Crypto Cards Aren't Replacing the Debit Card. They're Copying It.
Crypto card. It sounds like an oxymoron. Debit cards already work; they’re reliable to the point of being boring. A crypto version sounds like a fix for a problem that doesn't exist.
But if that were the case, explain this:
- As of July 2026, more than $2 billion has been spent on crypto cards, according to the on-chain tracker PaymentScan. A year prior, total spend had just eclipsed $100M.
- Monthly transactions climbed from about 130,000 in January 2025 to over 2.1 million by June 2026.
- The leading issuers – RedotPay, KAST, and ether.fi – together account for hundreds of millions of dollars in card spend each month, and they're steadily growing.
It could be a fad. Then again, Bitcoin was a fad too – a decade ago. People are clearly getting something out of crypto cards. So, what’s the deal?
The flawed argument against crypto cards
The most common argument against crypto cards is based on a false premise.
To explain how, let's buy a coffee. It's $5 from the local cafe.
In one scenario, you use your debit card at the reader. You swipe or tap your card, the payment is pending for a bit, and then after a day or two the $5 leaves your account for that coffee. Done deal.
In the second scenario, you use a crypto card connected to your Bitcoin wallet. Things can vary a lot here, but for the sake of example, let's say it's set up to sell off $5 worth of Bitcoin at the point of sale.
If you know how tax law in the US works, you may see where this is going. This is the exact scenario that a sharp crypto skeptic would point out to explain why crypto cards are absurd.
The IRS does not treat Bitcoin as money. Since 2014 it has treated cryptocurrency as property, like a stock or a piece of real estate. Selling it, trading it, or spending it counts as a disposal, and a disposal is a taxable event. So when your card sells $5 of Bitcoin to cover the coffee, you aren't just paying for coffee. You're selling property, and you may owe tax on any gains.
If you picked up that $5 of Bitcoin back when it cost $2, you have a $3 capital gain to report. Now you're tracking cost basis and holding periods on a latte so you don’t commit tax fraud.
That's the leading argument against crypto cards, and no doubt it's compelling.
But the argument is based on a false assumption. Crypto cards can work this way, but most don’t.
Many of the leading card issuers today deliberately avoid selling crypto in a way that would trigger capital gains tax. And no, it isn't a tax loophole. Here’s how they do it.
Dispelling the myths about crypto cards
There are two ways crypto card providers work around the capital gains problem: the card spends from a stablecoin balance, or the card borrows against cryptocurrency held as collateral.
Stablecoin cards
A stablecoin is a cryptocurrency pinned to the value of a fiat currency or another asset, almost always the US dollar. Stablecoins aren't held for investment the way Bitcoin or Ethereum are; they exist to move money on the blockchain.
Because a stablecoin holds its value, spending one produces little or no gain, so it doesn't create the capital gains bill that spending Bitcoin does. Technically the sale is still a disposal, but with no appreciation there's nothing to tax. Lawmakers have started to formalize this: proposals in Congress would treat dollar-pegged payment stablecoins as cash for tax purposes, with no gain or loss recognized as long as the coin stays within about one percent of a dollar.
There's a safety angle too. Following the passage of the GENIUS Act in 2025, issuers are required under U.S. law to back every payment stablecoin with hard assets like cash or short-term U.S. Treasury bills, which lowers the risk of a liquidity problem when you use tokens from a regulated domestic issuer like USDC.
For those reasons, many crypto card providers, including Gnosis Pay, Kast, and MetaMask Card, center their cards around stablecoins rather than exchange-traded crypto. Slash does the same with its Global Card, which spends from a balance held in USDSL, our own dollar-pegged stablecoin.³
Borrowing against crypto
The other way crypto cards can feasibly work is by borrowing against crypto used as collateral. This is the crypto world's version of a secured credit card, where you put up a cash deposit as collateral for a line of credit to borrow against. Hold Bitcoin in a wallet, work with a provider that will accept that wallet as collateral, and then spend borrowed cash against it.
This is a workaround, because you aren't actually spending crypto at the point of sale. It's really a reworked version of how investors get loans by borrowing against their portfolios.
It comes with a tradeoff, though: your spending power is tied to an asset that can drop hard and fast. If Bitcoin falls far enough, the lender can issue a margin call or liquidate your collateral to cover the loan, and a forced sale in a downturn is the worst possible time to be selling, tax bill included. So this type of card is generally for the true believers, the people willing to base their daily spending on the balance in their crypto wallet.
The argument in favor of crypto cards
Even though crypto cards can work in many different ways, there’s one core idea tying them together: crypto cards remove friction from an increasingly disconnected financial system.
Crypto can be difficult to deploy in the real world. Every time you want to use it as cash, it usually means selling the crypto on your exchange, transferring the funds to your bank account, and then spending them. A crypto card gets rid of the middle steps. It's not revolutionary, but it makes crypto more usable day to day.
Where it gets more interesting is in the edge cases. One of crypto's advantages is that it evens out access to the global financial system. Say you run a small software agency in São Paulo, but most of your clients are in the United States. Getting paid the usual way means international wires, days of waiting, bank fees, and the exchange spread each time dollars are converted to reais.
With crypto, you skip most of that. A US client can send USDC to your wallet, and you receive US dollar value almost instantly. It’s as easy as handing over cash, if not easier.
But the problem that dogs crypto everywhere still applies in São Paulo: the infrastructure to actually spend it isn't there yet. So you end up with a pile of sitting stablecoins that you can't easily use. Turning it into something spendable requires selling the stablecoins, converting to reais, and moving the money into a local bank account, paying fees on the way in and on the way back out.
A crypto card removes that round trip. It lets you redeploy your USD directly without losing value to conversions and transfers every time you need to buy something.
Take Slash's Global USD account, which is built for businesses outside the United States. Global USD lets you hold a USD balance, access the ACH network, and spend through a linked card. The balance is held in USDSL, Slash's own stablecoin, pegged one-to-one to the dollar and backed by short-term US Treasuries and cash.
The Slash Global Card, issued on Visa through the card infrastructure company Rain, makes a USD crypto balance usable everyday in over 130 countries. Our São Paulo agency owner can hold dollars as USDSL and then pay a US software subscription, run ad spend on a US platform, or settle a supplier invoice anywhere Visa is accepted, all in dollars, without converting to reais and back.
The cardholder never touches a wallet, a private key, or an exchange. To them, it's a normal Visa card that happens to spend US dollars. The most compelling version of a crypto card is the one where you never realize it’s crypto at all.
That brings us back to our initial question: why would anyone want to change how debit cards work? No one does. In fact, it’s the opposite. Cards got so good at making spending easy that crypto wanted in.
