OpenCage

Overview

OpenCage provides forward/reverse geocoding from multiple open data sources with global coverage. Auth is an API key (an invalid key returns 401 with a detailed error body, verified).

Quick Start

Forward geocoding (replace YOUR_KEY):

curl "https://api.opencagedata.com/geocode/v1/json?key=YOUR_KEY&q=paris"

{
  "results": [
    {
      "formatted": "Paris, France",
      "geometry": { "lat": 48.8566, "lng": 2.3522 },
      "components": { "city": "Paris", "country": "France", "country_code": "fr" },
      "confidence": 10
    }
  ],
  "status": { "code": 200, "message": "OK" }
}

Reverse:

curl "https://api.opencagedata.com/geocode/v1/json?key=YOUR_KEY&q=48.8566%2C2.3522"

Authentication

• Register at opencagedata.com → free API key (in the dashboard).
• Send it as the key query parameter (invalid key → 401, verified).

Rate Limits & Notes

• Free tier: 2,500 requests/day (check current docs); paid plans scale.
• Aggregates OSM, OpenAddresses, and other open sources — with per-source attribution.
• confidence (0-10) and annotations enrich each result.
• European data is stronger than some alternatives; supports 100+ countries.

FAQ

Is OpenCage free? Free tier: 2,500 requests/day; more is paid.

How do I get a key? Register at opencagedata.com — the key is in your dashboard.

What sources does it use? OpenStreetMap, OpenAddresses, and other open data.