How the fees compare
Both add a 5% platform fee on the face value of a card purchase. Orbio's quote includes card processing; smaaart's checkout adds card processing and taxes on top of its quote, so compare carefully when the two are close.
Both cap card purchases at $5 to $2,000 each. Orbio also sells credits on-chain (USDG on Robinhood Chain), with different fees.
Why depth matters more than the headline discount
A book's best discount only applies to its cheapest slice. Once that slice is bought, the next buyer gets the next one. The deeper a book is at good prices, the longer the discount lasts for large purchases. The table above walks both books at every size, so you see the price you'd actually pay, not the best one.
Want the whole field? See the live comparison or estimate your bill with the cost calculator.