Immowelt

Immowelt is a leading German online real‑estate marketplace that connects property seekers with landlords, real‑estate agents and developers. The platform offers listings for apartments, houses, and commercial spaces across Germany and Austria, providing tools for searching, filtering, and contacting sellers. Immowelt also supplies market data, price trends, and a range of services for both private users and professional partners, positioning itself as a central hub in the European property market.

Immowelt publishes 1 API contract indexed on the APIs.io network. Tagged areas include Real Estate, Marketplace, Germany, Austria, and Property Listings.

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

Immowelt’s developer surface includes authentication, documentation, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.4/100 emerging Agent 19/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

4 published contracts 4 Agent Skills

Real Estate Marketplace Germany Austria Property Listings

Kin Score

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

Composite quality — 22.4/100 · emerging

Contract Quality 4.4 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.9 / 10

Discoverability 5.8 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 0 / 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 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Contract Quality scores 20.7 — up to +19.8 composite points
Developer Ergonomics scores 21.4 — up to +15.7 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/immowelt/apis.yml: open an issue on github.com/api-evangelist/immowelt 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 1

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

Immowelt API

Immowelt provides RESTful APIs for real‑estate listings, import/export of listings, and seeker leads, as described in the developer portal.

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

immowelt-export-listings

AGENT SKILL

immowelt-import-listings

AGENT SKILL

immowelt-ingest-lead

AGENT SKILL

immowelt-seeker-leads

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Immowelt Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Immowelt Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

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

Immowelt Context

40 classes · 257 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Immowelt API Rules

18 rules · 15 errors 2 warnings 1 info

SPECTRAL

OpenAPI Overlays 4

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Immowelt Export Listings Overlay

3 actions · update · immowelt-export-listings-openapi.yml

GENERATED

Immowelt Import Listings Overlay

3 actions · update · immowelt-import-listings-openapi.yml

GENERATED

Immowelt Seeker Leads Ingest Overlay

2 actions · update · immowelt-seeker-leads-ingest-openapi.yml

GENERATED

Immowelt Seeker Leads Overlay

5 actions · update · immowelt-seeker-leads-openapi.yml

GENERATED

JSON Schema 15

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

apiRequest

4 properties

JSON SCHEMA

createLeadRequest

9 properties

JSON SCHEMA

GetExportStatusResponse

3 properties

JSON SCHEMA

listingResponse

1 properties

JSON SCHEMA

mediaPresignedUrlRequest

2 properties

JSON SCHEMA

mediaPresignedUrlResponse

2 properties

JSON SCHEMA

passHealthResponse

0 properties

JSON SCHEMA

projectResponse

5 properties

JSON SCHEMA

RequestListingsExportRequest

1 properties

JSON SCHEMA

RequestListingsExportResponse

1 properties

JSON SCHEMA

webhookAuditResponse

7 properties

JSON SCHEMA

webhookSubscriptionAddRequest

3 properties

JSON SCHEMA

webhookSubscriptionListResponse

2 properties

JSON SCHEMA

webhookSubscriptionResponse

5 properties

JSON SCHEMA

webhookSubscriptionUpdateRequest

2 properties

JSON SCHEMA

Scroll for all 15

Security Posture 3

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

Immowelt Authentication

1 scheme

SECURITY

Immowelt Domain Security

TLSv1.3 · DMARC

SECURITY

Immowelt Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Immowelt Scopes

15 scopes

SCOPES

Agentic Access 1

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

Immowelt Agentic Access

14 operations · 9 acting · 1 human-in-the-loop

14 operations · 9 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

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: immowelt
name: Immowelt
description: Immowelt is a leading German online real‑estate marketplace that connects property seekers with landlords, real‑estate
  agents and developers. The platform offers listings for apartments, houses, and commercial spaces across Germany and Austria,
  providing tools for searching, filtering, and contacting sellers. Immowelt also supplies market data, price trends, and
  a range of services for both private users and professional partners, positioning itself as a central hub in the European
  property market.
url: https://artifacts.apis.io/immowelt/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:
- Real Estate
- Marketplace
- Germany
- Austria
- Property Listings
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Security
  url: security/immowelt-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/immowelt-authentication.yml
- type: LLMsTxt
  url: llms/immowelt-llms.txt
- type: SecurityTxt
  url: well-known/immowelt-security.txt
- type: WellKnown
  url: well-known/immowelt-well-known.yml
- type: Hosts
  url: hosts/immowelt-hosts.yml
- type: Vendors
  url: vendors/immowelt-vendors.yml
- type: Documentation
  url: https://developers.immowelt.de/
- type: VulnerabilityDisclosure
  url: security/immowelt-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/immowelt-domain-security.yml
- type: Website
  url: https://immowelt.de/
apis:
- name: Immowelt API
  description: Immowelt provides RESTful APIs for real‑estate listings, import/export of listings, and seeker leads, as described
    in the developer portal.
  humanURL: https://www.developers.immowelt.de/
  baseURL: https://apim.immowelt.de/
  aid: immowelt:immowelt-api
x-submission-probe: 403, 2026-10-26
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The Immowelt developer portal provides documentation but the API base URL https://apim.immowelt.de/ returns HTTP
    403 and no OpenAPI spec is publicly available.
  evidence:
  - url: https://apim.immowelt.de/
    status: 403
  checked: '2026-10-28'
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 12
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Immowelt API — frequently asked questions

Does Immowelt have an API?

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

How do I authenticate with the Immowelt API?

Immowelt documents its authentication (1 scheme). The details are profiled on APIs.io as Immowelt Authentication.

Is the Immowelt API ready for AI agents?

Immowelt has a Kin Score of 22.4 out of 100 (emerging) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-10-31.

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Tools for providers

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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.
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