Kraken is a professional Bitcoin trading platform that aims to bring Bitcoin, and other crypto-currencies, into the main stream. The site offers robust trading capabilities, secure holdings, and a high level of regulatory compliance. The Kraken API uses REST calls and returns JSON. The API offers public market data, private user data and information about the user's accounts, and the ability to place and manipulate trade orders. An account is required with service.
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The Kraken PHP Sample Code by Kraken demonstrates how to interact with the API, providing authentication and currency exchange callbacks in HTTP format. In the examples, private and standard orders show how bitcoin has value over certain variables.