Calendarific

Worldwide public holidays REST API covering 230+ countries. Calendarific provides national, local, religious, and observance holiday data with localization across many ISO-639 languages. Used for ecommerce scheduling, HR systems, travel planning, payroll, and global operations.

Calendarific publishes 3 APIs on the APIs.io network: Countries API, Holidays API, and Languages API. Tagged areas include Calendar, Public APIs, Holidays, Worldwide, and Localization.

The Calendarific catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Calendarific’s developer surface includes authentication, signup flow, pricing, support, tooling, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub

55.6/100 strong ▬ flat Agent 31/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs 7 Features 6 Use Cases

Calendar Public APIs HolidaysWorldwideLocalization

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 55.6/100 · strong

Contract Quality 17.5 / 25

Developer Ergonomics 11.2 / 20

Access Clarity 15.5 / 20

Operational Transparency 0.3 / 13

Contract Governance 3.5 / 12

Discoverability 7.6 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 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 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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APIs 3

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

Calendarific Countries API

List supported countries and their ISO codes.

Calendarific Holidays API

Retrieve holiday data for any country and year.

Calendarific Languages API

List supported languages and their ISO codes.

Postman Collections 3

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

Calendarific Holiday Countries API

POSTMAN

Calendarific Holiday Countries Holidays API

POSTMAN

Calendarific Holiday Countries Languages API

POSTMAN

Open Collections 5

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

API Collection

OPEN COLLECTION

Calendarific Holiday Countries API

OPEN COLLECTION

Calendarific Holiday Countries Holidays API

OPEN COLLECTION

Calendarific Holiday Countries Languages API

OPEN COLLECTION

Calendarific Holiday API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Calendarific Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Calendarific Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Calendarific Finops

FINOPS

Features 7

Notable capabilities this provider offers.

230+ Countries

Coverage of national holidays across more than 230 countries.

Multi-Language Localization

Holiday names and descriptions in many ISO-639 languages (premium).

Holiday Type Filtering

Filter by national, local, religious, or observance categories.

Sub-Region Filtering

Filter by ISO-3166-2 state or region codes.

Historical and Future Data

Holidays from historical years through 2049.

CSV and XLS Export

Download holiday data as flat files in addition to API access.

Multiple API Keys

Multiple keys per account for environment separation.

Scroll for all 7

Semantic Vocabularies 1

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

Calendarific Context

18 classes · 2 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Calendarific API Rules

5 rules · 4 warnings 1 info

SPECTRAL

Calendarific API Rules

6 rules · 2 errors 4 warnings

SPECTRAL

JSON Schema 3

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

Country

5 properties

JSON SCHEMA

Holiday

11 properties

JSON SCHEMA

Language

2 properties

JSON SCHEMA

JSON Structure 3

JSON Structure definitions describing this provider's data shapes.

Calendarific Country Structure

5 properties

JSON STRUCTURE

Calendarific Holiday Structure

10 properties

JSON STRUCTURE

Calendarific Language Structure

2 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Calendarific List Countries Example

2 fields

EXAMPLE

Calendarific List Holidays Example

2 fields

EXAMPLE

Calendarific List Languages Example

2 fields

EXAMPLE

Security Posture 2

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

Calendarific Authentication

apiKey · 1 scheme

SECURITY

Calendarific Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Calendarific Agentic Access

3 operations

3 operations · 0 acting

AGENTIC

Use Cases 6

What developers build with this provider.

Ecommerce Scheduling

Plan promotions, shipping cutoffs, and customer service hours around local holidays.

HR and Payroll

Populate localized leave calendars and statutory holiday pay.

Travel Planning

Surface holiday windows that affect bookings, demand, and pricing.

Workforce Scheduling

Plan global team staffing around local public holidays.

Calendar Sync

Hydrate enterprise calendars (Google, Outlook) with localized holidays.

Financial Markets

Identify country-specific trading and settlement closures.

Integrations 4

Pre-built integrations with other platforms and tools.

Google Calendar

Imported holiday data into Google Calendar via custom calendars.

Microsoft Outlook

Hydrate Outlook calendars with localized holiday events.

Home Assistant

Community Home Assistant sensor uses Calendarific as a data source.

ETL Pipelines

Community ETL examples using Python, SQLite, and Apache Airflow.

Solutions 2

Packaged solutions this provider offers.

Developer API

REST API for embedding holiday data into apps and services.

Data Downloads

CSV and XLS bulk exports for analytics and offline use.

