Spend Crypto.
No Signature.
QCard is the first on-chain virtual payment card that doesn't require wallet signatures for everyday spending. Set your limit, bind your wallet, and let the smart contract handle the rest.
Why QCard?
A fundamentally different approach to crypto spending. Not a Visa wrapper — a native on-chain payment primitive.
No-Sign Transactions
Spending below your limit auto-approves via smart contract. Your private key stays cold and safe.
Native On-Chain
Not Visa, not Mastercard. QCard settles directly on QBit Chain. True Web3 native payment.
USDT In, USD Out
Deposit USDT from any wallet. Spend in USD equivalent at any QCard-enabled merchant.
ZK-Proof KYC
Prove compliance without exposing personal data. Your identity stays private, your money stays accessible.
Instant Settlement
Sub-second finality. No T+3 waiting. Merchants get paid instantly on-chain.
Customizable Limits
Set per-transaction and daily limits. Adjust anytime. Full control over your spending.
Your Wallet Signature
Stays Protected
Traditional crypto spending requires a wallet signature for every transaction — exposing your private key to malware, phishing, and front-running attacks. QCard eliminates this by pre-authorizing spending up to your limit via a one-time smart contract approval.
function spend(
address merchant,
uint256 amount
) external {
require(
amount <= spendingLimit,
"Exceeds limit — signature required"
);
// Auto-approve: no wallet sign needed
_transfer(merchant, amount);
emit AutoApproved(msg.sender, amount);
}For Merchants
Accept QCard payments with zero integration friction. Get settled instantly on-chain.
Register
Sign up via the Merchant Portal. Get your API key in seconds.
Integrate
Drop in our SDK or use REST API. 5 lines of code.
Get Paid
Receive USDT settlement directly to your wallet. Instantly.
Ready to go signature-free?
Join the future of on-chain payments. Get your QCard in under 60 seconds.
Launch App →