Swapping one coin for another inside a wallet looks like a single button, but it differs from sending crypto across a blockchain. Here is what happens, what it costs and what to check before you confirm.
Published September 30, 2026 · 3 min read
A swap converts the balance of one coin into a balance of another within the same account. The funds never leave the wallet: no transaction is broadcast to an outside address, and no one else receives anything. You start with, say, BTC or ETH in your balance and end with USDT or USDC in the same balance. In Nexus Pay, the wallet holds USDT, USDC, BTC and ETH, so those are the coins you work with.
An on-chain send moves a coin from your wallet to another address through a blockchain network. That step is irreversible, and it requires the right address and the right network. A swap involves neither: it is a change of what you hold, not a movement of funds to someone else. The table below sets the three common operations side by side.
| Operation | Where the coin goes | Blockchain network involved | What to check first |
|---|---|---|---|
| In-wallet swap | Stays in your account; one coin becomes another | No, nothing is sent on-chain | The amount you receive, shown before you confirm |
| On-chain send | Leaves the wallet for an outside address | Yes, a network fee applies | Address and network; the transfer cannot be reversed |
| Deposit into the wallet | Arrives at your deposit address | Yes, one specific network per address | Matching network and the minimum deposit shown in the app |
Before you confirm, the wallet shows the amount you will receive in the new coin. The swap uses the exchange rate with no markup and costs 0%, so the number on the screen is the result of the conversion itself, without an added spread from the wallet. Read that figure the way you would read a total at a till: if it is not what you expected, do not confirm. The rate at the moment you confirm is what matters, especially for volatile coins.
A network fee is the price of getting a transaction recorded on a blockchain. An on-chain send needs that. A swap stays inside the account, so no on-chain transaction is created and no network fee is charged. This is the main practical difference in cost between swapping inside the wallet and sending a coin out to convert it elsewhere. The fees that remain are the ones tied to other actions, such as moving money to a card.
Swapping a volatile coin such as BTC or ETH into USDT or USDC is a common way to lock in steady dollar value for spending. It does not undo any price movement that has already happened, and it means you no longer hold the original coin if it rises later. This is general information, not investment or tax advice; how swaps are treated for tax depends on where you live, so check your local rules or ask a qualified adviser. For everyday budgeting, many people simply keep the amount they plan to spend in a stablecoin.
The Nexus Pay card only spends the available balance, with no credit and no overdraft. A typical route is to swap into a stablecoin at 0%, move it to the card, then pay. Moving money from the wallet balance to the card costs 0.1%; card purchases cost 0%. For example, 1000 USDT moved to the card becomes $999.00. Before you swap, check that the amount you plan to spend is the amount you will hold afterwards.
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