Category 10 E-GOLD
 
e-gold is the only tangibly backed, worldwide electronic monetary&payments system. e-gold is 100% backed by physical gold (silver, platinum, palladium).
http://www.e-gold.com
 
OmniPay offers currency exchange services supporting the e-gold family of currencies, including exchange from:
National Currency to e-metal, e-metal to e-metal, e-metal to National Currency
http://omnipay.1dr.biz