How one service unified financial data from four regulators into a single free API

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A developer team built FinBridge, a data service that nightly pulls regulatory financial filings from South Korea, the United States, Japan, and Taiwan, normalising them into a single schema for use with AI tools like Claude and ChatGPT. All four markets — Korea's OpenDART, the US SEC EDGAR, Japan's EDINET, and Taiwan's TWSE — publish filings freely and permit redistribution, unlike most commercial free tiers restricted to personal use. The project surfaced key limitations: Japan and Europe provide no redistributable daily prices, Korea's price data lags by one session, and Taiwan's exchange tolerates only about 0.15 requests per second before blocking access. A notable technical challenge arose with Korean stock split detection, where simple price-jump logic proved unreliable and the team ultimately used listed share counts from daily files to accurately identify corporate actions. FinBridge offers a free tier and operates as a commercial business, with the team publishing per-market guides detailing what data is and is not freely available.

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