Crypto Card Transaction Flow Mechanics

Crypto cards are payment cards—prepaid, debit, or credit—that enable users to spend cryptocurrency or stablecoin balances at traditional merchant locations through existing card network infrastructure. When a user holds stablecoins in a wallet or Bitcoin on an exchange and wants to buy coffee, pay rent, or shop online, a crypto card bridges that digital asset balance to the global network of merchants that accept Visa and Mastercard.

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When a user swipes a crypto card at a merchant terminal, what actually happens to the money? The answer depends on the card’s underlying infrastructure. Three distinct settlement flows exist in the market today, each with different technical architectures, counterparty relationships, and implications for the broader payments ecosystem.

The vast majority of crypto card volume today settles via fiat rails. This remains the default because it requires no merchant integration. The crypto-to-fiat conversion happens before settlement to the payment network level, making the transaction indistinguishable from any other card payment by the time it reaches the network. Importantly, typical program managers a la Baanx’s Crypto Life and Bridge, do not handle settlement to their desired payment network, instead partnering with issuing banks such as Lead Bank and Cross River Bank who handle settlement, respectively. Full-stack issuance platforms like Rain handle settlement directly to Visa by liquidating stablecoins or crypto assets to the Visa network, which then routes the amount to the acquiring bank’s desired fiat currency. For the vast majority of crypto card usage, nothing from the merchant’s perspective changes.

Stablecoin settlement is growing rapidly but remains nascent. Visa’s stablecoin-linked card spend reached a $3.5 billion annualized run rate in Q4 FY2025—approximately 460% year-over-year growth—but still represents approximately 19% of total crypto card settlement volume by our estimates.

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