Need geospatial API with reverse geocoding and boundaries

If you need a geospatial API that supports reverse geocoding and boundaries/polygons, here are the best options depending on your needs:

Good API options

1. Google Maps Platform

• Reverse geocoding: Yes
• Boundaries: Limited; strong for administrative areas, but not ideal for custom boundary polygons
• Pros: Very accurate, global coverage, easy to use
• Cons: Can get expensive; boundary data is not as flexible as GIS-focused providers

2. Mapbox

• Reverse geocoding: Yes
• Boundaries: Yes, for some administrative boundaries and tilesets; also supports custom boundary layers
• Pros: Developer-friendly, good maps and geocoding
• Cons: Boundary datasets may require extra setup or paid data

3. HERE Geocoding & Search API

• Reverse geocoding: Yes
• Boundaries: Supports administrative boundaries and location layers
• Pros: Strong global data, good enterprise support
• Cons: More enterprise-oriented pricing and setup

4. OpenStreetMap-based services

Examples:

• Nominatim (reverse geocoding)

• Photon

• Pelias

• Reverse geocoding: Yes

• Boundaries: Possible, but depends on the setup and data you load

• Pros: Open-source, flexible, cheap/self-hostable

• Cons: More maintenance, quality varies by region

5. Geoapify

• Reverse geocoding: Yes
• Boundaries: Yes, includes administrative boundaries
• Pros: Simple API, good docs, decent pricing
• Cons: Less powerful than big enterprise providers

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If you specifically need boundaries

Look for APIs that can return:

• country/state/city boundaries
• postal code polygons
• custom geofences
• point-in-polygon queries

For this use case, Mapbox, HERE, or Geoapify are usually the most practical managed APIs.
If you need full control over boundary data, use:

• PostGIS
• OpenStreetMap + Nominatim/Pelias
• Turf.js / Shapely for spatial checks

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Recommended stacks by use case

Simple app / fast integration

• Geoapify or Mapbox

Enterprise / global accuracy

• HERE or Google Maps Platform

Cheapest / self-hosted

• Nominatim + PostGIS + OpenStreetMap data

Custom boundaries/geofencing

• PostGIS
• GeoServer
• Turf.js
• Mapbox tilesets

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Example capabilities to ask for

When comparing APIs, check whether they support:

• reverse geocoding by lat/lon
• administrative hierarchy (country, region, city, district)
• boundary polygon output
• point-in-polygon lookup
• batch reverse geocoding
• GeoJSON export
• licensing for commercial use

If you want, I can also give you:

1. a side-by-side comparison table, or
2. API recommendations based on your budget and scale.