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.

Responses

🟢200

application/json

Catalog listing with release metadata, country coverage, region list, and variable dictionary.

Bodyapplication/json

Example

{
    "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": "string",
                "region": "string",
                "region_slug": "string",
                "first_year": 0,
                "last_year": 0
            }
        ],
        "country_count": 169,
        "regions": [
            {
                "slug": "western-europe",
                "name": "Western Europe"
            }
        ],
        "region_count": 8,
        "variables": [
            {
                "id": "gdppc",
                "label": "string",
                "unit": "2011 international dollars (PPP)",
                "description": "string"
            }
        ],
        "year_range": {
            "min": 0,
            "max": 0
        }
    },
    "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": "string",
        "fallback_used": true,
        "fallback_chain": [
            "string"
        ],
        "cached": true
    }
}

🟠401

🟠429

🔴503

Maddison Project Database catalog - countries, regions, release metadata

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