If you’re unfamiliar with Swagbucks, I discuss it in much more detail in my blog article.
You can often earn a significant number of points on Swagbucks and Treasure Trooper by signing up to free trials but this generally requires you to specify a credit card. This can be nerve-wracking if you’re not 100% sure the site is trustworthy.
One way of limiting the risk is to use a virtual MasterCard with only a small amount of money associated with it. Virtual MasterCards work identically to standard credit cards except that they’re limited in value.
One way of obtaining these is by redeeming Swagbucks for them as explained here.
Spare Time Income 