If the service allows Credit Cards / Debit Cards as a payment, it's not safe.
For U.S. Customers you can use Dwolla.
europe/holland here
Sold 1kk to torres.
Sold 3kk to torres.
Got scammed for 23kk to absdotman = tibiagps (skype) = tibiabuyer (skype)
Sold 15kk to Punktg
Sold 15kk to Pidek098