Key Points
- 1Toss Securities is launching an Open API service for automated domestic and international stock trading, intensifying competition in the brokerage industry's API market.
- 2The service provides a unified interface using standard REST and WebSocket technologies, featuring high connectivity with AI platforms like ChatGPT for asset analysis and automated trading strategies.
- 3Currently accepting pre-applications, Toss Securities' Open API will apply existing fee rates, with domestic stock transaction fees waived until June 2026.
Toss Securities has introduced an Open API (Application Programming Interface) service, enabling the automation of both domestic and international stock trading. This move positions Toss Securities as a significant competitor in the burgeoning market for advanced trading APIs targeting individual investors.
The service, currently open for pre-registration to existing Toss Securities account holders, aims to provide a robust infrastructure for algorithmic trading. It enters a market where competitors like Korea Investment & Securities have already offered overseas stock REST APIs, and Kiwoom Securities has launched multi-OS REST APIs, expanding to include the KRX Gold Market.
The core methodology underpinning Toss Securities' Open API is the REST (Representational State Transfer) architecture combined with WebSocket technology. Unlike older, Windows-specific APIs that necessitated the constant operation of a Home Trading System (HTS) client, this new RESTful API leverages web standard technologies. This allows for direct data exchange with the securities company's servers without the need for separate software installations, thereby overcoming traditional constraints related to operating systems (OS) and devices. It facilitates the implementation of automated trading systems remotely, compatible with various environments such as smartphones, web browsers, and Linux servers, making it an essential tool for algorithmic traders.
Specifically, Toss Securities' offering is distinguished as an 'Integrated API', providing a unified interface for managing both domestic and international stock transactions. The implementation adheres to standard REST principles for stateless communication and utilizes WebSocket for persistent, full-duplex communication channels between the client and server, crucial for real-time market data updates and immediate command execution.
A significant feature is its enhanced connectivity with AI platforms. Investors can link their Toss Securities API keys to external Large Language Models (LLMs) such as ChatGPT or Claude. This integration allows for conversational commands, enabling users to perform actions like "Analyze my portfolio yield" to retrieve real-time asset valuations and market price inquiries. Furthermore, the API facilitates the automatic execution of advanced trading strategies, such as split trading, particularly beneficial for managing US stock transactions during differing time zones without continuous manual monitoring.
Access to the service will be granted sequentially to pre-registered users, with API keys obtainable via the Toss Securities PC website. The trading fee structure for the API service remains consistent with existing Toss Securities account rates, including a fee exemption for domestic stock transactions until June 2026. Toss Securities emphasizes its commitment to delivering a developer-friendly Open API that is also intuitive enough for general investors, aiming to offer a valuable option for leveraging AI platforms in investment strategies.