Countries, cities, timezones, holidays, currencies, airports, climate — unified in a single, interconnected API. Query relationships that would take 6 separate APIs to assemble.
No credit card required · 60 free requests/day
Need to know what timezone an airport is in? That's two API calls to different providers. Currency for a country? Another API. Holidays? Another. Climate data? You get the picture.
Each API has different auth, different response formats, different rate limits, different billing. Your engineers spend hours on integration plumbing instead of building features.
World Data API unifies everything. One API key. One consistent response format. One bill. Cross-referenced data that lets you traverse relationships in a single query.
Structured, interconnected data that would take multiple API calls elsewhere. Try a few examples live—no signup required.
https://worlddataapi.com/v1/countries/DEStandards-based identifiers, bidirectional relationships, and temporal calculations — all in one coherent data model.
ISO 3166 countries and subdivisions with neighbors, capitals, and metadata.
249 countries · 5,053 regions
Major population centers with coordinates, timezone, and administrative context.
12,103 cities · 50K+ population
Airlines and airports with IATA/ICAO codes, coordinates, and timezone links.
9,062 airports · 833 airlines
IANA timezone database with UTC offsets and country/region mapping.
316 timezones · Full IANA
Calculated for any year. National and regional. Handles Easter, Eid, lunar dates.
908 holiday types · Any year
ISO 4217 codes with symbols, decimal places, and country relationships.
154 currencies
ISO 639 languages with BCP 47 tags, scripts, and text direction.
185 languages · 31 scripts
36 seasonal data points per region. Temperature, precipitation, humidity.
Historical averages · Per region
See how teams use World Data API to solve real problems.
Accurate delivery estimates that account for holidays and weekends.
Business day calculations for settlement dates and market holidays.
Airports, timezones, and local holidays in one query.
Timezone-aware scheduling with regional holiday awareness.
Country-specific holidays for accurate PTO and payroll calculations.
Sunrise, sunset, and golden hour data for any location.
Thinking about switching from another API? Here's how World Data API stacks up.
Same country data, plus 5,053 regions and 12,103 cities.
Holidays plus countries, timezones, and business day calculations.
Full IANA database with city and country relationships.
One unified API instead of juggling multiple providers.
908 holiday types with business day math built in.
316 timezones linked to countries, regions, and cities.
One subscription covers all data types. No per-endpoint billing surprises.
For evaluation and hobby projects
For production applications
Overage: $2 per 1,000 requests
Get StartedFor growing applications
Overage: $1 per 1,000 requests
Get StartedFor high-volume applications
Overage: $0.50 per 1,000 requests
Get StartedComprehensive guides and API reference for all endpoints.
Get your API key and make your first request.
Complete endpoint documentation with request and response examples.
Learn how to authenticate your requests with API keys.
Understand how countries, cities, timezones, and more connect together.
Handle errors gracefully with our comprehensive error reference.
Yes. 60 requests/day, no credit card required. Enough to build and test before you commit.
Get an API key, make a request. If you've ever made an HTTP request before, you'll be up and running in less than a minute.
Authoritative sources — ISO standards, IANA, official government calendars. We aggregate, normalize, and link it all together.
You could. But you'd spend weeks or months normalizing, merging, and maintaining them. We've already done that work.
Yes, absolutely. Once requests hit our servers and you've authenticated for the first time, typical processing time is actually closer to 5ms. Total response latency then depends mostly on your connection to our servers.
Free tier. No credit card. First request in minutes.