Stablecoin rails are moving from sandbox to live settlement infrastructure, and the Visa-Lloyds pilot marks the moment a Tier 1 issuer and a global network stress-tested that stack against real transaction flows. For issuer processors and correspondent banking operations, the structural implication is direct: if stablecoin settlement compresses the finality window and reduces nostro prefunding requirements, the liquidity economics of cross-border rails change materially.