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 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...
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