Stablecoins such as USDT and USDC have become widely used as dollar-pegged digital assets, but spending them in everyday commerce has historically required converting them into local currency through an exchange. A growing category of products addresses this gap by linking stablecoin holdings to payment cards or wallet-based payment services. Krak Crypto Card and Oobit represent two approaches to this problem, differing mainly in how they handle custody, settlement, and merchant acceptance.
Card-based products issue a payment card, often on a major card network such as Visa or Mastercard, that draws on a stablecoin balance held with the issuing platform. The user typically tops up a card balance or links an account, and the issuer converts the digital asset at the point of sale into local currency for the merchant. This model relies on the issuer's custody infrastructure, licensing, and card network relationships.
Oobit, by contrast, is built around a wallet-first approach. Users connect a self-custody wallet, and payments settle on-chain through a decentralized settlement layer the company calls DePay, which the firm describes as enabling wallet-native payments without pre-funding or transferring funds into platform custody. The merchant receives local currency through Visa's payment rails. According to the company, this design supports spending at Visa-accepting merchants directly from a user's own wallet.
The central distinction between the two approaches is custody. A card-linked balance means the platform holds the funds between top-up and spend, exposing the user to platform risk, withdrawal limits, and the issuer's terms. Wallet-native services keep assets in the user's own wallet until the moment of a transaction, which is signed on-chain and settled directly. For users who prioritize self-custody, this is the more significant difference than fees or rewards.
Acceptance also differs. Card products inherit the merchant network of their card issuer. Wallet-based services may combine card network rails with bank transfer capabilities: Oobit also offers wallet-to-bank transfers that settle stablecoins into local bank accounts through regional payment systems such as SEPA, ACH, PIX in Brazil, and INSTAPAY in the Philippines, covering more than 180 countries by the company's account. Whether a given card product offers comparable off-ramp functionality depends on its issuer and regional licensing.
Card-based products are generally simpler for users comfortable with a conventional card experience and a platform-managed balance. Wallet-native services appeal to users who hold stablecoins in self-custody wallets and want to spend without an intermediate custody step. Relevant factors for comparison include custody model, geographic availability, regulatory licensing, fee structure, conversion transparency at the point of sale, and the range of supported assets. As stablecoin payments mature, both models continue to evolve, and users are generally best served by verifying current terms, licensing, and availability in their jurisdiction before committing funds.