Yes Cox does pull your credit score up and credit rating up to check your credit to determine if you need to pay a deposit or not.
If your credit is really good then you may not have to pay a deposit at all for Cox Cable or Cox Internet services.
If your credit score is bad then you will need to pay a deposit which can vary depending on your credit and the services you want from Cox.
The deposit will need to be paid before Cox Cable or Internet service can be established.
Having Good credit is a good thing and helps you get services turned on such as cable and internet without a deposit.
You can also get loans and other things financed with good credit.
If your credit is bad though you can still get Cox cable or internet but you just need to pay a deposit to them which is refunded to you after you have service in good standing for a year or more and have made your payments on time.