timeseries/idb/5year) for one GENC country, 1950 to 2100 by default. country is required. A to past 2100 is clamped with a note; a from past it is an empty answer. Early-year rates that the Bureau has not published are null, never filled in. An unknown two-letter code is an empty answer, not a 400.curl --location 'https://sugra.ai/api/v1/census/population/international?country=CN&from=1950&to=2100&indicators=pop%2Ctfr' \
--header 'x-api-key: ABCD314159'{
"data": {
"country": "string",
"name": "string",
"from": 0,
"to": 0,
"dataset": "string",
"indicators": [
"string"
],
"count": 0,
"data": [
{
"year": 0,
"pop": 0,
"tfr": 0,
"cbr": 0,
"cdr": 0,
"gr": 0,
"medage": 0,
"e0": 0,
"imr": 0,
"nmr": 0,
"dens": 0,
"depnd": 0,
"rni": 0,
"births": 0,
"deaths": 0,
"e0_m": 0,
"e0_f": 0,
"imr_m": 0,
"imr_f": 0,
"mpop": 0,
"fpop": 0,
"property1": "string",
"property2": "string"
}
],
"source": "string",
"reason": "string",
"note": "string",
"property1": "string",
"property2": "string"
},
"meta": {
"endpoint": "/api/v1/fred/us/cpi",
"data_time": "2026-04-16T14:30:00Z",
"response_time": "2026-04-16T14:30:12Z",
"provider": "Sugra API v1.0.1",
"data_age_days": 0,
"source": "string",
"attribution": "string",
"fallback_used": true,
"fallback_chain": [
"string"
],
"cached": true,
"stale": true,
"stale_since": "string",
"period": "string",
"notes": "string"
}
}