9flats

9flats is a European vacation-rental marketplace, founded in Hamburg, Germany in 2010, that lists privately-owned apartments, houses and rooms for short-term stays and takes bookings directly from travellers. It operates 9flats.com in multiple languages and, in 2016, combined with its Berlin-based competitor Wimdu. 9flats published a public read API (v1, later v3) covering place search, place detail, photos, prices, reviews, availability calendars, user profiles, favourites and bookings, authenticated with OAuth 1.0a and shipped with a first-party Ruby SDK. That developer surface has decayed: the SDK was last released in 2011 and is marked unsupported by its own maintainers, and the API reference site the SDK links to has been deleted.

9flats is listed with 1 API on the APIs.io network. Tagged areas include Company, Travel, Hospitality, Vacation Rentals, and Short-Term Rental.

9flats’ developer surface includes authentication and 13 more developer resources.

🌐 Visit website📡 Profile data on GitHub
11.2/100 emerging ▬ flat Agent 5/100 human only saas Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0
1 API
CompanyTravelHospitalityVacation RentalsShort-Term RentalAccommodationMarketplaceBookingEurope

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0
Composite quality — 11.2/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 3.2 / 17
Access Clarity 0.0 / 17
Operational Transparency 0.3 / 11
Contract Governance 0.5 / 10
Discoverability 5.3 / 9
Regulatory Posture 2.5 / 15
Agent readiness — 5/100 · human only
Machine-Readable Contract 0 / 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 0 / 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
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/9flats: 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 →

APIs 1

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

9flats API

The 9flats read API over the marketplace's listing data: search places, fetch a place with its photos, prices, reviews and monthly availability calendar, and fetch a user with t...

Pricing Plans 1

Published pricing tiers and plan structures.

9Flats Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

9Flats Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

9Flats Authentication

2 schemes

SECURITY

9Flats Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SourceCode
SourceCode
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 1

Pricing, plans, and the legal terms of use

Plans
Plans

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: 9flats
name: 9flats
description: '9flats is a European vacation-rental marketplace, founded in Hamburg, Germany in 2010, that lists privately-owned
  apartments, houses and rooms for short-term stays and takes bookings directly from travellers. It operates 9flats.com in
  multiple languages and, in 2016, combined with its Berlin-based competitor Wimdu. 9flats published a public read API (v1,
  later v3) covering place search, place detail, photos, prices, reviews, availability calendars, user profiles, favourites
  and bookings, authenticated with OAuth 1.0a and shipped with a first-party Ruby SDK. That developer surface has decayed:
  the SDK was last released in 2011 and is marked unsupported by its own maintainers, and the API reference site the SDK links
  to has been deleted.'
url: https://raw.githubusercontent.com/api-evangelist/9flats/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: 'enrichment pass 2026-09-05: first-party Ruby SDK, GitHub org and OAuth 1.0a auth model found and captured;
  no machine-readable contract published and the live host is behind a Cloudflare managed challenge'
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - 9flats/nineflats-api
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
specificationVersion: '0.20'
created: '2026-09-05'
modified: '2026-09-05'
tags:
- Company
- Travel
- Hospitality
- Vacation Rentals
- Short-Term Rental
- Accommodation
- Marketplace
- Booking
- Europe
apis:
- aid: 9flats:9flats-api
  name: 9flats API
  description: 'The 9flats read API over the marketplace''s listing data: search places, fetch a place with its photos, prices,
    reviews and monthly availability calendar, and fetch a user with their favourites and (for the authenticated user) their
    bookings. Authenticated with OAuth 1.0a plus a client_id query parameter; responses are JSON envelopes keyed by resource
    name with links[] rel/href navigation and page-number pagination. Nine operations, all GET — no write surface is published.
    Reconstructed from 9flats'' own client library, because the reference site the library points at has been withdrawn.'
  humanURL: https://github.com/9flats/nineflats-api
  baseURL: https://www.9flats.com/api/v1
  position: Producing
  tags:
  - Travel
  - Vacation Rentals
  - Search
  - Listings
  - Availability
  - Reviews
  - Booking
  tags_raw:
  - Travel
  - Vacation Rentals
  - Search
  - Listings
  - Availability
  - Reviews
  - Bookings
  properties:
  - type: SourceCode
    url: https://github.com/9flats/nineflats-api
  - type: SDKs
    url: packages/9flats-packages.yml
  - type: Authentication
    url: authentication/9flats-authentication.yml
  - type: Conventions
    url: conventions/9flats-conventions.yml
  - type: DataModel
    url: data-model/9flats-data-model.yml
  - type: RateLimits
    url: rate-limits/9flats-rate-limits.yml
  x-status: Unverified as reachable. The documented base host answers HTTP 403 behind a Cloudflare managed challenge to every
    non-browser client, so no operation could be called; the surface is described from the provider's own SDK source, not
    from a live response.
  x-contract: none published — no OpenAPI, AsyncAPI, GraphQL SDL, WSDL, .proto or Postman collection was found
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/9flats-domain-security.yml
- type: Website
  url: https://www.9flats.com
- type: GitHubOrganization
  url: https://github.com/9flats
- type: SourceCode
  url: https://github.com/9flats/nineflats-api
- type: Packages
  url: packages/9flats-packages.yml
- type: SDKs
  url: packages/9flats-packages.yml
- type: Authentication
  url: authentication/9flats-authentication.yml
- type: Conventions
  url: conventions/9flats-conventions.yml
- type: DataModel
  url: data-model/9flats-data-model.yml
- type: Conformance
  url: conformance/9flats-conformance.yml
- type: Lifecycle
  url: lifecycle/9flats-lifecycle.yml
- type: RateLimits
  url: rate-limits/9flats-rate-limits.yml
- type: Plans
  url: plans/9flats-plans-pricing.yml
- type: LLMsTxt
  url: llms/9flats-llms.txt
x-enrichment:
  date: '2026-09-05'
  status: enriched
  artifacts_added: 11
  pass: local-v3

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