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Signup

Signup

Login

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

Vocabulary

Vocabulary

Build 11

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

SDKs

SDKs

SDKs

SDKs

SDKs

SDKs

SDKs

SDKs

Tools

Scroll for all 11

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Contact

Contact

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

Plans

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: calendarific
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/calendarific.png
name: Calendarific
description: Worldwide public holidays REST API covering 230+ countries. Calendarific provides national, local, religious,
  and observance holiday data with localization across many ISO-639 languages. Used for ecommerce scheduling, HR systems,
  travel planning, payroll, and global operations.
url: https://calendarific.com/
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-05-29'
x-source: public-apis/public-apis
x-category: Calendar
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
tags:
- Calendar
- Public APIs
- Holidays
- Worldwide
- Localization
apis:
- aid: calendarific:calendarific-countries-api
  name: Calendarific Countries API
  description: List supported countries and their ISO codes.
  humanURL: https://calendarific.com/api-documentation
  baseURL: https://calendarific.com/api/v2
  tags:
  - Countries
  properties:
  - type: OpenAPI
    url: openapi/calendarific-countries-api-openapi.yml
  - type: Documentation
    url: https://calendarific.com/api-documentation
  - type: APIReference
    url: https://calendarific.com/api-documentation
  - type: JSONSchema
    url: json-schema/calendarific-holiday-schema.json
  - type: JSONSchema
    url: json-schema/calendarific-country-schema.json
  - type: JSONSchema
    url: json-schema/calendarific-language-schema.json
  - type: JSONStructure
    url: json-structure/calendarific-holiday-structure.json
  - type: JSONStructure
    url: json-structure/calendarific-country-structure.json
  - type: JSONStructure
    url: json-structure/calendarific-language-structure.json
  - type: JSONLD
    url: json-ld/calendarific-context.jsonld
  - type: Examples
    url: examples/calendarific-list-holidays-example.json
  - type: Examples
    url: examples/calendarific-list-countries-example.json
  - type: Examples
    url: examples/calendarific-list-languages-example.json
  - type: Authentication
    url: https://calendarific.com/api-documentation
  - type: RateLimits
    url: rate-limits/calendarific-rate-limits.yml
- aid: calendarific:calendarific-holidays-api
  name: Calendarific Holidays API
  description: Retrieve holiday data for any country and year.
  humanURL: https://calendarific.com/api-documentation
  baseURL: https://calendarific.com/api/v2
  tags:
  - Holidays
  properties:
  - type: OpenAPI
    url: openapi/calendarific-holidays-api-openapi.yml
  - type: Documentation
    url: https://calendarific.com/api-documentation
  - type: APIReference
    url: https://calendarific.com/api-documentation
  - type: JSONSchema
    url: json-schema/calendarific-holiday-schema.json
  - type: JSONSchema
    url: json-schema/calendarific-country-schema.json
  - type: JSONSchema
    url: json-schema/calendarific-language-schema.json
  - type: JSONStructure
    url: json-structure/calendarific-holiday-structure.json
  - type: JSONStructure
    url: json-structure/calendarific-country-structure.json
  - type: JSONStructure
    url: json-structure/calendarific-language-structure.json
  - type: JSONLD
    url: json-ld/calendarific-context.jsonld
  - type: Examples
    url: examples/calendarific-list-holidays-example.json
  - type: Examples
    url: examples/calendarific-list-countries-example.json
  - type: Examples
    url: examples/calendarific-list-languages-example.json
  - type: Authentication
    url: https://calendarific.com/api-documentation
  - type: RateLimits
    url: rate-limits/calendarific-rate-limits.yml
- aid: calendarific:calendarific-languages-api
  name: Calendarific Languages API
  description: List supported languages and their ISO codes.
  humanURL: https://calendarific.com/api-documentation
  baseURL: https://calendarific.com/api/v2
  tags:
  - Language
  tags_raw:
  - Languages
  properties:
  - type: OpenAPI
    url: openapi/calendarific-languages-api-openapi.yml
  - type: Documentation
    url: https://calendarific.com/api-documentation
  - type: APIReference
    url: https://calendarific.com/api-documentation
  - type: JSONSchema
    url: json-schema/calendarific-holiday-schema.json
  - type: JSONSchema
    url: json-schema/calendarific-country-schema.json
  - type: JSONSchema
    url: json-schema/calendarific-language-schema.json
  - type: JSONStructure
    url: json-structure/calendarific-holiday-structure.json
