Quandl is a data platform that hosts financial and economic data from hundreds of publishers such as Zacks, Zillow, The World Bank, Nasdaq, and Barchart on a single website. Data analysts and researchers can access data by direct logging into the website or via using an API in standard formats that is accessible via various popular tools and products. Not only Quandl platform saves time and effort but also let users customize the format of data.
The following image gives an idea of how the Quandl platform works.
Source: QuandlThe Quandl API offers a uniform, simple, RESTful interface to all data on Quandl. The Quandl API is free to use with a permission and rate limit of 50 calls per day. Authenticated users have a limit of 2,000 calls per 10 minutes, and a limit of 50,000 calls per day. Premium data subscribers have a limit of 5,000 calls per 10 minutes, and a limit of 720,000 calls per day.