Country lookup: ISO 3166 codes, currency, TLD, UN region and ISO 3166-2 subdivisions

Country lookup: find a country or territory by ISO 3166-1 alpha-2, alpha-3 or numeric code, or by name, and get the other codes, the official and common English names, the UN M49 region and sub-region, the currencies in use, the country-code TLD, and optionally the full ISO 3166-2 subdivision list with each subdivision's type. Also resolves an ISO 3166-2 subdivision code such as NL-NH directly. Names are matched case- and accent-insensitively.

Output (data): found, kind (country|subdivision), alpha_2, alpha_3, numeric, name, official_name (the ISO 3166-1 official name from Debian iso-codes, e.g. "Kingdom of the Netherlands"; the short name where ISO defines no separate official name; always a string), m49 {region, region_name, subregion, subregion_name, intermediate, intermediate_name} (UN M49 codes as zero-padded 3-character strings; subregion and intermediate are null where the hierarchy has no such level), currencies [ISO 4217 alpha-3, legal tender in use per CLDR], tld [".xx"] (the ccTLD in actual use, so GB gives .uk; empty where none is delegated), subdivision_count (always present: the number of ISO 3166-2 subdivisions), and with include=subdivisions subdivisions [{code, name, type, parent}] (ISO 3166-2 from Debian iso-codes main of 2026-09-28, source order; parent is the parent subdivision code or null; countries with none return an empty list). A code of the form CC-XXX (e.g. NL-NH) resolves a subdivision: kind is subdivision, subdivision {code, name, type, parent} is added, and the country fields describe its country. m49, currencies and tld are omitted when not named in include; subdivision_count is not. A name search adds matches [{alpha_2, alpha_3, numeric, name}] (exact name first, then substring; at most 25) plus total_matches, and the top-level fields describe the first match. ZZ and other non-ISO codes are never found.

Deterministic: identical input returns identical output, so the response is served with Cache-Control: private, max-age=31536000, immutable (the paying client may cache it indefinitely; shared caches must not, because the response is paid).

Sources: iso-codes Debian iso-codes data/iso_3166-1.json (official_name) and data/iso_3166-2.json, retrieved 2026-09-28 (published 2026-09-28, LGPL-2.1-or-later); country-codes datasets/country-codes, retrieved 2026-09-28 (published 2026-09-28, PDDL-1.0); cldr 48.2.2 (published 2026-09-28, Unicode-3.0). Echoed in meta.sources.

Price: $0.05 USDC per call (x402, Base). Route contract version 1.0.0. Docs: https://api.duoleads.com/docs#ref-country