Question

South carolina eventually repealed its ordinance of nulification in exchange for

Answer 1

South Carolina repealed the ordinance of nullification in 1833. They did this in exchange for the federal government eliminating the Tariffs that had been in place since 1828 and they also wanted a gradual reduction on the import taxes that would take a decade to go into full effect.
 
federal elimination of the Tariff of 1828 and a gradual reduction on import taxes over a decade.