Does Polygon have a market holiday or status page?

Yes, we have a Market Status endpoint that returns the current trading status of the exchanges and overall financial markets. This includes whether the exchanges are in pre-market, normal trading hours, or after-hours.
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We also have a Market Holiday endpoint that returns a list of all upcoming market holidays and the specific hours and dates that they will affect the markets.
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We are also planning on adding a historical market holiday endpoint in the near future.