Korea Company Data
Korean company identity, registration status and monthly payroll-based employment, in English.
Install
Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).
claude mcp add --transport http korea-company-data 'https://notonlystock.com/korea/mcp'{
"mcpServers": {
"korea-company-data": {
"type": "http",
"url": "https://notonlystock.com/korea/mcp"
}
}
}korea-data-mcpclaude mcp add korea-company-data -e 'KCID_API_KEY=<your kcid_api_key>' -- npx -y korea-data-mcp@0.1.2{
"mcpServers": {
"korea-company-data": {
"command": "npx",
"args": [
"-y",
"korea-data-mcp@0.1.2"
],
"env": {
"KCID_API_KEY": "<your kcid_api_key>"
}
}
}
}Environment variables
KCID_API_KEYrequired secret API key from https://notonlystock.com/korea/account — new accounts start with 50 free credits.
Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
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.
korea-data | Command line — npx korea-data 124-81-00998 · npx korea-data rail 용산 |
korea-data-mcp | MCP server for agents |
openapi.yaml | REST API description |
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.
Frequently asked questions
What is Korea Company Data?
Korean company identity, registration status and monthly payroll-based employment, in English.
How do I install Korea Company Data?
It runs as a remote server. In Claude Code: claude mcp add --transport http korea-company-data 'https://notonlystock.com/korea/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.
Does Korea Company Data need an API key?
Yes. It expects KCID_API_KEY, which you set in its configuration.
Is Korea Company Data open source?
Yes. Its code is on GitHub under the MIT license.
Who maintains Korea Company Data?
It is published by lichtsalz. AI.tn lists it but does not maintain or endorse it.
From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.