How much do you get paid for a real estate assignment of contract?

As is always the case in anything real estate related - all things are negotiable.

But generally speaking, the assignment of a real estate purchase contract is a relatively straightforward process. When an agent writes the real estate purchase contract where the buyers "name" would ordinarily go. The realtor instead puts in the phrase "Buyer Joe Blow, Or his assignee." This generally considered a 'straw buyer.'

As to the monetary compensation for these actions if you're acting as the faux buyer, that appeared negotiating skills.

Good Luck