Lemmy

Lemmy is a free, open-source, self-hostable federated link aggregator and discussion platform built as a Reddit alternative. It exposes a versioned REST API at /api/v4/ for creating posts, commenting, managing communities, voting, searching, and administering instances. Lemmy federates across the Fediverse using the ActivityPub protocol, allowing users on different Lemmy instances and compatible platforms (Mastodon, PeerTube, Friendica) to interact without a central server. Each instance operator configures their own rate limits; default limits include 50 comments per 10 minutes, 100 searches per 10 minutes, and 5 new registrations per day. Authentication uses JWT bearer tokens obtained via the login endpoint. The software is licensed under AGPL-3.0 and written in Rust with an Actix web framework backend.

Lemmy publishes 14 API contracts indexed on the APIs.io network, including Account API, Admin API, Authentication API, and 11 more. Tagged areas include Community, Federated, Fediverse, Link Aggregator, and Open Source.

The Lemmy catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Lemmy’s developer surface includes authentication, documentation, getting-started guide, engineering blog, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.3/100 thin ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 72/100 alive open core · AGPL-3.0 Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Community Federated FediverseLink AggregatorOpen Source Social Network

Kin Score

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

Composite quality — 34.3/100 · thin

Contract Quality 11.5 / 16

Developer Ergonomics 1.5 / 13

Access Clarity 1.0 / 13

Operational Transparency 3.1 / 8

Contract Governance 1.8 / 8

Discoverability 4.3 / 7

Regulatory Posture 2.5 / 15

Open Source Surface 2.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · 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 7 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 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.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

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.

The six quality facets above are damped to 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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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
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
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

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
Developer Ergonomics scores 11.9 — up to +17.6 composite points
Contract Governance scores 23.5 — up to +9.2 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/lemmy/apis.yml: open an issue on github.com/api-evangelist/lemmy 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	undeclared	-	-	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 14

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

Lemmy Account API

User account management and settings

Lemmy Admin API

Administrative actions

Lemmy Authentication API

Account registration, login, and password management

Lemmy Comment API

Creating and managing comments

Lemmy Community API

Community management and discovery

Lemmy Federation API

ActivityPub federation and cross-instance operations

Lemmy Images API

Image upload and retrieval

Lemmy Notifications API

User notifications and alerts

Lemmy Person API

User profiles and discovery

Lemmy Post API

Creating and managing posts

Lemmy Private Messages API

Direct messaging between users

Lemmy Reports API

Content reporting and moderation

Lemmy Search API

Search across posts, comments, communities, and users

Lemmy Site API

Site-level information and configuration

Scroll for all 14

Open Collections 14

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

Lemmy REST Account API

OPEN COLLECTION

Lemmy REST Account Admin API

OPEN COLLECTION

Lemmy REST Account Authentication API

OPEN COLLECTION

Lemmy REST Account Comment API

OPEN COLLECTION

Lemmy REST Account Community API

OPEN COLLECTION

Lemmy REST Account Federation API

OPEN COLLECTION

Lemmy REST Account Images API

OPEN COLLECTION

Lemmy REST Account Notifications API

OPEN COLLECTION

Lemmy REST Account Person API

OPEN COLLECTION

Lemmy REST Account Post API

OPEN COLLECTION

Lemmy REST Account Private Messages API

OPEN COLLECTION

Lemmy REST Account Reports API

OPEN COLLECTION

Lemmy REST Account Search API

OPEN COLLECTION

Lemmy REST Account Site API

OPEN COLLECTION

Scroll for all 14

Lemmy API pricing

Not yet checked against Lemmy's own pricing page. Compiled by API Evangelist on 2026-06-13 from join-lemmy.org/; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Lemmy API — Free (Public Instance) free	Free
Lemmy — Self-Hosted free	Free
Lemmy — Managed Hosting (Third-Party) paid	—

Plan details, limits and sources →

Rate limits

Comments: 50 requests
Search: 100 requests
Messages (private messages): 30 requests

