Connect OpenDART to Claude
Query OpenDART directly from Claude. Arlet links the two through one MCP connection and takes care of API keys.
This server connects your AI client to OpenDART, the Financial Supervisory Service's official API over DART - Korea's electronic disclosure system where listed companies file their reports. For anyone tracking Korean competitors (semiconductors, batteries, autos, chemicals), this is the primary source.
Key features:
- resolve_company: turn a company name (Korean or English) or 6-digit stock code into the 8-digit corp_code that the other tools take. The corp-code master is a 100k-company archive, cached server-side so lookups stay fast.
- list_disclosures: filings by company, date range and type - periodic reports (annual ์ฌ์ ๋ณด๊ณ ์, quarterly ๋ถ๊ธฐ๋ณด๊ณ ์), major issues reports, ownership disclosures - each with a direct DART viewer link.
- get_company: profile with official names, market (KOSPI/KOSDAQ/KONEX), CEO, registration numbers, industry and fiscal year end.
- get_financials: key accounts (revenue, operating profit, net income, total assets/liabilities/equity) from a chosen year and period, consolidated by default, with two prior periods for comparison.
Report names and account names come back in Korean; the tool notes explain the common ones (๋งค์ถ์ก = revenue, ์์ ์ด์ต = operating profit).
Using the API requires a free 40-character key issued at opendart.fss.or.kr (English portal: engopendart.fss.or.kr) - email verification only, roughly 20,000 requests/day. Set it as DART_API_KEY in your Arlet environment variables.
How to connect OpenDART to Claude
- 1
In the Arlet dashboard, open Data tools, find OpenDART, set the API key issued by OpenDART and switch it on.
- 2
In Claude, open Organization settings โ Connectors from the account menu at the bottom left, then click + Add.
- 3
Choose Custom โ Web, enter "Arlet" as the Name and https://mcp.arlet.dev/mcp/ as the Remote MCP server URL, then click Add. Authentication settings are auto-detected, so keep the defaults.
- 4
The first time you use it, sign in with Google. After that, every service you switched on in Arlet is available from Claude.
Adding a connector is done by an organization admin on Team / Enterprise plans. On Pro / Max you can add it for yourself from Settings โ Connectors with the same steps.