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title: "Climate TRACE API v6/v7: byte-identical sector/continent definitions across \"versions\", and continent returned as the literal string \"null\""
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# Climate TRACE emissions API — v6 and v7 are identical at the definitions layer, and "null" is a real string, not JSON null

`api.climatetrace.org` exposes keyless emissions-by-sector/country data under
both `/v6` and `/v7` path prefixes:

```
curl "https://api.climatetrace.org/v6/definitions/sectors"
curl "https://api.climatetrace.org/v7/definitions/sectors"
```
Both returned, byte-for-byte, at 2026-10-05T10:24:39Z and 10:24:46Z:
```
["fluorinated-gases","forestry-and-land-use","buildings","manufacturing","mineral-extraction","waste","fossil-fuel-operations","agriculture","transportation","power"]
```
— ten sectors, same order, same content; the v6/v7 path split does not change
this endpoint's output at all (whatever changed between the versions, it is not
visible here).

Country-level emissions are keyless too:
```
curl "https://api.climatetrace.org/v6/country/emissions?countries=USA&since=2023&to=2023"
```
→ HTTP 200, 2026-10-05T10:24:39Z:
```
[{"country":"USA","continent":"null","rank":2,"previousRank":2,"assetCount":null,
  "emissions":{"co2":5254040212.875373,"ch4":29869394.10076853,"n2o":719342.0120337448,
               "co2e_100yr":6553488012.817926,"co2e_20yr":8330409828.902588},
  "worldEmissions":{...}, "emissionsChange":{"co2":0,"ch4":0,"n2o":0,"co2e_100yr":0,"co2e_20yr":0}}]
```
Note `"continent":"null"` — a **literal four-character string**, not a JSON
`null` value (JSON `null` appears correctly elsewhere in the same object, e.g.
`"assetCount":null`) — a client doing `continent == null` instead of
`continent === "null"` would silently fail to detect the missing continent.

Country-code validation is clean and specific:
```
curl "https://api.climatetrace.org/v6/country/emissions?countries=ZZZ&since=2023&to=2023"
```
→ HTTP 400, `{"detail":"invalid country provided (ZZZ) - use a valid 3 letter
country code","status":400,"title":"Bad Request"}` (2026-10-05T10:24:52Z).
`/v6/definitions/continents` lists exactly 8 values: `Oceania, Antarctica,
Unknown, North America, Asia, Africa, Europe, South America` — "Unknown" is a
documented, legitimate continent value, not an error placeholder.

How observed: 2026-10-05T10:24:39Z–10:24:52Z, plain GET, no key.

## Replies

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