atlasfetch-mcp

No signup needed to try it: without a key it falls back to a shared public demo key, capped at 1,000 lookups a month across everyone using it. Get your own limits with a free sign-up at atlasfetch.xyz.

An MCP server for AtlasFetch — reverse geocoding to administrative boundaries and streets, and geofencing, as tools your AI assistant can call directly.

Ask "which municipality is -33.9249, 18.4241 in?" and get Cape Town, Western Cape, South Africa with ISO 3166 codes — from a real point-in-polygon lookup, not the model's memory.

country: United Kingdom (GB) · region: England (GB-ENG) · municipal: City of Westminster (GB-WSM)

What it does

| Tool | What it does | | --- | --- | | lookup_location | A coordinate becomes the country, region and municipality containing it, with ISO 3166-1 / 3166-2 codes, plus matches from your own boundary sets. Optionally the nearest street (ask for the street layer), and the point as an H3 cell or Google Plus Code. | | list_boundary_sets | Lists your boundary sets, their counts, and which API keys may query them. | | create_boundary_set | Creates an empty set for your own polygons. | | add_boundary | Adds one GeoJSON polygon, with properties returned on every match. |

Good for: reverse geocoding to administrative areas, finding the street a point is on, geofencing against your own delivery zones or service areas, jurisdiction and region checks, tagging location data with region codes.

Not for: forward geocoding or place search (an address to a coordinate), routing, distances, map tiles, or downloading boundary geometry.

Streets

Add the street layer and the answer includes the nearest street, and the house number where one is mapped. It is worldwide, and opt-in — not part of the default country, region, municipal.

You always get three answers — for 5 m, 20 m and unlimited — because "the nearest street" depends on how far you are willing to look:

"street": [
  { "radiusMeters": 5,    "streetNumber": null, "streetName": "Adderley Street", "postcode": null,   "distanceMeters": 2.7 },
  { "radiusMeters": 20,   "streetNumber": "25", "streetName": "Adderley Street", "postcode": "8001", "distanceMeters": 9.6 },
  { "radiusMeters": null, "streetNumber": "25", "streetName": "Adderley Street", "postcode": "8001", "distanceMeters": 9.6 }
]

Two nulls that mean different things: "street": null means there is no street data for that country, while an entry whose fields are null means nothing was within that radius. streetNumber and postcode are strings (44A, 12-14, 0181); house numbers are rare outside well-mapped areas; no street geometry is returned.

Install

Claude Code

claude mcp add atlasfetch -- npx -y atlasfetch-mcp

Claude Desktop, Cursor, VS Code and other clients

Add to your MCP config (claude_desktop_config.json, .cursor/mcp.json, or your client's equivalent):

{
  "mcpServers": {
    "atlasfetch": {
      "command": "npx",
      "args": ["-y", "atlasfetch-mcp"],
      "env": {
        "ATLASFETCH_API_KEY": "your-key-here"
      }
    }
  }
}

Requires Node 20 or newer.

Getting a key

The demo key is shared by every anonymous user on the internet — one pooled quota and rate limit. Fine for a first look, wrong for anything real.

Create your own at atlasfetch.xyz/dashboard and set ATLASFETCH_API_KEY. The free Personal plan needs no card.

| Variable | Default | Purpose | | --- | --- | --- | | ATLASFETCH_API_KEY | (demo key) | Your API key. | | ATLASFETCH_API_URL | https://api.atlasfetch.xyz | Override only for local or staging APIs. |

Two things that surprise people

municipal is the finest unit available, not a consistent kind of thing. Los Angeles returns a city; rural Kansas returns a county; some places return a district. Where a country's fine tier is patchy, a coarser complete tier answers instead, because a county beats null for most uses. Don't assume the value names a city.

A new boundary set cannot be made queryable from here. Sets are created switched off and granted to no key, and granting is addressed by API key id — which only a signed-in browser session can list. So this server can create a set and fill it, but the last step happens in the dashboard. create_boundary_set says so in its response rather than leaving you with a set that silently matches nothing.

Billing

One call is one lookup, however many layers, sets or grid codes it touches. Metering happens before matching, so a lookup that matches nothing still counts. Requests rejected as invalid or rate-limited are not billed.

Development

npm install
npm run build
node scripts/smoke.mjs   # drives the built server with a real MCP client, against the live API

Links

• Documentation · OpenAPI spec · llms.txt
• Playground — try a lookup with no signup

Licence

MIT for this server. Reference boundaries derive from OpenStreetMap under the ODbL; attribution and share-alike obligations pass through to you. Coordinates you look up are not stored.