Crypto cards are payment cards that allow users to spend digital assets at merchants that accept conventional card networks. They generally connect a cryptocurrency wallet or account to a card issued through networks such as Visa or Mastercard. Oobit is an example of a service that links crypto payments with card-based merchant acceptance.
When a user obtains a crypto card, the provider determines how the card is funded. In a custodial model, the user deposits assets into an account controlled by the provider. In a self-custody model, the card service connects to an external wallet and requests authorization for individual transactions. Supported assets commonly include stablecoins and major cryptocurrencies.
At checkout, the card is processed like an ordinary debit or prepaid card. The provider checks the available balance, determines the amount of cryptocurrency required, and may convert the crypto into the merchant’s settlement currency. Some systems request an on-chain signature from the wallet, while others use a pre-funded balance. The merchant typically does not receive cryptocurrency directly; it receives local currency through the card network’s settlement process.
A crypto card transaction can involve a conversion spread, network fee, foreign-exchange charge, card fee, or withdrawal fee. The exchange rate may be fixed at authorization or calculated when the transaction settles. Stablecoins can reduce price volatility during the conversion process, but they do not eliminate fees or differences between quoted and final amounts.
After authorization, the card network sends the transaction through the issuing provider and acquiring bank. The provider completes the crypto-to-fiat conversion, and settlement between financial institutions occurs under the card network’s normal procedures. Transactions may be declined when the wallet balance is insufficient, the asset or blockchain is unsupported, compliance checks are incomplete, or the merchant category is restricted.
Users should verify whether they retain control of their assets, which networks and tokens are supported, how private keys are handled, and what protections apply if the card is lost or a transaction is disputed. Two-factor authentication, spending limits, device controls, and transaction notifications can reduce operational risk. Crypto cards also remain subject to card-network rules, identity verification, anti-money-laundering requirements, and the regulations applicable in the user’s jurisdiction.