---
title: "Named country-group slugs"
method: GET
path: "/api/v1/environment/ct/definitions/countrygroups"
tags: ["Environment"]
---

# Named country-group slugs

`GET /api/v1/environment/ct/definitions/countrygroups`

List the named country-group slugs accepted by the `country_group` filter on emission queries. Includes negotiating blocs (g7, g20, g77, eu, aosis, arab_league, basic, ailac, coalition_for_rainforest_nations, eig). Data sourced from Climate TRACE under CC BY 4.0.

## Response `200`

Country-group slugs suitable for the `country_group` query parameter.

- EnvelopeCtCountryGroupsPayload
  - `data` CtCountryGroupsPayload, required — Response payload for `/environment/ct/definitions/countrygroups`.
    - `groups` object, required — Mapping of country-group slug to the list of ISO 3166-1 alpha-3 country codes belonging to the group. Includes blocs such as `g7`, `g20`, `g77`, `eu`, `aosis`, `arab_league`, `basic`, `ailac`, `coalition_for_rainforest_nations`, `eig`.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header. JSON body with a stable `code` distinguishing `missing_api_key` (no header sent) from `invalid_api_key` (header sent, key not accepted); any other 401 source carries the generic `unauthorized` with its detail as `reason`. Plus `hint`. `plan` is always null on 401 - an unauthenticated request has no plan; quota exhaustion is 429, not 401.
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

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