See the following article for detail on Pledgeling's fees:

It summarizes the charges for:

  • credit card processing (2.9% + 30¢ per charge)
  • One of the following usually apply, although there are exceptions if the costs are sponsored or the donor elects "cover our costs:"
    • technology fee (if the donation form was not configured for optional tips)
    • tips, if enabled. Tips are optional and adjustable by the donor.
  • per-check fee for disbursements
  • fee for disbursements to organizations outside the U.S.