Google Calendar

The Google Calendar API provides RESTful access to Google Calendar data, enabling applications to create, view, and manage calendar events, access control lists, and user settings. It supports creating and managing multiple calendars, querying free/busy information, setting up push notifications for changes, and integrating calendar functionality into third-party applications.

Google Calendar publishes 4 API contracts indexed on the APIs.io network, including Calendars API, Colors API, Users API, and 1 more. Tagged areas include Availability, Calendar, Event, Google, and Google Workspace.

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

Google Calendar’s developer surface includes developer portal, getting-started guide, documentation, authentication, pricing, support, engineering blog, and 13 more developer resources.

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48.8/100 developing ▬ flat Agent 21/100 agent aware saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract

Availability Calendar Event Google Google Workspace Scheduling

Kin Score

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

Composite quality — 48.8/100 · developing

Contract Quality 10.4 / 19

Developer Ergonomics 7.7 / 15

Access Clarity 7.9 / 15

Operational Transparency 3.6 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 4.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 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 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

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)
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 55.6 — up to +11.1 composite points
Contract Governance scores 9.8 — up to +10.8 composite points
Developer Ergonomics scores 51.2 — up to +9.8 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/google-calendar/apis.yml: open an issue on github.com/api-evangelist/google-calendar 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Raycast Store Extensions (first-party publishers + community-wrapped products)	covered	11.7	-	-
Smartsheet Marketplace (connectors and partner-built solutions on Smartsheet)	covered	11.7	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

Google Calendar Calendars API

The Calendars API from Google Calendar — 6 operation(s) for calendars.

Google Calendar Colors API

The Colors API from Google Calendar — 1 operation(s) for colors.

Google Calendar Users API

The Users API from Google Calendar — 2 operation(s) for users.

Google Calendar Free Busy API

The Free Busy API from Google Calendar — 1 operation(s) for free busy.

Postman Collections 4

Ready-to-run Postman collections for exercising this provider's APIs.

Google Calendar Calendars API

POSTMAN

Google Calendar Calendars Colors API

POSTMAN

Google Calendar Calendars freeBusy API

POSTMAN

Google Calendar Calendars Users API

POSTMAN

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Google Calendar Calendars API

OPEN COLLECTION

Google Calendar Calendars Colors API

OPEN COLLECTION

Google Calendar Calendars freeBusy API

OPEN COLLECTION

Google Calendar Calendars Users API

OPEN COLLECTION

Google Calendar API

OPEN COLLECTION

Google Calendar API pricing

Prices published by Google Calendar, read 2026-10-28 from developers.google.com/workspace/calendar/api/guides/quota.

Plan	Price
Standard Calendar API use	All standard use of the Google Calendar API is available at no additional cost. Includes: Up to 1,000,000 requests per day per project before charges apply

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Google Calendar's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Google Calendar Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Google Calendar Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Google Calendar

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Google Calendar Finops

FINOPS

Semantic Vocabularies 1

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

Json Ld Context

4 classes · 4 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Google Calendar — jsonschema rules

6 rules · 4 warnings 2 info

SPECTRAL

Security Posture 2

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

Google Calendar Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Google Calendar Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Google Calendar Agentic Access

