Holiday API
Holiday API is a commercial reference-data service that delivers verified public holidays, observances, country and language metadata, and workday calculations for 250 countries and 3,680+ state/province subdivisions in 100+ languages. Operated by Gravity Boulevard, LLC, it exposes five JSON endpoints under https://holidayapi.com/v1/ with official client libraries for Go, Node.js, PHP, Python, Ruby, and Raku.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Holiday API the way a machine reads it — 57 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Holiday API scores 50.5/100 (developing), with a separate agent-readiness read of 26/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Holiday API
Each block below is one kind of artifact we hold for Holiday API. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 4
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Holiday API Countries API
Country metadata, codes, languages, currencies, and subdivisions.
Holiday API Holidays API
Public holidays and observances for countries, states, and provinces.
Holiday API Languages API
Supported languages for retrieving localized holiday names.
Holiday API Workdays API
Working / business day calculations honoring country workweeks and holidays.
Postman Collections 4
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Holiday Countries API
POSTMANOpen Collections 5
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONHoliday Countries API
OPEN COLLECTIONHoliday Countries Holidays API
OPEN COLLECTIONHoliday Countries Languages API
OPEN COLLECTIONHoliday Countries Workdays API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Holidays Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Holidays Finops
FINOPSFeatures 9
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Verified Holiday Data
Proprietary holiday generation system continuously verifies holidays for 250 countries.
Subdivision Coverage
3,680 state and province subdivisions on the States & Provinces plan via ISO 3166-2.
100+ Languages
Localized holiday names in over 100 languages via ISO 639-1 codes.
Workday Calculator
Get workdays and count business days between dates honoring country-specific workweeks and holidays.
Historic and Future Dates
Coverage from year 1 through year 2050+ on paid plans.
Multiple Response Formats
JSON, XML, YAML, CSV, TSV, and PHP serialization.
Offline Storage
Unlimited offline caching during active paid subscription; 24-hour window on free tier.
No Velocity Throttling
All plans share a monthly request quota (1M requests/month) with no per-second or per-minute limits.
Five-Nines Uptime
Enterprise-grade infrastructure designed for 99.999% availability.
Scroll within the panel for all 9 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Holidays Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Holiday API API Rules
SPECTRALHoliday API API Rules
SPECTRALJSON Schema 5
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
JSON Structure 5
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Holidays Country Structure
JSON STRUCTUREHolidays Holiday Structure
JSON STRUCTUREHolidays Language Structure
JSON STRUCTUREHolidays Response Structure
JSON STRUCTUREHolidays Workday Structure
JSON STRUCTUREExamples 6
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Holidays Error Example
EXAMPLEHolidays Get Workday Example
EXAMPLESecurity Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 7
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Calendar and Scheduling Apps
Mark public holidays on calendar UIs and prevent scheduling on non-business days.
Business Day SLA Calculation
Compute promised-by dates that honor weekends and country-specific holidays.
HR and Payroll Systems
Determine paid time off, observed holidays, and country-specific leave eligibility.
Localized Marketing Campaigns
Time outreach to align with public holidays in target countries and languages.
E-commerce Fulfillment
Forecast shipping ETAs that respect carrier and destination-country holidays.
Financial Settlement
Adjust transaction value dates and settlement windows around bank holidays.
Global Workforce Management
Coordinate distributed teams across regions with accurate observed-holiday data.
Scroll within the panel for all 7 ·
Integrations 4
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Spreadsheets
Pull holiday data into Google Sheets / Excel via the JSON, CSV, or TSV format options.
BI Tools
Feed holiday and workday data into Looker, Tableau, or Metabase for calendar dimensions.
Workflow Automation
Trigger Zapier or n8n flows on upcoming/previous holidays per country.
Calendar Platforms
Sync verified holiday data into Google Calendar, Outlook, or iCal feeds.
Resources
Every other property we hold for Holiday API — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 4
Pagination, idempotency, versioning, errors, and events
Build 9
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 9 ·
Access & Security 1
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/holidays · machine-readable index on apis.io
This is an independent, third-party profile of Holiday API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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