Because the value of copper coins rose against that of gold and silver coins, whose quality level had decreased and whose circulation had increased since the remintage of koban (oval gold coin) and Chogin (collective term for silver), and also because Besshidozan Copper Mine started to produce more copper, zeniza was established in Shichijo by members of itowappu nakama (the thread tally union) in Kyoto from April 1700 to January 1708 to mint a thin and small type of Kanei Tsuho, and Hoei Tsuho after February 1708.
元禄から宝永にかけての小判および丁銀の改鋳以降、品位が低下し通貨量が増大した金銀貨に対し銭相場が高騰し、また別子銅山からの銅の産出が増大したことを受け、元禄13年（1700年）3月から宝永5年（1708年）1月にかけては京都糸割符人により七条に銭座が設けられ、薄肉小型の寛永通寳が鋳造され、同年の2月からは宝永通宝が鋳造された。