Automated Korean stock trading GUI — connect KIS OpenAPI

Roughly 6 million active retail traders in Korea increasingly want programmatic strategies but face fragmented tooling: current solutions either require coding, route through third‑party execution layers, or lack Korean‑language UX and compliance features — leaving non‑technical traders unable to reliably backtest, deploy, and monitor automated strategies. These users also face practical barriers like maintaining API keys, handling broker rate limits, and configuring risk controls, which increases operational and execution risk for individuals and small teams. You could build a desktop/web GUI that connects directly to KIS OpenAPI (Korea Investment & Securities) to provide one‑click authentication, a visual strategy builder, integrated backtester on local and hosted historical data, scheduler/execution engine, real‑time monitoring, and a marketplace for prebuilt strategies and plugins; adding AI‑assisted strategy generation and parameter search would lower the skill barrier for non‑programmers. Monetization can follow the $200/year archetype (subscriptions, plugin fees, hosted backtests), with additional revenue from a marketplace take rate and managed‑hosting tiers. This is an attractive moment: the Korean retail market is roughly $1.2B annually by our estimate (6M users × $200), broker APIs are maturing, and retail algo adoption plus AI tools are expanding demand for approachable automation. To stand out you'd need tight integration with KIS (authorized, low‑latency execution), Korean localization, robust compliance and built‑in risk controls, and a strong marketplace/community — but expect medium competition, nontrivial regulatory and operational complexity, ongoing maintenance costs for execution reliability, and the need for partnerships to scale quickly.