MCP servers · Nominatim (OpenStreetMap search) · connector · GPT action
Connect ChatGPT to Nominatim (OpenStreetMap search)
One line gives ChatGPT your Nominatim (OpenStreetMap search) account as tools: 4 endpoints, geocode, more, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.
Three steps
- Create a free 0n3 account and connect Nominatim (OpenStreetMap search). Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into ChatGPT. Add 0n3 in ChatGPT's settings and sign in once.
- Ask ChatGPT: whoami. Then: "List customers in Nominatim (OpenStreetMap search)".
Add 0n3 to ChatGPT
- In ChatGPT, open Settings. Click Connectors (it may say Apps). Click Advanced. Turn on Developer mode.
- Click Create. For the name, type 0n3. For the MCP server URL, type https://0n3.app/mcp. For Authentication, pick OAuth.
- Sign in with your 0n3 email and password.
- Start a new chat. Turn on 0n3. Type: "whoami"
You don't need to paste a key. ChatGPT signs in to 0n3 by itself.
The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.
What ChatGPT can then do in Nominatim (OpenStreetMap search)
Geocode · Find a place by name, name the place at a coordinate, or look up OpenStreetMap ids0
Find a place by name, name the place at a coordinate, or look up OpenStreetMap ids
More · Everything else this app exposes.4
Search
GET /searchReverse
GET /reverseLookup
GET /lookupStatus
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