South Korea's Financial Supervisory Service (FSS) has stated that API-based trading now accounts for about 30% of the country's crypto buy-and-sell turnover. The regulator has warned that some traders are using automated tools to inflate volumes and manipulate prices, citing cases involving repeated small trades, spoofed orders, and coordinated activity across multiple accounts. The FSS plans to launch targeted investigations into accounts suspected of using APIs for excessive or abnormal trading patterns. This follows a broader push by South Korea's regulators to clamp down on the abuse of the crypto market. The warning comes as authorities have increased oversight of crypto exchanges following series of operational and fraud-related incidents.