CielStay

CielStay provides a free AI-powered index for direct booking homes, aggregating over 90,000 properties for short‑term, seasonal, or long‑term stays. Users can search by preferences, location, or through their own AI agents, accessing listings across all channels without intermediary fees. The platform aims to simplify vacation rentals by offering transparent, AI‑enhanced discovery and direct booking options.

CielStay is listed with 2 APIs on the APIs.io network. Tagged areas include Vacation Rentals, Artificial Intelligence, Direct Booking, Real Estate, and Travel.

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

CielStay’s developer surface includes documentation, API reference, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

13.0/100 emerging Agent 18/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

2 APIs 1 MCP Servers

Vacation Rentals Artificial Intelligence Direct Booking Real Estate Travel

Kin Score

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

Composite quality — 13.0/100 · emerging

Contract Quality 3.5 / 21

Developer Ergonomics 1.4 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.5 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 0 / 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

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

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 16.4 — up to +20.9 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 8.3 — up to +18.3 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/cielstay-com/apis.yml: open an issue on github.com/api-evangelist/cielstay-com 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 →

Standards implemented 2

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (documented)

APIs 2

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

CielStay Agent API

Search 70,000+ independently-owned stays and retrieve every way to book each one, including the host's own direct booking site. CielStay never processes payments and takes no co...

CielStay API

CielStay API as documented publicly: 7 operations. Contract generated from the documentation by API Evangelist (2026-11-03); not the provider's own document.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

CielStay MCP Server

Remote MCP server at mcp.cielstay.com.

MCP SERVER

Semantic Vocabularies 1

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

Cielstay Com Context

1 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

CielStay API Rules

37 rules · 35 errors 1 warnings 1 info

SPECTRAL

JSON Schema 1

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

GetApiV1ListingsIdLiveQuoteResponse

1 properties

JSON SCHEMA

Security Posture 1

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

Cielstay Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

MCPServer

WellKnown

MCP

llms

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 1

Authentication, authorization, and security posture

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: cielstay-com
name: CielStay
description: CielStay provides a free AI-powered index for direct booking homes, aggregating over 90,000 properties for short‑term,
  seasonal, or long‑term stays. Users can search by preferences, location, or through their own AI agents, accessing listings
  across all channels without intermediary fees. The platform aims to simplify vacation rentals by offering transparent, AI‑enhanced
  discovery and direct booking options.
url: https://artifacts.apis.io/cielstay-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: unreadable
  source:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Vacation Rentals
- Artificial Intelligence
- Direct Booking
- Real Estate
- Travel
tags_raw:
- Vacation Rentals
- AI
- Direct Booking
- Real Estate
- Travel
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/cielstay-com-rules.yml
- type: JSONLD
  url: json-ld/cielstay-com-context.jsonld
- type: Vocabulary
  url: vocabulary/cielstay-com-vocabulary.yml
- type: DataModel
  url: data-model/cielstay-com-data-model.yml
- type: Conformance
  url: conformance/cielstay-com-conformance.yml
- type: LLMsTxt
  url: llms/cielstay-com-llms.txt
- type: MCPServer
  url: mcp/cielstay-com-mcp.yml
- type: WellKnown
  url: well-known/cielstay-com-well-known.yml
- type: Hosts
  url: hosts/cielstay-com-hosts.yml
- type: Vendors
  url: vendors/cielstay-com-vendors.yml
- type: DomainSecurity
  url: security/cielstay-com-domain-security.yml
- type: Website
  url: https://www.cielstay.com/
- type: Documentation
  url: https://www.cielstay.com/ai-agent-guide
- type: APIReference
  url: https://www.cielstay.com/api/v1
- type: MCP
  url: https://mcp.cielstay.com/mcp
- type: llms
  url: https://www.cielstay.com/llms.txt
apis:
- name: CielStay Agent API
  description: Search 70,000+ independently-owned stays and retrieve every way to book each one, including the host's own
    direct booking site. CielStay never processes payments and takes no commission.
  humanURL: https://www.cielstay.com/api/v1
  baseURL: https://api.cielstay.com/api/v1
  aid: cielstay-com:cielstay-agent-api
- aid: cielstay-com:cielstay-com-api
  name: CielStay API
  description: 'CielStay API as documented publicly: 7 operations. Contract generated from the documentation by API Evangelist
    (2026-11-03); not

    the provider''s own document.'
  humanURL: https://www.cielstay.com/api/v1
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/cielstay-com-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/cielstay-com-get-api-v1-listings-id-live-quote-response-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Provider offers JSON API reference but no OpenAPI or other machine-readable contract.
  evidence:
  - url: https://www.cielstay.com/api/v1
    status: 200
  checked: '2026-11-03'
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 22
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

CielStay API — frequently asked questions

Does CielStay have an API?

Yes. APIs.io lists 2 APIs from CielStay, including CielStay Agent API and CielStay API.

Is there an OpenAPI specification for the CielStay API?

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

Does CielStay have an MCP server?

Yes. APIs.io lists 1 MCP server for CielStay: Remote MCP server at mcp.cielstay.com.

Is the CielStay API ready for AI agents?

CielStay has a Kin Score of 13.0 out of 100 (emerging) and an Agent Readiness score of 17.8 (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.

MCP server

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.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/cielstay-com"

All providers

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

Every operation they expose

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

How their score was established

curl "https://apis.io/api/v1/providers/cielstay-com/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.