Azure Maps Search vs OpenStreetMap (Nominatim and Overpass) for AI agents
Azure Maps Search is Microsoft Azure's location search service for geocoding and finding places and businesses by name or category. Free, donation-run public servers for searching OpenStreetMap data: Nominatim for geocoding and place search, Overpass for querying OSM objects.
The short answer
- Azure Maps Search: Teams already on Azure who want place search billed on their Azure account under Microsoft's enterprise terms.
- OpenStreetMap (Nominatim and Overpass): Free, openly licensed geocoding and occasional place lookups at low volume, or a base to self-host. It is not a backend for a public app at scale.
Side by side
| Azure Maps Search | OpenStreetMap (Nominatim and Overpass) | |
|---|---|---|
| Searches | Addresses, places and businesses by name or category. Search v1.0 (POI, category, nearby search) is superseded by Search 2026-01-01 but still works. | OpenStreetMap data worldwide: addresses, places and mapped POIs. |
| Returns | JSON. Search v1 POI results include name, phone, url, categories, brands and optional opening hours. | Nominatim returns xml, json, jsonv2 (the default), geojson or geocodejson. With extratags=1 it adds extra tags such as opening hours or a wikipedia link when mapped. |
| Before the first call | An Azure subscription with an Azure Maps account. Authentication is by Shared Key, Microsoft Entra ID or SAS token. | No account or key. Nominatim requires a valid User-Agent or Referer that identifies your app, and visible attribution. |
| Free | 5,000 Search transactions a month. | Free within strict limits. Nominatim allows an absolute maximum of 1 request per second. Overpass asks users to stay at or below roughly 10,000 requests and 1 GB a day. |
| Paid | $4.50 per 1,000 Search transactions (under 500K a month). Volume discounts start at 100,000 transactions. | No paid tier. Heavy users are told to run their own instance or use commercial third-party providers. |
| Acting on a result | v1 POI results include phone and website URL. There is no way to message a business through the API. | Phone or website appear only when mappers tagged them in OSM, through Nominatim's extratags. There is no messaging. |
| Limits on keeping or showing results | Results may be cached only to reduce latency, not to serve multiple users, and for no longer than the header validity or 6 months, whichever is shorter. Geocodes may be kept while the Azure account is active. Results may not be displayed on third-party maps or content. | Data is ODbL (share-alike), and you must credit OpenStreetMap and its contributors. Nominatim requires results to be cached for bulk jobs. It bans systematic queries, downloading all POIs in an area, autocomplete, and reselling results. |
| AI in its terms | The Product Terms say the customer may not modify or create a derivative work from any content using machine learning or artificial intelligence unless the terms expressly allow it. They also forbid building a competing or derived database. | Nominatim's policy has a "Usage in LLMs" section. LLMs may only suggest the service if they prominently point to the usage policy. The public API must not be built into or offered through no-code, low-code or vibe-coding platforms as a generic place-search service. |
| Coverage | Not stated on its pages | Worldwide OpenStreetMap data. POI completeness depends on volunteer mapping. |
| MCP server | No official server listed | No official server listed |
Where Openpath fits
If the agent needs a local business to message in Austin, Texas, Openpath returns the listings themselves, free and with no key. See Openpath vs Azure Maps Search and Openpath vs OpenStreetMap (Nominatim and Overpass).
Questions people ask
What do I need before I can use Azure Maps Search?
An Azure subscription with an Azure Maps account. Authentication is by Shared Key, Microsoft Entra ID or SAS token.
Is Azure Maps Search free?
5,000 Search transactions a month.
What do I need before I can use OpenStreetMap (Nominatim and Overpass)?
No account or key. Nominatim requires a valid User-Agent or Referer that identifies your app, and visible attribution.
Is OpenStreetMap (Nominatim and Overpass) free?
Free within strict limits. Nominatim allows an absolute maximum of 1 request per second. Overpass asks users to stay at or below roughly 10,000 requests and 1 GB a day.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
Azure Maps Search, read on October 15, 2026:
- azure.microsoft.com/en-us/pricing/details/azure-maps: “Meters Free <500K 500K+ ... Search 5,000 $4.50 Contact Us”
- azure.microsoft.com/en-us/pricing/details/azure-maps: “Unless otherwise specified, the prices below are per 1,000 transactions.”
- learn.microsoft.com/en-us/azure/azure-maps/rest-api-azure-maps: “search for places and businesses by name or category”
- learn.microsoft.com/en-us/azure/azure-maps/migrate-search-v1-api: “Azure Maps Search API version 1.0 has been superseded by Search API version 2026‑01‑01”
- learn.microsoft.com/en-us/azure/azure-maps/migrate-search-v1-api: “While Search v1 continues to function, new development should use the latest Search API”
- learn.microsoft.com/en-us/rest/api/maps/search/get-search-poi: “Details of the returned POI including information such as the name, phone, url address, and classifications.”
- learn.microsoft.com/en-us/azure/azure-maps/azure-maps-authentication: “Azure Maps supports three authentication methods: Shared Key, Microsoft Entra ID, and Shared Access Signature (SAS) Token.”
- microsoft.com/licensing/terms/productoffering/MicrosoftAzure/MCA: “Results may not be stored for longer than: (i) the validity period indicated in returned headers; or (ii) 6 months, whichever is shorter.”
- microsoft.com/licensing/terms/productoffering/MicrosoftAzure/MCA: “Customer may not cache or store results delivered by the Azure Maps API for the purpose of scaling such Results”
- microsoft.com/licensing/terms/productoffering/MicrosoftAzure/MCA: “Customer may not modify or create a derivative work based on any content using machine learning or artificial intelligence”
- microsoft.com/licensing/terms/productoffering/MicrosoftAzure/MCA: “Customer may not use Azure Maps or any part thereof to create a competing database or service”
OpenStreetMap (Nominatim and Overpass), read on October 15, 2026:
- operations.osmfoundation.org/policies/nominatim: “No heavy uses (an absolute maximum of 1 request per second ).”
- operations.osmfoundation.org/policies/nominatim: “Provide a valid HTTP Referer or User-Agent identifying the application”
- operations.osmfoundation.org/policies/nominatim: “LLMs may only suggest this service, if they prominently point to this usage policy and explain the restrictions of use to the user.”
- operations.osmfoundation.org/policies/nominatim: “must not be built into, offered through, suggested by, or automatically generated by no-code, low-code, or vibe-coding platforms”
- operations.osmfoundation.org/policies/nominatim: “This includes reverse queries in a grid, searching for complete lists of postcodes, towns etc. and downloading all POIs in an area.”
- operations.osmfoundation.org/policies/nominatim: “If your requirements are even larger you can install your own instance of Nominatim.”
- dev.overpass-api.de/overpass-doc/en/preface/commons.html: “users are expected to send a maximum of about 10000 requests per day and keep their download volume below about 1 GB per day”
- nominatim.org/release-docs/latest/api/Search: “the response include any additional information in the result that is available in the database, e.g. wikipedia link, opening hours”
- openstreetmap.org/copyright: “You are free to copy, distribute, transmit and adapt our data, as long as you credit OpenStreetMap and its contributors.”