Which of the Seven Wonders of the Ancient World contained a hemihekte in its foundation?
Phanes (coin issuer):  The celebrated coins of Phanes are known to be amongst the earliest of Greek coins, a hemihekte of the issue was found in the foundation deposit of the Temple of Artemis at Ephesus (this deposit is considered the oldest deposit of electrum coins discovered). Temple of Artemis:  One of the Seven Wonders of the Ancient World, it was completely rebuilt three times before its final destruction in 401 AD.
Temple of Artemis