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Historical Data. The majority of financial data vendors can access data during trading sessions but with the requirement that any inquiry be in reference to historical market analysis. Analysis of historical market data provides a larger snapshot of the market at the expense of timely information (time inbetween database updates). Notable feedsReal time stock market data in JSON [closed] Ask Question Asked 3 years, 10 months ago. ... You do need an API key, which can be obtained for free on their website.