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 is listed with 1 API on the APIs.io network. Tagged areas include Open Source, Social Network, Real-Time, and Social.

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 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

26.5/100 thin ▬ flat Agent 23/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0

AccessFreemium

1 API

Open Source Social Network Real-Time Social

Kin Score

Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0

Composite quality — 26.5/100 · thin

Contract Quality 8.3 / 21

Developer Ergonomics 6.9 / 17

Access Clarity 1.3 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.2 / 10

Discoverability 4.1 / 9

Regulatory Posture 1.8 / 15

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

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 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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Social and Fediverse	long-tail	2.5 (thin)	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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 — asyncapi 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

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Source (apis.yml)

aid: mastodon
url: https://raw.githubusercontent.com/api-search/mastodon/refs/heads/main/apis.yml
apis:
- aid: mastodon:mastodon
  name: Mastodon API
  tags:
  - Social Network
  tags_raw:
  - 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 Network
- Real-Time
- Social
tags_raw:
- Open-Source
- Social Networks
- Real-Time
- Social
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: Plans
  url: plans/mastodon-plans-pricing.yml
- type: FinOps
  url: finops/mastodon-finops.yml
- 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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