Most brands here take any figure in a range rather than a fixed $25, $50 or $100. That sounds like a small thing and it changes how the product works.
The problem with fixed denominations
You want to buy a $34 game. The card comes in $25 or $50. So you either buy two $25s and leave $16 sitting in a wallet, or buy a $50 and leave $16 sitting in a wallet. Multiply that across a year of purchases and a meaningful amount of your money is parked in balances you did not intend to hold.
Fixed denominations exist because physical cards have to be printed, racked and inventoried, and a rack with eleven variants per brand is unmanageable. None of that applies to a code.
How it works here
Type the figure you want. The price updates live: face value plus the brand's service fee. Each brand has a minimum, a maximum and a step — Amazon is $10 to $500 in $5 steps, Airbnb is $25 to $1,000 in $25 steps, and the product page states the range.
The step exists because our suppliers issue codes in increments, not because we want to limit you. Where a brand genuinely issues any cent value, the step is $1.
It is the same price per dollar
There is no penalty for an unusual amount and no discount for a round one. A $34 card costs face value plus the same percentage as a $50 card. The fixed denominations you see as one-tap pills are shortcuts, not better deals.
The fee does vary by brand — 6% on Amazon, Walmart, Target and Best Buy, 7% to 8% on most gaming and streaming, 10% on general-purpose prepaid — and it is stated before you commit.
Where a custom amount runs into a limit
Coin minimums. The swap provider has a floor per trading pair, so a $5 or $10 card cannot be paid for with every coin. The checkout greys out anything ineligible rather than letting the payment fail after you have sent it. USDT on Tron works at any size.
Network fees on small amounts. A $3 Bitcoin fee on a $11 purchase is nearly 30%. On small cards, use a cheap chain — Tron, Solana or Monero — or buy a larger amount less often.
Brand caps. Some brands cap a single code's value. Where that happens the maximum on our page reflects it, and you simply place more than one order: nearly every brand stacks balances without limit.
The price you see is the price charged
Worth saying because it is a question people have: the amount is re-derived on our side from the brand's own minimum, maximum and step when the order is submitted. It is not read from the form. So the figure on the page is the figure charged, and editing a form field does not buy a $500 card for $5.