A crypto card lets you spend cryptocurrency, usually stablecoins such as USDT or USDC, anywhere Visa or Mastercard is accepted. Chinese-speaking users call them "U-cards" (U 卡) because they're mostly topped up with "U" (USDT). To the merchant it's an ordinary debit or prepaid card charging in the local currency. Behind the scenes, your crypto is converted to fiat at the moment you pay or when you top up.
These cards are useful for travellers, freelancers paid in stablecoins and people in the crypto ecosystem. They are not bank accounts, they carry real risks, and many issuers do not accept residents of mainland China. Read U-card risks before depositing money.
Who is involved in a card
| Party | Role | Example |
|---|---|---|
| Card network | Runs the rails and merchant acceptance | Visa, Mastercard |
| Issuer / BIN sponsor | A licensed bank or e-money institution that legally issues the card number (the BIN is its first 6–8 digits) | Regional banks and EMIs, often in the EU, UK, US or Asia-Pacific |
| Program manager | The crypto company whose app and brand you see | RedotPay, KAST, Bybit, Crypto.com… |
| Processor | Authorises transactions in real time | Various payment processors |
| Custody / liquidity | Holds your crypto and converts it to fiat | The program manager, an exchange, or your own smart-contract wallet |
Why this matters: if the BIN sponsor loses its licence or drops the programme, the card stops working even if the crypto company is healthy. This happened to several cards in 2025–2026, when the Polish licence of the issuer behind the CEX.IO Card and others was revoked.
How a purchase works
- You deposit USDT or USDC into the card app (on-chain, or from an exchange account).
- Depending on the card, the balance is either pre-converted to a fiat balance (for example USD) or kept in crypto until you spend.
- At checkout, the merchant charges, say, 50 EUR. The processor asks the programme whether you have enough funds.
- The programme converts the needed crypto at its rate and adds a conversion spread or FX fee if needed. The payment is approved in milliseconds.
- The merchant receives normal fiat through Visa or Mastercard.
Costs are usually hidden in three places: the crypto-to-fiat conversion (around 0–2%), the FX fee when the merchant's currency differs from the card currency (around 0–2.5%), and issuance, ATM or top-up fees. Check the comparison in U-card comparison.
Custodial vs self-custodial
| Model | How it works | Examples (as of September 2026) | Pros | Cons |
|---|---|---|---|---|
| Custodial | The company holds your crypto, like an exchange balance | RedotPay, Bybit Card, Crypto.com, OKX Card, KAST, Nexo | Easy, customer support, fiat top-ups | Freezes and insolvency risk; you trust the company |
| Self-custodial | Funds stay in your own smart-contract wallet (for example a Safe), and the card is allowed to pull only what you spend | Gnosis Pay (via Zeal in the EU), ether.fi Cash | You control your keys; less counterparty risk | On-chain complexity; smart-contract risk; still needs KYC; fewer regions |
What KYC to expect
Almost every legitimate card requires:
- A passport or national ID from a supported country
- A selfie or liveness check
- Proof of address (utility bill or bank statement, usually under 3 months old) in a supported country of residence
- Sometimes source-of-funds questions for larger balances
- Sanctions and PEP screening
Eligibility depends on where you live, not only your nationality. Many issuers list mainland China as unsupported, and some exclude the US, Singapore, Canada or others.
Before you apply
- Read the issuer's supported and unsupported countries page and check that your residence country is listed.
- Check the fees: issuance, top-up, conversion, FX and ATM.
- Check which network it uses and whether Apple Pay or Google Pay is supported in your region.
- Find out who the issuing institution is. It's in the card terms, usually near the bottom.
- Start with a small deposit and a test purchase.
- Understand your tax and legal position. Spending crypto can be a taxable event. See U-card risks.
FAQ
Is a U-card a credit card? No. It's debit or prepaid: you spend money you've already deposited. (Nexo is an exception, offering a credit line against crypto collateral.)
Can I use it for US online subscriptions? Often yes, but some merchants decline prepaid or foreign BINs.
Do I get a bank account number? Usually not. A few products (for example Fiat24's Swiss IBAN) combine a card with an account.
