In 1730 (Kyoho 15), the Edo shogunate officially approved the rice trading that had been taking place in Dojima, Osaka. There were two markets: a spot market that traded rice tickets (shomai akinai), and a futures market that traded representative grades of rice on the books (choaimai akinai).
Japan Exchange Group describes the Dojima Rice Market as the origin of Japan's exchanges and as widely known as a forerunner of organized futures exchanges. The timeline says "Dojima Rice Market," but the article covers the same market under its Edo-period name, the "Dojima Rice Exchange." The futures market was choaimai akinai, which traded on the books.