The only source-accurate
Korean stock fundamentals API

Built on source data,
not a data vendor

Every other Korean stock API resells FnGuide or KisValue — third-party vendors with licensing restrictions, missing quarters, and foreign resale bans. SEFCON is the only API that parses DART XBRL directly — Korea's official SEC-equivalent regulatory filings. No intermediary. No markup. No missing quarters. No resale restrictions.

Six endpoints.
Everything you need.

All endpoints return clean JSON. Authentication via API key header or query param.

# Get Samsung Electronics 10-year financials
import requests

resp = requests.get(
    "https://api.sefcon.kr/api/v1/financials",
    params={"ticker": "005930"},
    headers={"X-Api-Key": "YOUR_API_KEY"}
)

data = resp.json()
# → {"ticker":"005930","name":"Samsung Electronics",
#    "source":"DART XBRL","accuracy":"95%+",
#    "financials":[{"year":2025,"revenue_bn_krw":3336059,
#    "opm_pct":13.07,"roe_pct":10.85,"fcf":806841,...}]}

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* Financial history depth varies by company listing date.