Every contribution to a GiftyPot pot includes one flat transaction fee: 2.9% + £0.25. It's charged once per contribution and never varies by card type. Guests can choose to cover the fee so 100% of their intended amount reaches the pot, or decline and have it deducted from what the pot receives.
A guest contributes £50.00:
If you cover the fee, the pot receives the full £50.00 you intended and you pay £51.70 in total. If you don't, you pay exactly £50.00 and the pot receives £48.30 after the transaction fee.