CoinAdShare, apart from advertising service, also offers E-currency Exchange service:

You can exchange between:

 

Bitcoin                        To        SolidTrustPay                            => 2.5%

 

SolidTrustPay             To         Bitcoin                                     => 2.5%

 

SolidTrustPay             To         PerfectMoney                         => 2.5%

 

PerfectMoney          To         Bitcoin                                     => 2.5%

 

Bitcoin                      To         PerfectMoney                         => 2.5%