Checkiday - National Holiday and Event API

aid: checkiday-national-holiday-api
name: Checkiday - National Holiday and Event API
description: |
  Industry-leading Holiday and Event API by Checkiday, providing data on more
  than 5,000 national, international, and bizarre holidays and observances with
  thousands of descriptions, hashtags, images, founders, alternate names, and
  multi-year occurrence patterns. Routed through the apilayer marketplace with
  X-API-Key (apikey) header authentication and official client libraries for
  JavaScript, TypeScript, Python, C#, PHP, Go, Dart, Rust, and Java/Kotlin.
  Trusted since 2011 by media organizations including CNN, The New York Times,
  and USA Today.
url: https://apilayer.com/marketplace/checkiday-api
specificationVersion: '0.20'
created: '2026-05-28'
modified: '2026-05-30'
x-source: public-apis/public-apis
x-category: Calendar
x-type: company
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
tags:
  - Calendar
  - Holidays
  - Events
  - Observances
  - Dates
  - Time
  - Public APIs
apis:
  - aid: checkiday-national-holiday-api:checkiday-holiday-api
    name: Checkiday Holiday and Event API
    description: |
      REST API delivering daily holiday and observance data. Provides three
      operations — list events for a date (`/events`), look up event details
      by id (`/event`), and full-text search across events (`/search`).
      Authenticated via the `apikey` header and routed through
      `api.apilayer.com/checkiday`. Monthly rate limits are returned with
      every response via `x-ratelimit-limit-month` and
      `x-ratelimit-remaining-month` headers.
    humanURL: https://apilayer.com/marketplace/checkiday-api
    baseURL: https://api.apilayer.com/checkiday
    tags:
      - Calendar
      - Holidays
      - Events
    properties:
      - type: Documentation
        url: https://apilayer.com/marketplace/checkiday-api
      - type: APIReference
        url: https://apilayer.com/marketplace/checkiday-api
      - type: OpenAPI
        url: openapi/checkiday-openapi.yml
      - type: Authentication
        url: https://apilayer.com/marketplace/checkiday-api
      - type: SignUp
        url: https://apilayer.com/marketplace/checkiday-api#pricing
      - type: Pricing
        url: https://apilayer.com/marketplace/checkiday-api#pricing
      - type: RateLimits
        url: rate-limits/checkiday-rate-limits.yml
      - type: Plans
        url: plans/checkiday-plans-pricing.yml
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-js
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-python
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-csharp
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-php
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-go
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-dart
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-rust
      - type: SDK
        url: https://github.com/westy92/holiday-event-api-java
      - type: JSONSchema
        url: json-schema/checkiday-event-summary-schema.json
      - type: JSONSchema
        url: json-schema/checkiday-event-detail-schema.json
      - type: JSONSchema
        url: json-schema/checkiday-get-events-response-schema.json
      - type: JSONSchema
        url: json-schema/checkiday-get-event-info-response-schema.json
      - type: JSONSchema
        url: json-schema/checkiday-search-response-schema.json
      - type: JSONStructure
        url: json-structure/checkiday-event-summary-structure.json
      - type: JSONStructure
        url: json-structure/checkiday-event-detail-structure.json
      - type: CodeExamples
        url: examples/checkiday-get-events-example.json
      - type: CodeExamples
        url: examples/checkiday-get-event-info-example.json
      - type: CodeExamples
        url: examples/checkiday-search-example.json
common:
  - type: Website
    url: https://apilayer.com/marketplace/checkiday-api
  - type: Portal
    url: https://apilayer.com/
  - type: Marketplace
    url: https://apilayer.com/marketplace
  - type: SignUp
    url: https://apilayer.com/marketplace/checkiday-api#pricing
  - type: Login
    url: https://apilayer.com/auth/login
  - type: Pricing
    url: https://apilayer.com/marketplace/checkiday-api#pricing
  - type: TermsOfService
    url: https://apilayer.com/terms
  - type: PrivacyPolicy
    url: https://apilayer.com/privacy-policy
  - type: Support
    url: https://apilayer.com/contact
  - type: Contact
    url: https://apilayer.com/contact
  - type: StatusPage
    url: https://status.apilayer.com/
  - type: Blog
    url: https://blog.apilayer.com/
  - type: GitHubOrganization
    url: https://github.com/westy92
  - type: GitHubRepository
    url: https://github.com/westy92/holiday-event-api-js
  - type: PublicAPIsListing
    url: https://github.com/public-apis/public-apis
  - type: JSONLD
    url: json-ld/checkiday-national-holiday-api-context.jsonld
  - type: Resources
    name: Checkiday Vocabulary
    url: vocabulary/checkiday-national-holiday-api-vocabulary.yml
  - type: Resources
    name: Checkiday Spectral Rules
    url: rules/checkiday-rules.yml
  - type: Resources
    name: Holiday Lookup Capability
    url: capabilities/holiday-lookup.yaml
  - type: Resources
    name: Event Discovery Capability
    url: capabilities/event-discovery.yaml
  - type: Resources
    name: Editorial Calendar Capability
    url: capabilities/editorial-calendar.yaml
  - type: Resources
    name: Checkiday FinOps
    url: finops/checkiday-finops.yml
features:
  - name: 5,000+ Holidays
    description: Coverage of more than 5,000 national, international, and bizarre holidays and observances across the calendar year.
