The Restatement allows, under some circumstances, the enforcement of past-consideration contracts. It provides as follows in Section 86, “Promise for Benefit Received”:
A promise made in recognition of a benefit previously received by the promisor from the promisee is binding to the extent necessary to prevent injustice.
A promise is not binding under Subsection (1)
if the promisee conferred the benefit as a gift or for other reasons the promisor has not been unjustly enriched; or
to the extent that its value is disproportionate to the benefit.