Mock sample for your project: OpenAQ API

The GeoDB API focuses on getting global city and region data. Easily obtain country, region, and city data for use
in your apps!
Filter cities by name prefix, country, location, time-zone, and even minimum population.
Sort cities by name, country code, elevation, and population - or any combination of these.
Get all country regions. Get all cities in a given region.
Display results in multiple languages. RESTful API adheres to industry best-practices, including
HATEOAS-style links to facilitate paging results.
Backed by cloud-based load-balanced infrastructure for resiliency and performance!
Data is periodically refreshed from GeoNames and WikiData.
Notes:
Since the database is periodically updated, this may very rarely result in certain cities
being marked deleted (e.g., duplicates removed). By default, endpoints returning city data will exclude
cities marked deleted. However, in the unlikely event that this occurs while your app is paging through a set
of affected results - and you care about the paged results suddenly changing underneath - specify
includeDeleted=SINCEYESTERDAY (or SINCELAST_WEEK if you're really paranoid!).
Useful Resources
SDKs
Angular,
Sample App
Java
JavaScript
Swagger Docs
Usage License

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

GeoDataSource™ Web Service is a REST API enable user to lookup for a city by using latitude and longitude coordinate. It will return the result in either JSON or XML containing the information of country, region, city, latitude and longitude. Visit https://www.geodatasource.com/web-service for further information.

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.

The Miataru API is very simple and straight forward. Generally you're posting (HTTP POST) a JSON formatted request to a service method locations and you get back a JSON formatted answer. Please take into consideration that this has the request-for-comment status and that it can change while there's work done on client and server applications. Versioning therefore is done by prepending the version number - /v1/ for version 1 - to the method call.

IP2Location web service providing a service to do a reverse lookup of an IP address to an ISO3166 country code, region or state, city, latitude and longitude, ZIP/Postal code, time zone, Internet Service Provider (ISP) or company name, domain name, net speed, area code, weather station code, weather station name, mobile country code (MCC), mobile network code (MNC) and carrier brand, elevation, usage type, address type and IAB category. There are also 7 categories of additional add-on response fields supported such as metro, olson time zone, translations and more. Refer to https://www.ip2location.com/web-service/ip2location for further information.

Convert an OSGB36 easting and northing (British National Grid) to WGS84 latitude and longitude.

NOTE: This is a preview of the API and it is not considered stable since refinements are still being made.
Introduction
Welcome to the Truora Check RESTful API reference. You may also want to check out our Validations API docs or our Signals API docs.
Truora Check API allows performing full background checks on people, vehicles and companies. There are three main types of background checks:
Personal background check: Verifies national IDs in multiple databases of public and legal entities in the LATAM region. For every national ID, returns information on: personal identity, criminal records, international background check, and professional background.
Vehicle background check: Verifies the vehicle documents and the owner identity in multiple databases of public and legal entities in the LATAM region. For every vehicle and owner type, returns information on: personal identity, driving records, criminal records, and vehicle information.
Company background check: Verifies the tax ID or a company name in multiple databases of public and legal entities in the LATAM region. For every company, returns the associated: business status, legal and criminal records, and media reports.
API Key V1 is live!
API key version 1 is now live. Users with version 0 API keys are not immediately required to upgrade to V1 but should plan to do so at their earliest convenience. The changes for integration with API keys v1 are as follows:
The field `user_authorized` is now required to perform person checks. This field indicates the API user has authorization to perform the check in compliance with data protection law.
The field `homonym_scores` is no longer included in our person check response as its results are already included in the body of the check and keeping them duplicated is generating unnecessary confusion.
API composition
Endpoints
Check endpoints: Provide an easy way to create and search for a background check. They also allow inserting groups of checks into reports. Each check contains scores, datasets and databases.
SDKs
If your favorite language was not on the next list, You can use our OpenAPI 3 spec to generate it using the Open API Generator.
To download the SDK click on the desired programming language:
C# .Net Core
Elixir
Go
Java
JavaScript
Objc
Php
Python
Ruby
You can see the full list of supported platforms here:
https://openapi-generator.tech/docs/generators

Use this JSON API to build and test radio links for any radio, anywhere. Authenticate with your API2.0 key in the request header as key

IP2Proxy allows instant detection of anonymous proxy, VPN, TOR exit nodes, search engine robots (SES), data center ranges (PX2-PX10), residential proxies (PX10) and VPN provider name (PX11) by IP address. It also returns the threat type of the proxy (PX9 or higher). Visit https://www.ip2location.com/web-service/ip2proxy for further information.

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