Coinbase and Citi have expanded their partnership with two U.S. business payment services that provide conversion routes between fiat currency and stablecoins. Coinbase Virtual Accounts, powered by Citi's Virtual Account Wallet, automatically convert incoming fiat into stablecoins and offer a 3.75% annual yield on USDC balances. Citi institutional clients can also accept stablecoin payments through Spring by Citi while receiving fiat currency. Coinbase converts the stablecoin payment and Citi, acting as the bank of record, settles the transaction, allowing merchants to avoid holding stablecoins. The services, announced September 28, 2026, build on a partnership disclosed in October 2025 that initially focused on fiat pay-ins and pay-outs for Coinbase on-ramps and off-ramps. Neither company disclosed customer numbers, payment volumes, pricing, supported currencies or supported stablecoins. The yield feature arrives as implementing rules for the GENIUS Act remain under review before the law takes effect in January 2027.