Maddison Project Database catalog - countries, regions, release metadata
Discovery endpoint for the Maddison Project Database (MPD2023). Returns publication metadata (release version, DOI, DataverseNL URL, publication date), the 169 countries in the workbook with their ISO 3166-1 alpha-3 codes and per-country first/last year of observation, the 8 analytical regions used by the Maddison Project with their stable slugs, the two variables (gdppc, pop), and the overall year range (1 AD through 2022). Use this before calling /country/{iso3}, /regional, or /top to confirm ISO3 codes and available year ranges. Published by Bolt and van Zanden at the University of Groningen under CC BY 4.0; full citation in every response envelope.
Response
Catalog listing with release metadata, country coverage, region list, and variable dictionary.
Example response
{
"data": {
"release": {
"version": "MPD2023 v1.0",
"doi": "10.34894/INZBF2",
"published": "2024-04-26T00:00:00Z",
"url": "https://dataverse.nl/dataset.xhtml?persistentId=doi:10.34894/INZBF2",
"file": "mpd2023_web.xlsx"
},
"countries": [
{
"iso3": "USA",
"country": "United States",
"region": "Western Offshoots",
"region_slug": "western-offshoots",
"first_year": 1650,
"last_year": 2022
}
],
"country_count": 169,
"regions": [
{
"slug": "western-europe",
"name": "Western Europe"
}
],
"region_count": 8,
"variables": [
{
"id": "gdppc",
"label": "GDP per capita",
"unit": "2011 international dollars (PPP)"
}
],
"year_range": {
"min": 1,
"max": 2022
}
},
"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",
"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"
]
}
}