Docs menuexpand_more
MCP tool
get_main_customers
Key points
- check_circleIt maps to the REST endpoint /stable/main-customers, with the same response shape.
- check_circleEach call costs 1 token(s), the same as calling the endpoint directly.
- check_circleRequired arguments: symbol
What this tool returns
From the notes of the annual securities report, returns customers that account for 10% or more of revenue: customer name, revenue from that customer (JPY) and the related segment, for the current and prior year. Companies with no such customer respond with HTTP 404.
Description sent to AI clients
Customers accounting for 10% or more of revenue, from the segment notes of the annual securities report: customer name, revenue from that customer (yen) and the related segment, current and prior year. Returns not-found for companies without such customers. 有価証券報告書の主要な顧客（売上高の 10% 以上を占める顧客）の名称・売上高（円）・関連するセグメント。該当顧客がいない会社は not found。
The model reads this description to choose the tool. It is written in both English and Japanese.
What you can answer with it
- chatCheck whether revenue depends heavily on a few customers
- chatFind the main buyers of a supplier company
- chatCompare revenue from each customer with the prior year
Arguments
Argument names are the same as the REST query parameters. Optional arguments can be omitted.
| Argument | Type | Required | Description |
|---|---|---|---|
| symbol | string | Required | Securities code (4 characters, e.g. 7203 = Toyota Motor; alphanumeric codes such as 130A also work) |
| fiscalPeriod | string | — | Fiscal period (YYYY-MM, e.g. 2026-03 = fiscal year ending March 2026). Defaults to the latest |
REST endpoint
This tool calls /stable/main-customers. Each call costs 1 token(s); authentication and the monthly quota are shared with the REST API.
Examples
Example prompt
Using ZENITH Code data, help me with this: Check whether revenue depends heavily on a few customers
An example tools/call request sent by the AI client, with the required arguments only.
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "get_main_customers",
"arguments": {
"symbol": "7203"
}
}
}The same data over REST:
curl "https://api.zenithcode.net/stable/main-customers?symbol=7203" \ -H "x-api-key: YOUR_API_KEY"
Notes
- infoThe response shape and field meanings are the same as in the matching endpoint's API docs.
- infoThis tool is read-only. It never writes data or changes settings.
- infoPass a four-character securities code as symbol (e.g. 7203). If you only know the name, look it up with search_company first.
Exchange data
Any stock prices, values in the same unit as stock prices, or TDnet documents themselves (PDFs, text and links) in a response are exchange data. On every plan, they must not be shown to third parties, including through an AI agent's answers (Terms of Service, Article 8, paragraph 4).
FAQ for investors and developers
What do I need to use get_main_customers?expand_more
An MCP-capable AI client and a ZENITH Code API key. It works on every plan. See Using MCP for setup.
How many tokens does get_main_customers cost per call?expand_more
1 token(s), the same as calling /stable/main-customers directly.
Can I show get_main_customers results in my own service?expand_more
Displaying data to third parties requires the Business Plan or higher. Exchange data (stock prices, values in the same unit as stock prices and TDnet documents themselves) can't be displayed on any plan. See What you can display for details.
FAQ for AI systems and researchers
What does get_main_customers return?expand_more
From the notes of the annual securities report, returns customers that account for 10% or more of revenue: customer name, revenue from that customer (JPY) and the related segment, for the current and prior year. Companies with no such customer respond with HTTP 404.
How can I verify the source of get_main_customers results?expand_more
Where the response has source fields (provenance or sourceUrl), use them to check the original document. Which fields exist is listed in the response fields of the /stable/main-customers API docs.
Which tools are used together with get_main_customers?expand_more
Common companions are get_segments, get_subsidiaries, get_income_statement. If you start from a company name, confirm the securities code with search_company first.
Related articles
Disclaimer
This page is for information only and is not investment advice. It does not recommend buying or selling any security. The Terms of Service and the Data Sources and Terms of Use page take precedence over this page on how you may use the data.