Research

Single-variable Penn World Table time series for one country

Returns a lean (year, value) series for one Penn World Table variable for one ISO 3166-1 alpha-3 coded country. Useful for charting a single metric over time without pulling the full 47-column panel. The variable name must match a Penn World Table column exactly. Popular picks: rgdpo (output-side real GDP), rgdpe (expenditure side), cn (capital stock), hc (human capital index), ctfp (TFP level), labsh (labor share of income). Call /api/v1/research/pwt/definitions for the complete variable dictionary. Published under CC BY 4.0 with attribution to Penn World Table (Feenstra, Inklaar & Timmer, University of Groningen).

get/api/v1/research/pwt/country/{iso3}/{variable}

Path parameters

iso3string required

ISO 3166-1 alpha-3 country code. Case-insensitive; normalised to uppercase.

variablestring required

Penn World Table variable name (e.g. rgdpo, cn, hc, ctfp, labsh).

Query parameters

start_yearinteger nullable

Inclusive start year (integer). Panel range starts 1950.

end_yearinteger nullable

Inclusive end year (integer). Defaults to the latest year in the panel.

versionstring nullable

Release selector. pwt1100 (default) or pwt1001 (legacy).

Response

Year-value pairs for one variable plus variable description and type.

Example response

{
  "data": {
    "version": "pwt1100",
    "countrycode": "USA",
    "country": "United States",
    "variable": "rgdpo",
    "type": "real-gdp-ppp",
    "observations": [
      {
        "year": 2020,
        "value": 20953.03
      }
    ],
    "count": 74,
    "start_year": 1950,
    "end_year": 2023
  },
  "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": 8.532,
    "source": "sugra_crypto",
    "attribution": "Short interest and Reg SHO daily short volume data is owned by and sourced from FINRA (Financial Industry Regulatory Authority).",
    "fallback_chain": [
      "sugra_crypto",
      "sugra_finance"
    ],
    "period": "2026-Q1",
    "notes": "the UKMTO report behind these counts is dated 2026-08-21 and is 11 days old"
  }
}

Changes

Changed in 2 of the 23 revisions of this API.15

Sep 1, 2026328d061c12ca3See the full diff
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  added the optional property meta/data_age_days to the response with the 200 status
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  added the optional property meta/notes to the response with the 200 status
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  added the optional property meta/period to the response with the 200 status
  response-optional-property-added
Aug 8, 20264c4530760ba112See the full diff
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  added the optional property code to the response with the 401 status
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  added the optional property code to the response with the 429 status
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  added the optional property code to the response with the 503 status
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  added the optional property hint to the response with the 401 status
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  added the optional property hint to the response with the 429 status
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  added the optional property hint to the response with the 503 status
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  added the optional property plan to the response with the 401 status
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  added the optional property plan to the response with the 429 status
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  added the optional property plan to the response with the 503 status
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  added the optional property reason to the response with the 401 status
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- ○
  added the optional property reason to the response with the 429 status
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  added the optional property reason to the response with the 503 status
  response-optional-property-added

Full history