Sponsorships that are paid via checks or wire generally do not have a transaction fee. However small transaction fees are applied to sponsorships paid through Eventbrite and Paypal.
The Paypal fee is 2.93% + $0.30. An additional 1% cross-border fee and/or 2.5% currency conversion fee is applied for non-USD currencies. You can find the current breakdown of Paypal's merchant fees here.
Gross Amount Fee Net Fees
$1,000 USD $29.60 $970.40 (2.93% + 0.30)
$1,000 CAD $39.15 $960.85 (3.8% + 0.30