Mock sample for your project: bng2latlong API

Mtaa A simple REST API to access Tanzania's location information,With mtaa API you can easily query and integrate all the location in tanzania from region level to streets from your programming language of your your choice

Since 2006, Gisgraphy is a free, open source framework that offers the possibility to do geolocalisation and geocoding via Java APIs or REST webservices. Because geocoding is nothing without data, it provides an easy to use importer that will automatically download and import the necessary (free) data to your local database (OpenStreetMap, Geonames and Quattroshapes: more than 100 million entries). You can also add your own data with the Web interface or the importer connectors provided. Gisgraphy is production ready, and has been designed to be scalable(load balanced), performant and used in other languages than just java : results can be output in XML, JSON, PHP, Python, Ruby, YAML, GeoRSS, and Atom. One of the most popular GPS tracking System (OpenGTS) also includes a Gisgraphy client...Gisgraphy is a framework. As a result it's flexible and powerful enough to be used in a lot of different use cases. read more
if you use the premium servers, you can use the api key to test the webservices

The TrapStreet API finds trap streets in Google Maps, Bing Maps and OpenStreetMap data.

The Maps API web services suite offers the following APIs:
Raster
The Maps Raster API renders map data that is divided into gridded sections called tiles. Tiles are square images (png or jpg format) in various sizes which are available at 19 different zoom levels, ranging from 0 to 20. For zoom level 0, the entire earth is displayed on one single tile, while at zoom level 20, the world is divided into 2 40 tiles.
Vector
Similar to Maps Raster API, the Maps Vector API serves data on different zoom level ranging from 0 to 22. For zoom level 0, the entire earth is displayed on one single tile, while at zoom level 22, the world is divided into 2 44 tiles.
The Maps Vector Service delivers geographic map data packaged in a vector representation of squared sections called vector tiles. Each tile includes pre-defined collections of map features (points, lines, road shapes, water polygons, building footprints, ect.) delivered in one of the specified vector formats. Format of the tile is formally described using protobuf schema.

Positioning API accepts requests with radio network measurements and replies with corresponding location estimate. For more details and examples, see Developer's Guide. Cellular measurements are given in terms defined in 3GPP and 3GGP2 specifications, see the corresponsing documentation at http://www.3gpp.org.
Breaking changes from v1:
JSON fields
altaccuracy, baselat, baselng, cellparams, pilotpower, pnoffset, powrx, rxlevel,
have been deprecated and replaced with
altAccuracy, baseLat, baseLng, cellParams, pilotPower, pnOffset, rss, rxLevel
respectively.
Dependent parameters combined as a subobject.
CDMA, GSM, WCDMA, TD-SCDMA and LTE local identification parameters for serving cell moved under localId property.
GSM neighbor global ID: lac and cid for neighbor cell moved under globalIdentity property.

A simple API to get the current time based on a request with a timezone.

Welcome to the Daymet Single Pixel Extraction Tool API. You can use this API to download daily surface data within the Daymet database in a csv or json format for a single point. This API allows users to query a single geographic point by latitude and longitude in decimal degrees. A routine is executed that translates the (lon, lat) coordinates into projected Daymet (x,y) Lambert Conformal Coordinates. These coordinates are used to access the Daymet database of daily interpolated surface weather variables. Daily data from the nearest 1 km x 1 km Daymet grid cell are extracted from the database.
If you would like to learn how to automate the download of multiple locations for the Daymet Single Pixel Extraction Tool, click here.

API for OpenAQ LCS

Weather Forecast and Historical Weather Observation Data via an convenient, restful API.

Abstract IP geolocation API allows developers to retrieve the region, country and city behind any IP worldwide. The API covers the geolocation of IPv4 and IPv6 addresses in 180+ countries worldwide. Extra information can be retrieved like the currency, flag or language associated to an IP.

Open API spec for Ideal Postcodes API (api.ideal-postcodes.co.uk)