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There are several of sites that provide historical end of day data. - Quandl - Recommended - Kibot ( Hard to use APIs ) - Yahoo / Investing.com ( Scraping, I don't recommend ) - Polygon.io ( More focused on real-time ) Don't forget that when a dividend or split happens, this causes all the...

I wanted to post some updates about Polygon since this thread was started. We have fixed the issue of a symbol having out of sequence ticks. This was due to our distributed & concurrent systems internally. We have also launched a new WebSockets API for a more standardized protocol and easier...

Be careful of using IEX or Alphavantage ( uses IEX ). This is only 3-4% of market volume, meaning the prices are often slightly off. If that's OK for your usage, then I definitely recommend IEX. However if you're looking for 100% market coverage look for a provider of CTA + UTP feeds. Both...

For stock data there is the CTA and UTP feeds which consolidate raw tick data into a standardized stream. This may be what you're talking about?

Which worldwide stocks are you looking for? https://Polygon.io offers full US market coverage ( CTA, UTP and OTC ) feed for $199/m. I'm curious why you said "worldwide". Are you needing London or Asia markets as well? Hopefully I can help you find what you're looking for.

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