API & MCP

Everything a person can do on Cartograph, a program or AI agent can do with the same inputs and get the identical result.

HTTP API

• GET https://cartograph.usefulweb.app/api/v1/tools – catalog
• GET https://cartograph.usefulweb.app/api/v1/tools/{id} – inputs, output schema, examples
• POST https://cartograph.usefulweb.app/api/v1/tools/{id}/calculate – run a tool
• GET https://cartograph.usefulweb.app/api/v1/workflows · POST https://cartograph.usefulweb.app/api/v1/workflows/{id}/run
• OpenAPI 3.1: /openapi.json · /openapi.yaml
• Errors: application/problem+json; 422 includes per-field errors.

Tools on Cartograph

• Cartograph Map Poster (SVG + PDF from OpenStreetMap) – Turn an OpenStreetMap extract into a print-ready city map poster as SVG and vector PDF. cartograph_map_poster
• Cartograph GPS Art Route Designer (shape → roads → GPX) – Snap a heart, star or other shape to the streets of your OSM extract and get a GPX route. cartograph_route_art
• Cartograph Meet Halfway (fair meeting point for 2–12 people) – Find the fairest meeting point for 2–12 people: geodesic midpoint, minimax and least total distance. cartograph_meet_halfway
• Cartograph True Size of Countries (Mercator comparer) – Move a country to another latitude and see its true size against the Mercator map. cartograph_true_size

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://cartograph.usefulweb.app/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
• Tools: cartograph_map_poster, cartograph_route_art, cartograph_meet_halfway, cartograph_true_size
• Local stdio connector: node src/mcp-stdio.ts

{
  "mcpServers": {
    "usefulweb": { "type": "http", "url": "https://cartograph.usefulweb.app/mcp" }
  }
}