Korean Stock Data API

The only source-accurate
Korean stock fundamentals API

Not resold. Not scraped. Parsed directly from DART XBRL — the same regulatory filings Korean companies are legally required to submit.

Get free API key View endpoints
1,200+ Stocks covered
95%+ Data accuracy
10yr Historical depth
0.927 Crisis index AUROC
Why SEFCON

Built on source data,
not a data vendor

Most Korean stock APIs resell FnGuide or KisValue. SEFCON parses DART XBRL directly — the same regulatory filings Korean companies are legally required to submit. No intermediary, no markup, no missing quarters.

📄
DART XBRL parsing
Revenue, operating income, net income, EPS, ROE, OPM, FCF, debt ratio — parsed from original regulatory filings.
📊
Proprietary SCI scores
Composite quality score combining profitability, EPS growth, FCF conversion, and institutional flow signals.
🌐
Macro crisis index
SEFCON crisis model with AUROC 0.927 — identifies Korean market stress phases using 34 macro indicators.
API Reference

Six endpoints.
Everything you need.

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

GET
/v1/universe
All 1,200+ active tickers with market, sector, sub-sector, market cap
Free
GET
/v1/financials?ticker=005930
10-year annual financials from DART XBRL. Revenue, OPM, ROE, FCF, EPS, BPS, DPS and more.
Free
GET
/v1/scores?ticker=005930
SCI score, grade (S–D), component scores, smart money signal
Pro
GET
/v1/sectors
Industry cycle stage for 19 sectors — expansion / slowdown / contraction / recovery
Pro
GET
/v1/macro
SEFCON crisis index history + Korea/US macro indicators
Enterprise
GET
/v1/smartmoney?ticker=005930
Proprietary institutional flow signal (SUPERNOVA / ACCUMULATION / NEUTRAL / ESCAPE)
Enterprise
example.py 
# 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,...}]}
Pricing

Start free.
Scale when you're ready.

No credit card required to get started. Email us for a free API key.
💡 Save 20% with annual billing — 2 months free.

Free
$0
/ month
  • ✓ 100 requests / day · 100 unique tickers / month
  • ✓ /v1/universe
  • ✓ /v1/financials (3-year history)
  • ✗ 10-year history
  • ✗ SCI scores
  • ✗ Sector cycles
  • ✗ Crisis index
Get free key →
Pro
$199
/ month
or $1,910 / year (save $478)
  • ✓ 5,000 requests / day
  • ✓ All Free endpoints
  • ✓ 10-year history
  • ✓ /v1/scores (SCI grade)
  • ✓ /v1/sectors (19 sectors)
  • ✗ Crisis index
Get Pro access →
Enterprise
$499
/ month
or $4,790 / year (save $1,198)
  • ✓ 50,000 requests / day (fair use)
  • ✓ All Pro endpoints
  • ✓ /v1/macro (crisis index)
  • ✓ /v1/smartmoney signals
  • ✓ Priority support
  • ✓ SLA guarantee
Contact us →
Custom
$999+ / mo
Talk to founder directly
  • ✓ Everything in Enterprise
  • ✓ Dedicated Slack channel
  • ✓ Custom endpoint design
  • ✓ Bulk data export
  • ✓ NDA & custom contract
  • ✓ Direct founder support
Schedule a call →

* Financial history depth varies by company listing date.