Kleinanzeigen

Kleinanzeigen is a German online classifieds platform that allows users to post free advertisements for a wide range of items and services, from furniture and electronics to jobs and real estate. Formerly known as eBay Kleinanzeigen, it connects local buyers and sellers, offering a simple, searchable marketplace without fees. The service emphasizes community-driven listings and supports categories such as vehicles, pets, and services, aiming to facilitate convenient, local transactions across Germany.

Kleinanzeigen is listed with 2 APIs on the APIs.io network. Tagged areas include classifieds, marketplace, Germany, free-ads, and consumer.

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

Kleinanzeigen’s developer surface includes authentication, documentation, support, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.5/100 thin Agent 21/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

classifiedsmarketplaceGermanyfree-adsconsumer

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 28.5/100 · thin

Contract Quality 5.4 / 21

Developer Ergonomics 4.5 / 17

Access Clarity 3.6 / 17

Operational Transparency 1.7 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 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

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

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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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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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)

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 25.2 — up to +18.7 composite points
Access Clarity scores 21.1 — up to +15.8 composite points
Developer Ergonomics scores 26.2 — up to +14.8 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/kleinanzeigen/apis.yml: open an issue on github.com/api-evangelist/kleinanzeigen 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 →

APIs 2

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

Kleinanzeigen Professional Sellers API

API for managing listings, publications, media, and imprints on Kleinanzeigen. Provides operations to create, update, delete, and retrieve listings and related resources.

Kleinanzeigen API

Kleinanzeigen API as documented publicly: 39 operations. Contract generated from the documentation by API Evangelist (2026-10-28); not the provider's own document.

Rate Limits 1

Documented rate limits and quota policies.

Kleinanzeigen Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

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

Kleinanzeigen Context

25 classes · 39 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Kleinanzeigen API Rules

11 rules · 8 errors 2 warnings 1 info

SPECTRAL

JSON Schema 6

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

GetApiGoodsV1ListingsResponse

14 properties

JSON SCHEMA

GetApiGoodsV1Listings123E4567E89B12D3A456426614174000Respons

14 properties

JSON SCHEMA

GetV1ListingsResponse

14 properties

JSON SCHEMA

GetV1ListingsUuidPublicationsResponse

27 properties

JSON SCHEMA

GetV1ListingsUuidResponse

14 properties

JSON SCHEMA

PostV1ListingsRequest

12 properties

JSON SCHEMA

Security Posture 3

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

Kleinanzeigen Authentication

1 scheme

SECURITY

Kleinanzeigen Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Kleinanzeigen Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

Security

Security

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: kleinanzeigen
name: Kleinanzeigen
description: Kleinanzeigen is a German online classifieds platform that allows users to post free advertisements for a wide
  range of items and services, from furniture and electronics to jobs and real estate. Formerly known as eBay Kleinanzeigen,
  it connects local buyers and sellers, offering a simple, searchable marketplace without fees. The service emphasizes community-driven
  listings and supports categories such as vehicles, pets, and services, aiming to facilitate convenient, local transactions
  across Germany.
url: https://artifacts.apis.io/kleinanzeigen/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- classifieds
- marketplace
- Germany
- free-ads
- consumer
image: https://static.kleinanzeigen.de/static/img/common/logo/logo-kleinanzeigen-og-vertical.png
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: SecurityTxt
  url: well-known/kleinanzeigen-adevinta-security.txt
- type: WellKnown
  url: well-known/kleinanzeigen-well-known.yml
- type: Spectral
  url: rules/kleinanzeigen-rules.yml
- type: JSONLD
  url: json-ld/kleinanzeigen-context.jsonld
- type: Vocabulary
  url: vocabulary/kleinanzeigen-vocabulary.yml
- type: DataModel
  url: data-model/kleinanzeigen-data-model.yml
- type: Security
  url: https://adevinta.com/security-vulnerability/
- type: Authentication
  url: authentication/kleinanzeigen-authentication.yml
- type: ErrorCatalog
  url: errors/kleinanzeigen-problem-types.yml
- type: Conformance
  url: conformance/kleinanzeigen-conformance.yml
- type: Hosts
  url: hosts/kleinanzeigen-hosts.yml
- type: Vendors
  url: vendors/kleinanzeigen-vendors.yml
- type: Documentation
  url: https://developer.kleinanzeigen.de/
- type: GitHubOrganization
  url: https://github.com/kleinanzeigen
- type: VulnerabilityDisclosure
  url: security/kleinanzeigen-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/kleinanzeigen-domain-security.yml
- type: Website
  url: https://kleinanzeigen.de/
- type: Support
  url: https://hilfe.kleinanzeigen.de/hc/de
- type: TermsOfService
  url: https://themen.kleinanzeigen.de/impressum/
- type: PrivacyPolicy
  url: https://themen.kleinanzeigen.de/datenschutzerklaerung/
apis:
- name: Kleinanzeigen Professional Sellers API
  description: API for managing listings, publications, media, and imprints on Kleinanzeigen. Provides operations to create,
    update, delete, and retrieve listings and related resources.
  humanURL: https://developer.kleinanzeigen.de/docs/general/
  baseURL: https://developer.kleinanzeigen.de/
  aid: kleinanzeigen:kleinanzeigen-professional-sellers-api
- aid: kleinanzeigen:kleinanzeigen-api
  name: Kleinanzeigen API
  description: 'Kleinanzeigen API as documented publicly: 39 operations. Contract generated from the documentation by API
    Evangelist (2026-10-28);

    not the provider''s own document.'
  humanURL: https://developer.kleinanzeigen.de/docs/listing/api
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/kleinanzeigen-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/kleinanzeigen-get-v1-listings-uuid-publications-response-schema.json
  - type: JSONSchema
    url: json-schema/kleinanzeigen-get-api-goods-v1-listings123-e4567-e89-b12-d3-a456426614174000-respons-schema.json
  - type: JSONSchema
    url: json-schema/kleinanzeigen-get-api-goods-v1-listings-response-schema.json
  - type: JSONSchema
    url: json-schema/kleinanzeigen-post-v1-listings-request-schema.json
  - type: JSONSchema
    url: json-schema/kleinanzeigen-get-v1-listings-response-schema.json
  - type: JSONSchema
    url: json-schema/kleinanzeigen-get-v1-listings-uuid-response-schema.json
x-submission-probe: 200, 2026-10-26
x-coverage:
  state: gated
  reason: partner-login
  detail: OpenAPI spec is gated behind authentication (401 Unauthorized) at https://developer.kleinanzeigen.de/openapi.json.
  evidence:
  - url: https://developer.kleinanzeigen.de/openapi.json
    status: 401
  checked: '2026-10-28'
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Kleinanzeigen API — frequently asked questions

Does Kleinanzeigen have an API?

Yes. APIs.io lists 2 APIs from Kleinanzeigen, including Kleinanzeigen Professional Sellers API and Kleinanzeigen API.

Is there an OpenAPI specification for the Kleinanzeigen API?

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

How do I authenticate with the Kleinanzeigen API?

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

Is the Kleinanzeigen API ready for AI agents?

Kleinanzeigen has a Kin Score of 28.5 out of 100 (thin) and an Agent Readiness score of 20.9 (agent-aware), scored by API Evangelist on 2026-10-31.

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