Compiled by API Evangelist, not yet checked against Lemmy's documentation. All 6 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Lemmy Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Lemmy Rate Limits

6 limits

RATE LIMITS

Service Levels 1

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

Lemmy

SLA

FinOps 1

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

Lemmy Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Lemmy Context

34 classes · 34 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Lemmy — jsonschema rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 3

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

Comment

13 properties

JSON SCHEMA

Community

17 properties

JSON SCHEMA

Post

21 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Create Post

4 fields

EXAMPLE

Login

5 fields

EXAMPLE

Search

4 fields

EXAMPLE

Security Posture 2

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

Lemmy Authentication

http · 1 scheme

SECURITY

Lemmy Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Lemmy Agentic Access

52 operations · 32 acting · 1 human-in-the-loop

52 operations · 32 acting

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

GitHubOrganization

GitHubOrganization

GitHubRepository

GitHubRepository

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

License

License

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

ActivityPub

ActivityPub

Source (apis.yml)

aid: lemmy
name: Lemmy
description: Lemmy is a free, open-source, self-hostable federated link aggregator and discussion platform built as a Reddit
  alternative. It exposes a versioned REST API at /api/v4/ for creating posts, commenting, managing communities, voting, searching,
  and administering instances. Lemmy federates across the Fediverse using the ActivityPub protocol, allowing users on different
  Lemmy instances and compatible platforms (Mastodon, PeerTube, Friendica) to interact without a central server. Each instance
  operator configures their own rate limits; default limits include 50 comments per 10 minutes, 100 searches per 10 minutes,
  and 5 new registrations per day. Authentication uses JWT bearer tokens obtained via the login endpoint. The software is
  licensed under AGPL-3.0 and written in Rust with an Actix web framework backend.
type: Index
deliveryModel:
  model: open-core
  license: AGPL-3.0
  license_evidence:
    repo: lemmynet/lemmy
    spdx: AGPL-3.0
    stars: 14611
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: medium
  source:
  - openapi
  - pricing
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/lemmy.png
tags:
- Community
- Federated
- Fediverse
- Link Aggregator
- Open Source
- Social Network
tags_raw:
- Communities
- Federated
- Fediverse
- Link Aggregator
- Open-Source
- Social Networks
url: https://raw.githubusercontent.com/api-evangelist/lemmy/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
apis:
- aid: lemmy:lemmy-account-api
  name: Lemmy Account API
  description: User account management and settings
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/lemmy-account-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-admin-api
  name: Lemmy Admin API
  description: Administrative actions
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Admin
  properties:
  - type: OpenAPI
    url: openapi/lemmy-admin-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-authentication-api
  name: Lemmy Authentication API
  description: Account registration, login, and password management
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/lemmy-authentication-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-comment-api
  name: Lemmy Comment API
  description: Creating and managing comments
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Comment
  properties:
  - type: OpenAPI
    url: openapi/lemmy-comment-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-community-api
  name: Lemmy Community API
  description: Community management and discovery
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Community
  properties:
  - type: OpenAPI
    url: openapi/lemmy-community-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-federation-api
  name: Lemmy Federation API
  description: ActivityPub federation and cross-instance operations
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Federation
  properties:
  - type: OpenAPI
    url: openapi/lemmy-federation-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-images-api
  name: Lemmy Images API
  description: Image upload and retrieval
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Image
  tags_raw:
  - Images
  properties:
  - type: OpenAPI
    url: openapi/lemmy-images-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-notifications-api
  name: Lemmy Notifications API
  description: User notifications and alerts
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Notification
  tags_raw:
  - Notifications
  properties:
  - type: OpenAPI
