API & MCP

Everything a person can do on Cartograph Country Facts (capital, population, area, languages, neighbours), a program or AI agent can do with the same inputs and get the identical result.

HTTP API

• POST https://cartographcountryfacts.usefulweb.site/api/v1/calculate – run Cartograph Country Facts (capital, population, area, languages, neighbours)
• GET https://cartographcountryfacts.usefulweb.site/api/v1/tool – inputs, output schema, examples
• OpenAPI 3.1: /openapi.json · /openapi.yaml
• Errors: application/problem+json; 422 includes per-field errors.

Cartograph Country Facts (capital, population, area, languages, neighbours)

Shows a fact card for one of 197 countries — capital, population with its estimate year, area, population density, rank in the world, official languages, land neighbours, the flag and its description — with a map of the country and its neighbours, and optionally compares it with a second country. Facts come from the final edition of The World Factbook (public domain) and Wikidata. It is the facts engine of the Cartograph app.

Example request

France

curl -X POST https://cartographcountryfacts.usefulweb.site/api/v1/calculate -H 'content-type: application/json' -d '{"country":"France"}'

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

• Streamable HTTP endpoint: https://cartographcountryfacts.usefulweb.site/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
• Tools: cartograph_country_facts
• Local stdio connector: node src/mcp-stdio.ts --tool=cartograph-country-facts

{
  "mcpServers": {
    "cartograph-country-facts": { "type": "http", "url": "https://cartographcountryfacts.usefulweb.site/mcp" }
  }
}