Soybean futures are traded on various commodities futures exchanges around the world:
USA: Soybeans - CME Group Trade grains and oilseeds futures and options including corn, soybeans, soybean oil, and more with CME Group.
South Africa: Agricultural Derivatives from the JSE provide a platform for price discovery and efficient price risk management for the grains market in South and Southern Africa.
China: Founded in 1993, the Dalian Commodity Exchange (DCE) is a futures exchange approved by the State Council and regulated by China Securities Regulatory Commission (CSRC).
Japan:
Osaka Dojima Commodity Exchange, current prices: http://ode.or.jp/market/eng_price_soy.html
Tokyo Commodity Exchange Quotes for Soybean
India: National Commodity & Derivatives Exchange Ltd. (NCDEX)
Argentina: Rosario Futures Exchange (ROFEX)
Brazil: BM&F BOVESPA
https://en.wikipedia.org/wiki/Soybean#Futures