Despite the Swiss banning Minarets, Tadawul FX is a Forex broker based in Switzerland offering "Islamic Forex Accounts".
No reference to Shariah scholar or Supervisory board is made. Tadawul FX run operations out of Cyprus and are licensed by Cyprus Securities and Exchange Commission.
According to its website "Islamic forex trading accounts permit clients of Islamic religion to trade on interest free accounts (SWAP free or Roll Over fee) with no extra charge or penalty for the ability to trade in adherence with Islamic religious principles"
More information at: http://www.tadawulfx.com/public/trading-accounts/islamic-forex-account.html