API (Application programming Interface) is a tool for developers. It helps them to building their application by using resources built by others. For instance a developer can use  Google Web Search API  to use search results within her application or use Google Maps API . Image Source The essential purpose of API to help developer harness resources available elsewhere. An API is means by which third parties can develop code that can interface with other code written by other developer. API may consists of - a set or routines, data structures, object classes, protocols that is provided by libraries or operating system services- all meant to be used in building of applications.  Examples: Doubleclick have a published Java API that allows users to interrogate the database tables to get information about their online advertising campaign  The Amazon Product Advertising API provides programmatic access to Amazon’s product selection and discovery functionality so that

New APIs PrimoPay The service provides payment processing for e-commerce and other online transactions within Australia. It works through Australian banks to verify customer accounts and availability of funds, then completes credit card processing to transfer funds to a seller. Batching functions retry transactions that fail initially due to problems with a bank's processing system. Because it remains independent of banks, sellers can change banking relationships without reconfiguring online payment functionality. API methods support payment submission using popular credit cards Visa, MasterCard, American Express, and Diners Club, among others. Methods interact with issuing banks to pre-authorize cards and verify available account balances, then obtain buyer confirmation and complete payment processing. The API also handles refunds for cancelled or returned purchases. Hatsize

This past week 7 new mashups were added to  mashup directory and 13 different APIs were used to build them. Some of the newer or less frequently seen APIs include 500px , BioID Web Services , Singly and SubDB . The most often used APIs this week are Flickr , Instagram and Twitter . And the most commonly used types of APIs were Photos (3 APIs, 5 mashups), Video (2 APIs, 2 mashups) and Tools (2 APIs, 2 mashups). For information see here

Here is a list of API for developers   New APIs DataVote DataVote is a B2B crowdsourcing platform. Their product is a CRM database that multiple companies can have access to. The companies can share customer data with the hub and receive verification about that data. This means that companies do not have to buy customer lists, but can crowdsource them with each other. DataVote provides RESTful and SOAP solutions for businesses that want to share their data via an API. The APIs exposes the customer records uploading and retrieval functionality. Lucky Sort TopicWatch Lucky Sort provides a data analysis platform. It allows developers, marketers, and other interested parties representing companies monitor trends pertaining to their business. With Lucky Sort’s Topic Watch platform, users can construct phrase sets, like keywords, to monitor trends of interest. The results are displayed graphically with the potential to be viewed on mobile devices and can be scaled. The API