Breeding loan policies

I'm not at the point yet, but what is the norm or standard for breeding loans? I have a female het albino ball and I'm getting a normal female, and I will want to breed them in a couple of years to an albino male. I figure just before I find a stud I would get a clean bill of health for them from a vet, and let the stud's owner hold them for copulation, but what kind of payments are standard? Maybe cash up front for the time, then 1 of the babies or a share of profits from sale of the offspring? Can you list a few different scenarios of what is commonplace?

I would think that if they used a visible albino male you would split the clutch with them getting the extra if there is one and/or first pick. If it was a het male then I would say split the clutch and sell one if odd numbered and split the cash or if the odd is a normal maybe have one party get first pick and the other party get the extra normal. Either way I think a split of the clutch would work out.