  - name: Multi-day Event Awareness
    description: Distinguishes single-day events, multi-day events that start on a date, and multi-day events still ongoing on a date.
  - name: Rich Event Detail
    description: Each event exposes descriptions in plain text, HTML, and Markdown, plus alternate names, founders, hashtags, sources, and how-to-observe text.
  - name: Image Assets
    description: Small, medium, and large image variants for each event suitable for editorial and social-media use.
  - name: Occurrence Patterns
    description: Historical and forward-looking occurrence dates with configurable start and end year ranges, plus per-pattern length and observance rules.
  - name: Full-text Event Search
    description: Search across all events by name or description with adult-content filtering.
  - name: Timezone-aware Date Lookups
    description: IANA timezone parameter ensures the "today" date is calculated correctly across regions and DST boundaries.
  - name: Adult Content Filtering
    description: >-
      Optional `adult` flag toggles inclusion of events that may be unsafe for viewing at work or by
      children.
  - name: Per-response Rate-limit Visibility
    description: Every response echoes the monthly quota and remaining requests as JSON fields and HTTP headers.
  - name: Eight Official Client SDKs
    description: First-party libraries for JavaScript, TypeScript, Python, C#, PHP, Go, Dart, Rust, and Java/Kotlin published to their canonical package registries.
useCases:
  - name: Editorial Calendar Planning
    description: Newsrooms and content teams plan daily articles, social posts, and segments around recognized holidays and observances.
  - name: Social Media Automation
    description: Schedulers and bots auto-generate hashtag-aware posts celebrating each day's holidays across multiple channels.
  - name: Marketing Campaign Triggers
    description: E-commerce and retail platforms launch themed promotions tied to seasonal and bizarre holidays.
  - name: Chatbot and Assistant Enrichment
    description: Conversational AI surfaces today's events when greeting users or building daily briefings.
  - name: Email and Push Notifications
    description: Newsletter platforms include "today is..." segments using the events feed.
  - name: Restaurant and Hospitality Specials
    description: Food-themed holidays drive daily menus, specials, and POS promotions.
  - name: Education and Classroom Activities
    description: Teachers use holiday data to anchor lessons, vocabulary, and discussion topics.
integrations:
  - name: Slack
    description: Post the day's events into team channels via webhook automations.
  - name: Discord
    description: >-
      Community bots (e.g. `1upbyte/Checkiday-Discord`) report the day's holidays in servers.
  - name: Zapier
    description: Trigger workflows when specific holidays occur or are upcoming.
  - name: Make (Integromat)
    description: Compose multi-step automations that consume the events feed.
  - name: HubSpot
    description: Drive marketing-automation workflows from upcoming-holiday triggers.
  - name: Mailchimp
    description: Inject today's holidays into transactional and broadcast emails.
  - name: Buffer
    description: Schedule holiday-themed social posts in advance.
  - name: WordPress
    description: Plugins embed today's holidays in publisher sidebars and blog posts.
  - name: Shopify
    description: Holiday-aware merchandising and email triggers for storefronts.
  - name: Sopel IRC
    description: >-
      `sopel-checkiday` community plugin surfaces holidays in IRC channels.
solutions:
  - name: Free Tier
    description: 100 monthly requests with no credit card for evaluation and hobby projects.
  - name: Basic Tier
    description: 5,000 monthly requests at $9.99/month for small applications and indie publishers.
  - name: Pro Tier
    description: 50,000 monthly requests at $49.99/month for production media and marketing workloads.
  - name: Enterprise Tier
    description: 250,000 monthly requests at $99.99/month for high-volume publishers and platforms.
  - name: Custom Volume
    description: Negotiated pricing above 250k requests for enterprises and aggregators.
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com