The Orange Curtain 100 km race has been created for the purpose of preparing and qualifying Southern California athletes for international competion, primarily for the 2006 IAU 100 km World Cup.
USATF publishes qualification standards for the national team which represents the USA at the IAU championships.
In addition, some international competitions list 100 km times in their qualification criteria. The Spartathlon for instance lists a time of 10:30 in a 100 km race as one qualification criterion.