If the market falls, some balances change in dollar value and some do not. This article explains which is which and how it affects card spending.
Published September 29, 2026 · 2 min read
No. A price drop changes what your coins are worth, not how many you have. If you hold a set amount of BTC or ETH, that amount stays the same, while its value in dollars goes up and down with the market. A stablecoin balance is meant to stay close to one dollar per coin, so its dollar value should barely move.
A balance in a stablecoin like USDT or USDC is designed to track the dollar. That is why a fall in bitcoin's price does not change its dollar value. The word designed matters: this describes how the assets are meant to behave, not a promise. This is general information, not investment advice.
A balance in BTC or ETH moves with the market. When the coin's price falls, the same balance is worth fewer dollars. When the price rises, it is worth more. The wallet does not soften these moves in either direction, so the dollar figure you see today may differ tomorrow.
The card spends whatever your balance is worth at the time of the payment. If you hold BTC or ETH, the same purchase can draw on a different amount of coins depending on the market that day. The card also works only with the available balance, with no credit and no overdraft, so you cannot spend more than you have. The table below sums up the difference between the two kinds of balance.
| Balance held in | Dollar value when the market falls | Effect on card spending | Swap to another coin in the wallet |
|---|---|---|---|
| USDT | Designed to track the dollar, so it should not change | Spent at its dollar value at the time of payment | 0%, no markup |
| USDC | Designed to track the dollar, so it should not change | Spent at its dollar value at the time of payment | 0%, no markup |
| BTC | Moves with the market and can be worth fewer dollars | Spent at whatever it is worth at the time of payment | 0%, market rate of that moment |
| ETH | Moves with the market and can be worth fewer dollars | Spent at whatever it is worth at the time of payment | 0%, market rate of that moment |
Yes. Swapping between coins in the Nexus Pay wallet costs 0% and uses the exchange rate with no markup, so going from a volatile coin to a stablecoin has no swap fee. You still get the market rate at that moment, and the amount you receive is shown before you confirm. If the price has already dropped, the swap fixes the lower value in dollars. This is general information, not a recommendation to buy or sell.
A useful starting point is to separate money by purpose. Consider these questions:
The choice is personal, and this article is not investment advice.
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