18 operations · 10 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Support

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: google-calendar
name: Google Calendar
description: The Google Calendar API provides RESTful access to Google Calendar data, enabling applications to create, view,
  and manage calendar events, access control lists, and user settings. It supports creating and managing multiple calendars,
  querying free/busy information, setting up push notifications for changes, and integrating calendar functionality into third-party
  applications.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/google-calendar.png
url: https://raw.githubusercontent.com/api-evangelist/google-calendar/refs/heads/main/apis.yml
created: '2026-03-13'
modified: '2026-05-19'
specificationVersion: '0.23'
type: Index
tags:
- Availability
- Calendar
- Event
- Google
- Google Workspace
- Scheduling
tags_raw:
- Availability
- Calendar
- Events
- Google
- Google Workspace
- Scheduling
apis:
- aid: google-calendar:google-calendar-calendars-api
  name: Google Calendar Calendars API
  description: The Calendars API from Google Calendar — 6 operation(s) for calendars.
  humanURL: https://developers.google.com/workspace/calendar/api/guides/overview
  baseURL: https://www.googleapis.com/calendar/v3
  tags:
  - Calendar
  tags_raw:
  - Calendars
  properties:
  - type: OpenAPI
    url: openapi/google-calendar-calendars-api-openapi.yml
  - type: Documentation
    url: https://developers.google.com/workspace/calendar/api/guides/overview
  - type: Authentication
    url: https://developers.google.com/workspace/calendar/api/auth
  - type: GettingStarted
    url: https://developers.google.com/workspace/calendar/api/quickstart/python
  - type: JSONSchema
    url: json-schema/json-schema.yml
  - type: JSONLD
    url: json-ld/json-ld.jsonld
- aid: google-calendar:google-calendar-colors-api
  name: Google Calendar Colors API
  description: The Colors API from Google Calendar — 1 operation(s) for colors.
  humanURL: https://developers.google.com/workspace/calendar/api/guides/overview
  baseURL: https://www.googleapis.com/calendar/v3
  tags:
  - Colors
  properties:
  - type: OpenAPI
    url: openapi/google-calendar-colors-api-openapi.yml
  - type: Documentation
    url: https://developers.google.com/workspace/calendar/api/guides/overview
  - type: Authentication
    url: https://developers.google.com/workspace/calendar/api/auth
  - type: GettingStarted
    url: https://developers.google.com/workspace/calendar/api/quickstart/python
  - type: JSONSchema
    url: json-schema/json-schema.yml
  - type: JSONLD
    url: json-ld/json-ld.jsonld
- aid: google-calendar:google-calendar-users-api
  name: Google Calendar Users API
  description: The Users API from Google Calendar — 2 operation(s) for users.
  humanURL: https://developers.google.com/workspace/calendar/api/guides/overview
  baseURL: https://www.googleapis.com/calendar/v3
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/google-calendar-users-api-openapi.yml
  - type: Documentation
    url: https://developers.google.com/workspace/calendar/api/guides/overview
  - type: Authentication
    url: https://developers.google.com/workspace/calendar/api/auth
  - type: GettingStarted
    url: https://developers.google.com/workspace/calendar/api/quickstart/python
  - type: JSONSchema
    url: json-schema/json-schema.yml
  - type: JSONLD
    url: json-ld/json-ld.jsonld
- aid: google-calendar:google-calendar-free-busy-api
  name: Google Calendar Free Busy API
  description: The Free Busy API from Google Calendar — 1 operation(s) for free busy.
  humanURL: https://developers.google.com/workspace/calendar/api/guides/overview
  baseURL: https://www.googleapis.com/calendar/v3
  tags:
  - Free Busy
  properties:
  - type: OpenAPI
    url: openapi/google-calendar-free-busy-api-openapi.yml
  - type: Documentation
    url: https://developers.google.com/workspace/calendar/api/guides/overview
  - type: Authentication
    url: https://developers.google.com/workspace/calendar/api/auth
  - type: GettingStarted
    url: https://developers.google.com/workspace/calendar/api/quickstart/python
  - type: JSONSchema
    url: json-schema/json-schema.yml
  - type: JSONLD
    url: json-ld/json-ld.jsonld
common:
- type: Plans
  url: plans/google-calendar-plans-pricing.yml
- type: RateLimits
  url: rate-limits/google-calendar-rate-limits.yml
- type: FinOps
  url: finops/google-calendar-finops.yml
- type: Website
  url: https://www.google.com/
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/google-calendar/overview
- type: AgenticAccess
  url: agentic-access/google-calendar-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/google-calendar-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/google-calendar-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/googleworkspace
- type: Portal
  url: https://developers.google.com/workspace/calendar
- type: GettingStarted
  url: https://developers.google.com/workspace/calendar/api/guides/overview
- type: Documentation
  url: https://developers.google.com/workspace/calendar/api/reference/rest
- type: Authentication
  url: https://developers.google.com/identity/protocols/oauth2
- type: Pricing
  url: https://developers.google.com/workspace/calendar/api/guides/quota
- type: TermsOfService
  url: https://developers.google.com/terms
- type: PrivacyPolicy
  url: https://policies.google.com/privacy
- type: StatusPage
  url: https://www.google.com/appsstatus/dashboard/
- type: Support
  url: https://developers.google.com/workspace/calendar/api/support
- type: Blog
  url: https://workspaceupdates.googleblog.com/
- type: JSONLD
  url: json-ld/json-ld.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: google
x-relationship: product

Google Calendar API — frequently asked questions

Does Google Calendar have an API?

Yes. APIs.io lists 4 APIs from Google Calendar, including Google Calendar Calendars API, Google Calendar Colors API and Google Calendar Users API, and 1 more.

Is there an OpenAPI specification for the Google Calendar API?

Yes. APIs.io indexes 4 OpenAPI specifications for Google Calendar, each linked for download from this page.

How do I authenticate with the Google Calendar API?

Google Calendar uses bearer-token authentication.

How much does the Google Calendar API cost?

Google Calendar publishes its prices; its Standard Calendar API use plan is All standard use of the Google Calendar API is available at no additional cost. as of 2026-10-28. APIs.io lists 1 pricing plan for Google Calendar, with each plan's price, limits and inclusions under Pricing on this page.

Is the Google Calendar API ready for AI agents?

Google Calendar has a Kin Score of 48.8 out of 100 (developing) and an Agent Readiness score of 20.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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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.
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