Korea Company Data — developer kit
Paused — data available on request. The REST API, the MCP server and sign-up are switched
off for now, so the CLI and MCP server here cannot fetch anything at the moment.
The data is not gone: it can be provided on request. Email
support@notonlystock.com with what you need — which companies
or rail data, which fields, and in what form — or leave a note on the
feedback page.
The data guide and API reference stay up, and existing keys and credits are kept for when the API reopens.
Korean company records in English: identity, registration status, industry, address,
and month-by-month employment from government payroll records.
Plus nationwide rail — every subway and commuter-rail stop, route and departure,
eleven operators reconciled into one GTFS-shaped dataset.
Three ways in, one API key.
Keys are issued at https://dataservice.notonlystock.com/korea/account once the API reopens — 5,000 free credits, no card.
What is in the data
152,367 Korean for-profit corporate headquarters with 10 or more insured employees.
| Field | Present |
|---|
| Employees (Employment Insurance) | 100% |
| Address in English | 100% |
| Established date | 100% |
| Monthly employment series | 91.9% |
| Corporate registration number | 70.5% |
| Phone | 69.3% |
| Listed market · DART code | 25.5% |
| Worksite addresses with headcount | 100% (25.5% have more than one) |
Registration numbers are validated against the National Tax Service. Where a value
could be read as more than it is, a companion field says what kind of value it is —
name_en_class, established_date_source, nps_quality. Which source each field
comes from is in the data guide.
Full data guide → ·
API docs →
What this does not do
No score, no grade, no ranking, no opinion about any company. No sanctions, penalties
or litigation history. No personal data. Facts and their sources only.
Stability
The API is v0. Paths, parameters and field names may change without notice until
v1. Pin nothing you cannot change.
MIT licensed.