A Claude Code add-on for Japanese stock-market data through the J-Quants API. It covers shares, financial reports, indexes, derivatives, margin and short-selling data, market screeners, technical indicators, and chart data, with a local SQLite cache.

Use it to query Japanese equities and financials, screen the market, inspect trading and derivatives data, calculate or retrieve technical indicators, and obtain chart-ready JSON.

It brings many Japanese-market datasets into the coding agent and can reuse locally cached data. J-Quants is the data service that supplies the Japanese market information.

jquants-mcp — Plugin for Claude Code by shigechika

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/shigechika/jquants-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/shigechika/jquants-mcp/plugin/github.svg)](https://agentmods.dev/plugins/shigechika/jquants-mcp/plugin)

Your own site

<a href="https://agentmods.dev/plugins/shigechika/jquants-mcp/plugin"><img src="https://agentmods.dev/badge/plugins/shigechika/jquants-mcp/plugin/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/shigechika/jquants-mcp/plugin"><img src="https://agentmods.dev/badge/plugins/shigechika/jquants-mcp/plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

jquants-mcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugin/.claude-plugin/plugin.json · 23 lines

What it actually says

{
  "$schema": "https://json.schemastore.org/claude-code-plugin-manifest.json",
  "name": "jquants-mcp",
  "displayName": "J-Quants MCP",
  "description": "Japanese stock market data via J-Quants API v2, for Claude Code. 55 tools covering equities, financials, indices, derivatives, margin/short-selling data, market-wide screeners, technical indicators, and JSON chart data, backed by a local SQLite cache. Zero-config on a machine that already runs jquants-api-client (auto-reads ~/.jquants-api/jquants-api.toml); otherwise run `jquants-mcp login` or set JQUANTS_API_KEY.",
  "author": {
    "name": "AIKAWA Shigechika",
    "url": "https://github.com/shigechika"
  },
  "homepage": "https://shigechika.github.io/jquants-mcp/",
  "repository": "https://github.com/shigechika/jquants-mcp",
  "license": "MIT",
  "keywords": [
    "jquants",
    "stocks",
    "japan",
    "market-data",
    "finance",
    "trading",
    "screener"
  ]
}

Contents

What it installs

The manifest is a name and a version. 1 MCP server travel with it, and installing the plugin installs all of them. Each is measured on its own page, and each can be installed alone.

MCP server jquants-mcp A not measured

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 23 lines scan A ce3151653abb

Subscribe to this mod's changes

jquants-mcp is a plugin published in the GitHub repository shigechika/jquants-mcp (2 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Finance and fintech claude fastmcp japan-stock jquants mcp sqlite

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