How Enforceable are Abortion Contracts Between Couples ?

The Gospel Coalition hits the icky horrid topic of abortion contracts since they have been in the news lately. See  What You Should Know About 'Abortion Contracts'

There are couple areas where I think in all 50 States an abortion contract would be enforceable as to perhaps some specifics. For instance its hard for to imagine that a man could by contract not have to pay child support etc if a child is born .

An interesting question is what if the woman has an abortion and the guy does not " pay up " . I am not sure about all 50 states but in States that have aggressive anti abortion laws on the book I think the public policy argument would void that contractual obligation.