Marqeta is expanding a six-year partnership with Coinbase to let businesses offer payment cards funded by customers' stablecoin holdings. Coinbase will hold the stablecoins and convert between digital and traditional currencies, while Marqeta will issue cards and process payments. Coinbase's Base blockchain will provide onchain settlement infrastructure. The companies said businesses will be able to fund card programs around the clock. The release did not specify fees, a rollout date or which stablecoins would initially be supported.