Quote from RedSun:
This is for pros, and I've not seen any retail shops that offer them. Huge order no problem, someone will do with you.
If you buy CLH0 TAS (any time of the day), say at flat price. If the contract settles that day at $75, that is the price you'll pay to long the contract.
For hedgers, some producer can sell to Goldman 1,000 lots of oil at tomorrow's settlement price. Goldman can just sell the CL TAS tomorrow and takes no market risk at all.
There are many other things you can do. Use your imaginations.