Alipay made Yu'e Bao instant by prefunding withdrawals itself

Chinese money-market funds, like money-market funds generally, settled redemptions on a T+2 delay — an investor requesting their money back would typically wait two business days before the cash actually arrived, a timeline dictated by the fund industry's clearing infrastructure. This delay made a money-market fund fundamentally unusable as a substitute for a spendable cash balance, since customers expect money in an account they can spend to be available instantly, not after a multi-day settlement cycle.

Alipay, launching Yu'e Bao in 2013 to let users earn a better return on idle balances than traditional bank savings while still treating that balance like spendable cash, faced this settlement mismatch directly: the underlying Tianhong money-market fund still operated on the industry-standard T+2 redemption cycle, but users needed to spend or withdraw their Yu'e Bao balance immediately, the same way they would a bank account.

Alipay prefunded withdrawals from its own pool instantly, while the real fund redemption settled with Tianhong on the delayed schedule behind the scenes, netted daily.

Instant payouts made the balance feel like spendable cash, driving adoption.

Daily netting of transactions kept the prefunding operationally manageable at scale.

The underlying fund's safety kept the prefunding risk low enough to be viable.

Scale made the practice systemic, prompting regulators to formalize limits.

When infrastructure lags customer needs, absorb the gap on your own balance sheet rather than waiting for the system to change.

Yu'e Bao grew into the world's largest money-market fund, reaching over 1.13 trillion yuan (roughly $168 billion) in net assets by the end of 2018 and hundreds of millions of user accounts, built entirely on this felt-instant, actually-delayed settlement structure that let ordinary users treat a money-market fund balance exactly like spendable cash without ever experiencing the underlying T+2 delay.