Local Browser API or hosted REST API?
Both are available. The Browser API runs in the user’s browser without a key. The hosted REST API is a separate versioned network service authenticated with X-API-Key.
Browser API
Client-side, private by default and suitable for static websites.
Open local documentation →API keyHosted REST API
Server-side JSON endpoints with OpenAPI schemas.
Open hosted documentation →API v1.1
Expanded deterministic endpoints are live
Conversion, DST transitions, holidays, business days, working-hours overlap, meeting fairness, best slots, batch conversion, city search and coordinate lookup now complement current time and time difference.