REST Countries

REST Countries is a data API service that helps developers and organizations access structured information about countries through a single interface. Its database covers more than 250 countries and dependencies, with over 90 fields per record, including names, ISO codes, capitals, currencies, languages, populations, political leaders, borders, flags, time zones, economic indicators, and international memberships. Data is synchronized with official sources every four hours, and the service highlights performance figures including average responses under 150 milliseconds and 99.995% uptime.

The Countries API supports full-text search and lookups by code, currency, leader, region, or organization membership. Users can select or omit fields, combine filters, and paginate results to suit their applications. REST Countries also offers a User Agent API for identifying software and devices, an IP API for geolocation and network signals, an Email Intelligence API for mail-provider and address checks, and a Currencies API for fiat and cryptocurrency exchange rates. Shared API access and documentation support integration across the services.