The answer depends mainly on the business plan of the company. Most reputable fundraising websites offer a fixed amount of about 5% along with payment processing fees at another 3% per donation. Some of the best crowdfunding platforms won’t charge you the fixed part, or may offer special deals for microdonations (payments that are below a specific threshold). Before you decide whether the best crowdfunding sites are worth your time and money, make sure you understand exactly what you’re getting. Paying a bit more to get extra exposure on a high-profile website might be a solid investment.