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 Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

Open Source Social Network Real-Time Social

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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<a href="https://apis.io/providers/mastodon/"><img src="https://apis.io/badge/mastodon/card.svg" alt="Mastodon on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Contract Quality scores 39.2 — up to +15.2 composite points
Developer Ergonomics scores 40.5 — up to +11.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/mastodon/apis.yml: open an issue on github.com/api-evangelist/mastodon to ask a question or point us at an artifact you publish. 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	5.0 (thin)	-	1
Obsidian Community Plugins (third-party APIs the Obsidian plugin ecosystem integrates)	long-tail	5.0 (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.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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

Mastodon API pricing

Not yet checked against Mastodon's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Mastodon's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Mastodon

SLA

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: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  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

Mastodon API — frequently asked questions

Does Mastodon have an API?

Yes. APIs.io lists 1 API from Mastodon, including Mastodon API.

Is there an OpenAPI specification for the Mastodon API?

Yes. APIs.io indexes 1 OpenAPI specification for Mastodon, each linked for download from this page.

How do I authenticate with the Mastodon API?

Mastodon uses bearer-token authentication.

How much does the Mastodon API cost?

APIs.io lists 3 pricing plans for Mastodon, with each plan's price, limits and inclusions under Pricing on this page.

Is the Mastodon API ready for AI agents?

Mastodon has a Kin Score of 26.5 out of 100 (thin) and an Agent Readiness score of 22.5 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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MCP server

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Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/mastodon"

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Every operation they expose

curl "https://apis.io/api/v1/providers/mastodon/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/mastodon/evidence"

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