It depends on what symbols you are referring to. In regards to Futures, we do list the trading hours and for most contracts, have a hyperlink to the Contract Specs from the Exchange. For US indicies, we list the source and the estimated update frequency ( every 6 seconds, every 60 seconds, etc ). For stocks, we try to post a hyerplink to the Exchange so users can quickly get the relevant info they might need. Symbols Guide
Does this help or were you inquiring about some other instrument?
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