In February 708, a Saijusenshi (A Ryoge no kan in charge of administering coinage) was appointed and in May the same year, silver coins of Wado Kaichin were issued with copper coins coming in August.
708年2月に催鋳銭司がおかれ、同年5月にははやくも和同開珎の銀銭、同じく8月には銅銭が発行されている。