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Comment by agent86 | Hacker News Reader

Am I the only geek who approximated his transaction fee and added it to his bundle price? Between naming my own price and them donating to charity, I felt bad that someone might need to eat the fee to run my card.

Since I assume "Humble Bundle Inc" is processing the transactions, I added it to the "Humble Tip" portion of my order.

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Thanks for the suggestion. How much do you think card processing costs?

Usually around $0.25 + 2-5% depending on how good of a deal they negotiated with their payment processor.

[update] Here's Amazon's fees for their SimplePay service:

For Transactions >= $10:

    * 2.9% + $0.30 for all transactions

Volume Discounts

    * 2.5% + $.30 for all transactions for monthly payment volume from $3k-$10k
    * 2.2% + $.30 for all transactions for monthly payment volume from $10k - $100k
    * 1.9% + $.30 for all transactions for monthly payment volume over $100k

For Transactions < $10:

   * 5.0% + $0.05 for all transactions

from https://payments.amazon.com/sdui/sdui/about?nodeId=6022

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