    url: openapi/lemmy-notifications-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-person-api
  name: Lemmy Person API
  description: User profiles and discovery
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Persons
  tags_raw:
  - Person
  properties:
  - type: OpenAPI
    url: openapi/lemmy-person-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-post-api
  name: Lemmy Post API
  description: Creating and managing posts
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags: []
  tags_raw:
  - Post
  properties:
  - type: OpenAPI
    url: openapi/lemmy-post-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-private-messages-api
  name: Lemmy Private Messages API
  description: Direct messaging between users
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Private Messages
  properties:
  - type: OpenAPI
    url: openapi/lemmy-private-messages-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-reports-api
  name: Lemmy Reports API
  description: Content reporting and moderation
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Reports
  properties:
  - type: OpenAPI
    url: openapi/lemmy-reports-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-search-api
  name: Lemmy Search API
  description: Search across posts, comments, communities, and users
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/lemmy-search-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
- aid: lemmy:lemmy-site-api
  name: Lemmy Site API
  description: Site-level information and configuration
  humanURL: https://join-lemmy.org/docs/
  baseURL: https://lemmy.world/api/v4
  tags:
  - Site
  properties:
  - type: OpenAPI
    url: openapi/lemmy-site-api-openapi.yml
  - type: Documentation
    url: https://join-lemmy.org/docs/
  - type: Authentication
    url: https://join-lemmy.org/docs/client_development/authentication.html
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy
  - type: GitHubRepository
    url: https://github.com/LemmyNet/lemmy-js-client
  - type: JSONSchema
    url: json-schema/post.json
  - type: JSONSchema
    url: json-schema/comment.json
  - type: JSONSchema
    url: json-schema/community.json
  - type: JSONLDContext
    url: json-ld/lemmy-context.jsonld
  - type: Vocabulary
    url: vocabulary/lemmy-vocabulary.yml
  - type: Examples
    url: examples/login.json
  - type: Examples
    url: examples/create-post.json
  - type: Examples
    url: examples/search.json
  - type: RateLimits
    url: rate-limits/lemmy-rate-limits.yml
  - type: Plans
    url: plans/lemmy-plans-pricing.yml
  - type: FinOps
    url: finops/lemmy-finops.yml
common:
- type: IssueTracker
  url: https://github.com/LemmyNet/lemmy/issues
- type: Releases
  url: https://github.com/LemmyNet/lemmy/releases
- type: SecurityPolicy
  url: https://github.com/LemmyNet/lemmy/blob/main/.github/SECURITY.md
- type: AgenticAccess
  url: agentic-access/lemmy-agentic-access.yml
- type: DomainSecurity
  url: security/lemmy-domain-security.yml
- type: Authentication
  url: authentication/lemmy-authentication.yml
- type: GitHubOrganization
  url: https://github.com/LemmyNet
- type: Website
  url: https://join-lemmy.org
- type: Documentation
  url: https://join-lemmy.org/docs/
- type: GettingStarted
  url: https://join-lemmy.org/docs/client_development/
- type: License
  url: https://github.com/LemmyNet/lemmy/blob/main/LICENSE
- type: Blog
  url: https://join-lemmy.org/news/
- type: RateLimits
  url: rate-limits/lemmy-rate-limits.yml
- type: Plans
  url: plans/lemmy-plans-pricing.yml
- type: FinOps
  url: finops/lemmy-finops.yml
- type: GitHubRepository
  url: https://github.com/LemmyNet/lemmy
- type: ActivityPub
  url: https://www.w3.org/TR/activitypub/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Lemmy API — frequently asked questions

Does Lemmy have an API?

Yes. APIs.io lists 14 APIs from Lemmy, including Lemmy Account API, Lemmy Admin API and Lemmy Authentication API, and 11 more.

Is there an OpenAPI specification for the Lemmy API?

Yes. APIs.io indexes 14 OpenAPI specifications for Lemmy, each linked for download from this page.

How do I authenticate with the Lemmy API?

Lemmy uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Lemmy Authentication.

How much does the Lemmy API cost?

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

Is the Lemmy API ready for AI agents?

Lemmy has a Kin Score of 34.3 out of 100 (thin) and an Agent Readiness score of 20.9 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

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One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

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.

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Call it yourself

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

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Every operation they expose

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

How their score was established

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

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