodon.png
access: 3rd-Party
created: '2024-11-16'
modified: '2026-05-30'
position: Consuming
description: Mastodon is a open source, self-hosted, social networking service. Mastodon uses the ActivityPub protocol for
  federation which allows users to communicate between independent Mastodon instances and other ActivityPub compatible services.
  Mastodon has microblogging features similar to Twitter, and is generally considered to be a part of the Fediverse.
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com
specificationVersion: '0.23'
common:
- type: Website
  url: https://www.joinmastodon.org/
- type: DomainSecurity
  url: security/mastodon-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/mastodon
- type: LinkedIn
  url: https://www.linkedin.com/company/joinmastodon
- name: Getting started with the API - Mastodon documentation
  url: https://docs.joinmastodon.org/client/intro/
  type: GettingStarted
- name: Rate limits - Mastodon documentation
  url: https://docs.joinmastodon.org/api/rate-limits/
  type: RateLimits
- name: OAuth Tokens - Mastodon documentation
  url: https://docs.joinmastodon.org/api/oauth-tokens/
  type: Authentication
- name: OAuth Scopes - Mastodon documentation
  description: OAuth Scopes
  url: https://docs.joinmastodon.org/api/oauth-scopes/
  type: OauthScopes
- name: Postman Workspace
  description: This is an API Evangelist workspace.
  url: https://www.postman.com/api-evangelist/mastodon/overview
  type: PostmanWorkspace
- name: Mastodon Blog
  url: https://blog.joinmastodon.org/index.xml
  type: Blog

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