Toss Securities has launched its "Toss Securities Open API," a service that allows investors to place stock orders and check account information by talking to artificial intelligence through large language models (AI systems that understand text). The company said the rollout began on the 13th after limited access for preregistered users since May, and the service is now available to all investors. By linking an issued API key to external LLMs such as ChatGPT and Claude, users can turn plain-language investment instructions into trades without separate coding. Toss Securities combined Korean and overseas stock trading functions into one open API (software interface for external apps), giving users access to price lookups and order placement across both markets. An official at Toss Securities said demand will grow for AI tools that help investors design individual investment strategies and apply them to actual trading, and the company plans to expand related features.