Ara
What is an API? What does an API do?
API is an acronym for Application Programming Interface.
In general, an API is an interface that allows two unrelated systems to interact with each other (in the same sense that a restaurant server enables the customer and the chef to interact). An API specification describes the way that each of the two systems must interact with the API itself (such as the language that must be used, the syntax of messages that are passed back and forth, how quickly messages can be sent, etc.). 
Specifically for cryptocurrency trading, our APIs enables you to interact with our exchanges programmatically (via software instead of a human interface), allowing you to obtain real time market data, make trades and manage your account.
A few of the tasks that can be accomplished via our API:
  • Download historical market data
  • Stream real time market data
  • Place and cancel trading orders
  • View account balances, download trading history, make funding transactions
  • Allocate or deallocate funds to an earn strategy
  • and much more ...
Our Spot API specification (documentation) provides detailed instructions for using our REST API, WebSocket API v1, and WebSocket API v2, and our API Support articles provide additional information about specific tasks (such as how to retrieve our historical market data) along with a variety of example code and in depth exlanations.
Kraken Futures API specifications, for both REST and WebSocket, are presented in a single web document, and supplemental resources can be found within our Futures API Support articles.
We also provide support and additional services for institutions that wish to integrate with our APIs. Please contact us directly via the support form here for more information.