  - type: JSONStructure
    url: json-structure/calendarific-country-structure.json
  - type: JSONStructure
    url: json-structure/calendarific-language-structure.json
  - type: JSONLD
    url: json-ld/calendarific-context.jsonld
  - type: Examples
    url: examples/calendarific-list-holidays-example.json
  - type: Examples
    url: examples/calendarific-list-countries-example.json
  - type: Examples
    url: examples/calendarific-list-languages-example.json
  - type: Authentication
    url: https://calendarific.com/api-documentation
  - type: RateLimits
    url: rate-limits/calendarific-rate-limits.yml
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/calendarific/overview
- type: AgenticAccess
  url: agentic-access/calendarific-agentic-access.yml
- type: DomainSecurity
  url: security/calendarific-domain-security.yml
- type: Authentication
  url: authentication/calendarific-authentication.yml
- type: Website
  url: https://calendarific.com/
- type: DeveloperPortal
  url: https://calendarific.com/api-documentation
- type: Signup
  url: https://calendarific.com/signup
- type: Login
  url: https://calendarific.com/login
- type: Pricing
  url: https://calendarific.com/pricing
- type: Plans
  url: plans/calendarific-plans-pricing.yml
- type: RateLimits
  url: rate-limits/calendarific-rate-limits.yml
- type: TermsOfService
  url: https://calendarific.com/terms
- type: PrivacyPolicy
  url: https://calendarific.com/privacy
- type: Support
  url: https://calendarific.com/contact
- type: Contact
  url: https://calendarific.com/contact
- type: GitHubOrganization
  url: https://github.com/calendarific
- type: SDKs
  name: Python SDK
  url: https://github.com/calendarific/python-calendarific
- type: SDKs
  name: Node.js SDK
  url: https://github.com/calendarific/node-calendarific
- type: SDKs
  name: PHP SDK
  url: https://github.com/calendarific/php-calendarific
- type: SDKs
  name: Ruby SDK
  url: https://github.com/calendarific/ruby-calendarific
- type: SDKs
  name: Go SDK
  url: https://github.com/calendarific/go-calendarific
- type: SDKs
  name: .NET SDK (community)
  url: https://github.com/guibranco/calendarific-sdk-dotnet
- type: SDKs
  name: PowerShell wrapper (community)
  url: https://github.com/rchaganti/PSCalendarific
- type: SDKs
  name: Elixir wrapper (community)
  url: https://github.com/Bounceapp/elixir-calendarific
- type: SpectralRules
  url: rules/calendarific-rules.yml
- type: Vocabulary
  url: vocabulary/calendarific-vocabulary.yml
- type: Tools
  name: Calendarific MCP Server (community)
  url: https://github.com/noalimoy/calendarific-mcp-server
- type: Features
  data:
  - name: 230+ Countries
    description: Coverage of national holidays across more than 230 countries.
  - name: Multi-Language Localization
    description: Holiday names and descriptions in many ISO-639 languages (premium).
  - name: Holiday Type Filtering
    description: Filter by national, local, religious, or observance categories.
  - name: Sub-Region Filtering
    description: Filter by ISO-3166-2 state or region codes.
  - name: Historical and Future Data
    description: Holidays from historical years through 2049.
  - name: CSV and XLS Export
    description: Download holiday data as flat files in addition to API access.
  - name: Multiple API Keys
    description: Multiple keys per account for environment separation.
- type: UseCases
  data:
  - name: Ecommerce Scheduling
    description: Plan promotions, shipping cutoffs, and customer service hours around local holidays.
  - name: HR and Payroll
    description: Populate localized leave calendars and statutory holiday pay.
  - name: Travel Planning
    description: Surface holiday windows that affect bookings, demand, and pricing.
  - name: Workforce Scheduling
    description: Plan global team staffing around local public holidays.
  - name: Calendar Sync
    description: Hydrate enterprise calendars (Google, Outlook) with localized holidays.
  - name: Financial Markets
    description: Identify country-specific trading and settlement closures.
- type: Integrations
  data:
  - name: Google Calendar
    description: Imported holiday data into Google Calendar via custom calendars.
  - name: Microsoft Outlook
    description: Hydrate Outlook calendars with localized holiday events.
  - name: Home Assistant
    description: Community Home Assistant sensor uses Calendarific as a data source.
  - name: ETL Pipelines
    description: Community ETL examples using Python, SQLite, and Apache Airflow.
- type: Solutions
  data:
  - name: Developer API
    description: REST API for embedding holiday data into apps and services.
  - name: Data Downloads
    description: CSV and XLS bulk exports for analytics and offline use.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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