Callstay

Callstay is a hotel reservation service, operated by Spotbo, Inc. (Delaware, US), that books hotel rooms online or by phone: a guest describes the stay in plain language and Callstay finds the room, arranges details with the property and completes the booking on the guest's behalf. It targets group room blocks, extended weekly or monthly stays, constrained requests (adjoining rooms, accessibility, pets, parking) and company-invoiced bookings, and publishes a public Model Context Protocol server at https://callstay.com/api/mcp for AI agents to search stays, get properties and price rooms.

Callstay is listed with 1 API on the APIs.io network. Tagged areas include Company, Travel, Hotels, Hotel Booking, and Accommodation.

Callstay’s developer surface includes authentication, documentation, support, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

15.5/100 emerging Agent 8/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 1 MCP Servers

Company Travel Hotels Hotel Booking Accommodation Reservations MCP AI Agents

Kin Score

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

Composite quality — 15.5/100 · emerging

Contract Quality 2.6 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.4 / 15

Agent readiness — 8/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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

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.

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/callstay-com/"><img src="https://apis.io/badge/callstay-com/card.svg" alt="Callstay 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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)
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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 12.0 — up to +22.0 composite points
Access Clarity scores 10.5 — up to +17.9 composite points
Developer Ergonomics scores 19.0 — up to +16.2 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/callstay-com/apis.yml: open an issue on github.com/api-evangelist/callstay-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 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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 1

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

Callstay MCP Server

Public Model Context Protocol server (Streamable HTTP, stateless JSON-RPC 2.0) for AI agents to search hotel stays, get property detail and price rooms with all-in totals and bo...

MCP Servers 1

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

Callstay MCP Server

Public Model Context Protocol server operated by Callstay (Spotbo, Inc.) for AI agents to search hotel stays, get property detail and price rooms with all-in totals and booking ...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Callstay Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Callstay Com Rate Limits

0 limits

RATE LIMITS

JSON Schema 5

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

capabilities input

0 properties

JSON SCHEMA

get_property input

1 properties

JSON SCHEMA

price_stay input

7 properties

JSON SCHEMA

search_stays input

9 properties

JSON SCHEMA

Callstay Com Mcp Tools List

0 properties

JSON SCHEMA

Security Posture 2

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

Callstay Com Authentication

2 schemes

SECURITY

Callstay Com Domain Security

TLSv1.3

SECURITY

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

MCPServer

MCPServer

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Lifecycle

Lifecycle

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

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: callstay-com
name: Callstay
description: 'Callstay is a hotel reservation service, operated by Spotbo, Inc. (Delaware, US), that books hotel rooms online
  or by phone: a guest describes the stay in plain language and Callstay finds the room, arranges details with the property
  and completes the booking on the guest''s behalf. It targets group room blocks, extended weekly or monthly stays, constrained
  requests (adjoining rooms, accessibility, pets, parking) and company-invoiced bookings, and publishes a public Model Context
  Protocol server at https://callstay.com/api/mcp for AI agents to search stays, get properties and price rooms.'
url: https://artifacts.apis.io/callstay-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)
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Travel
- Hotels
- Hotel Booking
- Accommodation
- Reservations
- MCP
- AI Agents
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://callstay.com/opengraph-image
common:
- type: Conventions
  url: conventions/callstay-com-conventions.yml
- type: Authentication
  url: authentication/callstay-com-authentication.yml
- type: Lifecycle
  url: lifecycle/callstay-com-lifecycle.yml
- type: LLMsTxt
  url: llms/callstay-com-llms.txt
- type: MCPServer
  url: mcp/callstay-com-mcp.yml
- type: Hosts
  url: hosts/callstay-com-hosts.yml
- type: Vendors
  url: vendors/callstay-com-vendors.yml
- type: DomainSecurity
  url: security/callstay-com-domain-security.yml
- type: Website
  url: https://callstay.com/
- type: Documentation
  url: https://callstay.com/guides
- type: Support
  url: https://callstay.com/contact
- type: TermsOfService
  url: https://callstay.com/terms
- type: PrivacyPolicy
  url: https://callstay.com/privacy
apis:
- aid: callstay-com:callstay-mcp-server
  name: Callstay MCP Server
  description: Public Model Context Protocol server (Streamable HTTP, stateless JSON-RPC 2.0) for AI agents to search hotel
    stays, get property detail and price rooms with all-in totals and booking URLs; tools capabilities, search_stays, get_property
    and price_stay need no key, while agent keys for higher limits and booking tools are requested from partners@callstay.com.
  humanURL: https://callstay.com/llms.txt
  baseURL: https://callstay.com/api/mcp
  tags:
  - MCP
  - Hotels
  - Hotel Booking
  - AI Agents
  properties:
  - type: Documentation
    url: https://callstay.com/llms.txt
  - type: JSONSchema
    url: json-schema/callstay-com-mcp-capabilities-input-schema.json
  - type: JSONSchema
    url: json-schema/callstay-com-mcp-search-stays-input-schema.json
  - type: JSONSchema
    url: json-schema/callstay-com-mcp-get-property-input-schema.json
  - type: JSONSchema
    url: json-schema/callstay-com-mcp-price-stay-input-schema.json
x-coverage:
  state: covered
  reason: identity-verified
  detail: Name and legal entity read from callstay.com title/footer ('© 2026 Callstay. A Spotbo, Inc. company.') and llms.txt;
    all pointers fetched with GET.
  evidence:
  - url: https://callstay.com/
    status: 200
  - url: https://callstay.com/llms.txt
    status: 200
  - url: https://callstay.com/guides
    status: 200
  - url: https://callstay.com/contact
    status: 200
  - url: https://callstay.com/terms
    status: 200
  - url: https://callstay.com/privacy
    status: 200
  - url: https://callstay.com/opengraph-image
    status: 200
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Callstay API — frequently asked questions

Does Callstay have an API?

Yes. APIs.io lists 1 API from Callstay, including Callstay MCP Server.

How do I authenticate with the Callstay API?

Callstay uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as Callstay Com Authentication.

Does Callstay have an MCP server?

Yes. APIs.io lists 1 MCP server for Callstay: Public Model Context Protocol server operated by Callstay (Spotbo, Inc.) for AI agents to search hotel stays, get property detail and price rooms with all-in totals and booking URLs. Search, property

Is the Callstay API ready for AI agents?

Callstay has a Kin Score of 15.5 out of 100 (emerging) and an Agent Readiness score of 8.1 (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/callstay-com"

All providers

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

Every operation they expose

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

How their score was established

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