G-Guest

G-Guest is a booking system for restaurants, salons and studios, offering direct bookings on your own page, a waitlist that refills cancellations, real visit history, reviews and returns. It is AI readable and AI bookable, priced at €49 per month flat with no commission, targeting small businesses seeking a guest layer without marketplace fees.

G-Guest is listed with 2 APIs on the APIs.io network. Tagged areas include Booking, Software-as-a-Service, Small Business, and Hospitality.

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

G-Guest’s developer surface includes API reference and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.1/100 emerging Agent 25/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessApproval

2 APIs 1 MCP Servers

Booking Software-as-a-Service Small Business Hospitality

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 19.1/100 · emerging

Contract Quality 5.0 / 21

Developer Ergonomics 2.3 / 17

Access Clarity 2.9 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.1 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 25/100 · 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 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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/.

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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 Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 23.6 — up to +19.1 composite points Ask about this →
Developer Ergonomics scores 13.6 — up to +17.3 composite points Ask about this →
Access Clarity scores 17.0 — up to +16.6 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/g-guest-app/apis.yml: open an issue on github.com/api-evangelist/g-guest-app 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 2

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

G-Guest Booking API

Book a CONFIRMED slot at a local business in two calls: check availability, then create the booking.

G-Guest API

G-Guest API as documented publicly: 6 operations. Contract generated from the documentation by API Evangelist (2026-11-09); not the provider's own document.

MCP Servers 1

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

G-Guest MCP Server

Remote MCP server at g-guest.app.

MCP SERVER

Semantic Vocabularies 1

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

G Guest App Context

8 classes · 20 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

G-Guest API Rules

38 rules · 36 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 6

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

PostApiCalV1DemoAvailabilityRequest

4 properties

JSON SCHEMA

PostApiCalV1DemoAvailabilityResponse

6 properties

JSON SCHEMA

PostApiCalV1SlugBookingsRequest

7 properties

JSON SCHEMA

PostApiCalV1SlugBookingsResponse

6 properties

JSON SCHEMA

PostApiMcpRequest

4 properties

JSON SCHEMA

PostApiMcpResponse

6 properties

JSON SCHEMA

Security Posture 1

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

G-Guest Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Idempotency

Conventions

Conformance

Scroll for all 7

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

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: g-guest-app
name: G-Guest
description: G-Guest is a booking system for restaurants, salons and studios, offering direct bookings on your own page, a
  waitlist that refills cancellations, real visit history, reviews and returns. It is AI readable and AI bookable, priced
  at €49 per month flat with no commission, targeting small businesses seeking a guest layer without marketplace fees.
url: https://artifacts.apis.io/g-guest-app/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-09 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: approval
  trial: false
  try_now: false
  public: false
  label: Requires approval
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
specificationVersion: '0.20'
created: '2026-11-09'
modified: '2026-11-09'
tags:
- Booking
- Software-as-a-Service
- Small Business
- Hospitality
tags_raw:
- Booking
- SaaS
- SmallBusiness
- AI-Ready
- Hospitality
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://g-guest.app/api/gguest/og?v=default
common:
- type: Spectral
  url: rules/g-guest-app-rules.yml
- type: JSONLD
  url: json-ld/g-guest-app-context.jsonld
- type: Vocabulary
  url: vocabulary/g-guest-app-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/g-guest-app-data-model.yml
- type: Idempotency
  url: conventions/g-guest-app-conventions.yml
- type: Conventions
  url: conventions/g-guest-app-conventions.yml
- type: Conformance
  url: conformance/g-guest-app-conformance.yml
- type: LLMsTxt
  url: llms/g-guest-app-llms.txt
- type: MCPServer
  url: mcp/g-guest-app-mcp.yml
- type: Hosts
  url: hosts/g-guest-app-hosts.yml
- type: Vendors
  url: vendors/g-guest-app-vendors.yml
- type: TermsOfService
  url: https://g-guest.app/terms
- type: PrivacyPolicy
  url: https://g-guest.app/privacy
- type: APIReference
  url: https://g-guest.app/developers
- type: DomainSecurity
  url: security/g-guest-app-domain-security.yml
- type: Website
  url: https://g-guest.app/
apis:
- name: G-Guest Booking API
  description: 'Book a CONFIRMED slot at a local business in two calls: check availability, then create the booking.

    '
  humanURL: https://g-guest.app/developers
  baseURL: https://g-guest.app/api/cal/v1
  properties: []
  aid: g-guest-app:g-guest-booking-api
- aid: g-guest-app:g-guest-app-api
  name: G-Guest API
  description: 'G-Guest API as documented publicly: 6 operations. Contract generated from the documentation by API Evangelist
    (2026-11-09); not

    the provider''s own document.'
  humanURL: https://g-guest.app/developers
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/g-guest-app-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/g-guest-app-post-api-cal-v1-slug-bookings-request-schema.json
  - type: JSONSchema
    url: json-schema/g-guest-app-post-api-cal-v1-demo-availability-response-schema.json
  - type: JSONSchema
    url: json-schema/g-guest-app-post-api-cal-v1-demo-availability-request-schema.json
  - type: JSONSchema
    url: json-schema/g-guest-app-post-api-mcp-request-schema.json
  - type: JSONSchema
    url: json-schema/g-guest-app-post-api-cal-v1-slug-bookings-response-schema.json
  - type: JSONSchema
    url: json-schema/g-guest-app-post-api-mcp-response-schema.json
x-enrichment:
  date: '2026-11-09'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

G-Guest API — frequently asked questions

Does G-Guest have an API?

Yes. APIs.io lists 2 APIs from G-Guest, including G-Guest Booking API and G-Guest API.

Is there an OpenAPI specification for the G-Guest API?

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

Does G-Guest have an MCP server?

Yes. APIs.io lists 1 MCP server for G-Guest: Remote MCP server at g-guest.app.

Is the G-Guest API ready for AI agents?

G-Guest has a Kin Score of 19.1 out of 100 (emerging) and an Agent Readiness score of 24.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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