If I cancel subscription will I receive data through end of month?

Yes, if you cancel your subscription mid-month then you will receive market data until the last business day of the month. The monthly billing cycle starts on the first U.S. business day of the month.

If you subscribe and unsubscribe on the same day, you might not be charged if you never had that market data service before and did not make any trades.

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Are market data fees prorated?
Why was my account double charged market data fees?
When do I need to pay market data fees?
Why am I still receiving live quotes for a subscription I've canceled?