SAN FRANCISCO (MarketWatch) -- Shares of WPCS International Inc. wpcs jumped in the extended session after the firm said its BTX Trader unit launched a beta version of a platform to trade bitcoins. Shares of WPCS rose 14% to $1.72 in moderate volume. The platform, available at www.btxtrader.com, combines data and order execution on the five most popular bitcoin exchanges, WPCS said. The volatile digital currency last traded around $799, according to Mt. Gox.