Web API

Transactional email API service that enables you to send and track emails…

Real-time translation of your website within seconds with easy to implement,…

API news, how-to, contests and comprehensive database of API resources.

Apiary helps you build beautiful APIs with collaborative design, instant API…

Simple, multi-platform REST calls to instantly get classified abbreviations,…

An API for integrating URL shortening into your app or site.

Conversion between more than 100 different audio, video, document, ebook,…

API to create events for free and sell tickets online.

Developer APIs for Facebook integration.

Get advanced weather forecast information using an easy API.

Allows you to create apps that interact with the Foursquare service and also to…

APIs for all Google products.

API that provides you with a randomly generated user that can be used as…

Provides a single stream of real-time search data aggregated from numerous…

Tools for sharing, streaming, and customizing the Soundcloud player for your…

Adds Twitter, IM, Voice and SMS functionality to a variety of common programming…

Twitter REST APIs for integrating and other codes for embedding on websites.

APIs for interacting with Vimeo video hosting service.

APIs for integrating with Yahoo! services.