Pixabay - Free Images

Pixabay is a website where users can browse through and download high quality photos, vector graphics and art illustrations that are all license free. Pixabay hosts a RESTful API interface for querying and retrieving these CC0 public domain images from Pixabay's directory of over 260,000 photos. The API can be accessed via HTTP address, and returns in JSON unicode. The API is limited to a maximum of 300 search results per query, and requires an API key for access.

Canadian Virtual Exchange

The Canadian Virtual Exchange (CAVIRTEX) is a BitCoin and cryptocurrency exchange platform. Their public API allows developers to communicate with CAVIRTEX in order to receive real time cryptocurrency pricing and trading information. Their private API requires special API access, and allows users to implement trading, balance-checking, and more programmatically. This RESTful API uses JSON formatted requests and responses.

Office 365 Discovery Service

This service allows developers using Microsoft Office 365 APIs to browse the API endpoint directory with a simple query tool. Developers can make HTTP requests to the Discovery Service APIs in order to return information on API endpoints for further use in development. In order to access the Office 365 APIs, developers must first register their apps with Microsoft. All APIs use JSON with the Auth0 protocol for authentication, and Azure AD for authorization.

Office 365 Contacts

The Office 365 Contact API gives full access to a user's contacts and contact groups they have logged in Exchange Online. The Contact API can retrieve personal contact information such as email, address, name, phone number, and more. The API also allows developers to add a new contact or edit existing contacts. In order to access the Office 365 APIs, developers must first register their apps with Microsoft. All APIs use JSON with the Auth0 protocol for authentication, and Azure AD for authorization.

Office 365 Calendar

The Office 365 Calendar API allows full access to a user's calendar groups, calendars, and events, with associated metadata. Developers can implement the API to programmatically check for events and schedule new ones. In order to access the Office 365 APIs, developers must first register their apps with Microsoft. All APIs use JSON with the Auth0 protocol for authentication, and Azure AD for authorization.

Office 365 Mail

The Office 365 Mail API allows access to a user's full inbox and mail messages, mailbox folders, and associated metadata. Using the API, developers can read, compose, and send emails. In order to access the Office 365 APIs, developers must first register their apps with Microsoft. All APIs use JSON with the Auth0 protocol for authentication, and Azure AD for authorization.

US Poverty Data

The US Poverty Data can be used to determine where a group is located on the official poverty line in the United States. Developers can make a simple GET request to US Poverty Data using input variables such as income, social security, welfare, veterans, housing, energy, child support and more. The API will return poverty information that relates to the amount, rate, and share of impoverished people according to the input criteria. The API will also return race, sex, age, disability statistics that correspond to the input criteria as well. The API uses US government census data, and is open for any developer to integrate into a website or 3rd party app free of charge.

NetImpact

NetImpact provides real-time IP to location data sets in an easy to use format. Available data sets include: ISP, city, state, province, country, zip code, postal code, area code, latitude and longitude. Using a WYSIWYG API builder users create JSON applications for enhanced e-commerce and security, or to provide localized content.

Yahoo Gemini

The Yahoo Gemini API brings native ads and mobile search together to allow advertisers to manage their campaigns more efficiently. Working with a set of RESTful objects, developers will are able to: automate campaign management, target campaigns by factors like location or interests, and receive reports to measure effectiveness of the campaign. After receipt of an API Key developers can use the example PHP code to get started.

Deal Zippy

The Deal Zippy API offers access to data from the biggest daily deal sites in the United Kingdom. The API gives access to data from sites like Groupon, Ebay, Amazon Local, and Travel Zoo. Deal Zippy API is available in either XML or JSON format.