According to Coinnet, South Korean stocks posted their biggest single-day gain in nearly a month on Tuesday, as hopes of a US interest rate cut spurred risk appetite in global financial markets. South Korea's benchmark KOSPI index closed up 50.25 points, or 1.60%, at 3,198.00, its largest percentage gain since July 8. Of the 934 traded stocks, 687 advanced and 190 declined. Foreign capital saw a net inflow of 291.9 billion won (US$210.31 million). Samsung Securities analysts said the probability of a September Federal Reserve rate cut was nearly 100%, contributing to the market's rally.