Standard Data APIs.
Reference data APIs serve the lists everyone copies into a constants file and never updates — countries, currencies, languages, timezones, ISO codes. Query them instead of shipping a stale table that breaks the day a code changes.
Also called reference data APIs, lookup APIs or ISO code APIs50 services in this categoryStandard Data APIs
50 servicesGenerate iCal API
Generate downloadable .ics files or signed links from event details, with reminders, recurrence, all-day events, and time zone support.
ApyHubVerifiedHosted on ApyHubConvert Currency to Multiple Currencies API
Convert a source currency into multiple target currencies with optional date-based rates. Returns pair keys with rates or false when unavailable.
ApyHubVerifiedHosted on ApyHubConvert Timezone and Meeting Planner API
Convert local datetimes across IANA time zones with DST-aware offsets, or plan meetings across multiple zones. Returns structured source, UTC, and target times.
Business Days Calculator API.
Calculate business-day adds, counts, checks, and holiday lists with country calendars for US, GB, CA, AU, DE, FR, and IN.
Advanced Schedule Cron API
Compute upcoming fire times for a 5-field cron expression. Return next_runs, count, timezone, and the reference time in UTC.
Language Dictionary API
Get ISO 639-1 languages with code, English name, and native name. Useful for language pickers, localisation, and code-to-name lookups.
ApyHubVerifiedHosted on ApyHubPublic Holidays API
Get public holidays by country and year, plus the supported country list. Use it for business-day logic, scheduling, and holiday calendars.
ApyHubVerifiedHosted on ApyHubWorking Day Calculator API
Count working days between two dates for a country. Returns total days, weekends, holidays, and working_days for scheduling and payroll logic.
ApyHubVerifiedHosted on ApyHubConvert Date & Time Formats API
Convert ISO strings, unix epochs, or now into UTC, localized, and relative formats. Returns weekday, week number, and epoch values.
Search US Address API
Search address matches from a text query, with optional country filtering and result limits. Useful for autocomplete, lookup, and address validation flows.
Dosvak LLCAdvanced IBAN Validation API
Validate an IBAN from a single iban parameter and get a success/code response. Useful for payment flows and bank-detail checks.
Foreigen Exchange Rates API
Get FX rate data for a chosen base currency. Returns a success flag, numeric code, and the rate blocks used in pricing, billing, and reporting.
Which Standard Data API do you need?
The question you arrived with, and the endpoint that answers it.