Yahoo Finance MCP Server

An MCP server that exposes Yahoo Finance data to MCP clients (such as Claude Desktop). It runs over stdio (default, for local clients) or an HTTP transport (for standalone / containerized hosting). Market data is sourced through the yfinance library, which uses Yahoo's unofficial endpoints.

Disclaimer

• This project is not affiliated with, endorsed by, or sponsored by Yahoo. "Yahoo" and "Yahoo Finance" are trademarks of their respective owners.

• It relies on unofficial Yahoo Finance endpoints via yfinance. Those endpoints can change or break at any time, and Yahoo may rate limit or block requests. Review Yahoo's Terms of Service before use.

• Data may be delayed, incomplete, or inaccurate. Nothing here is financial advice. Do not rely on it for trading or investment decisions.

• Provided "as is", without warranty. Intended for personal and educational use. You use it at your own risk. See LICENSE.

• For commercial use, review Yahoo's Terms of Service and consider a properly licensed market-data provider instead of the unofficial endpoints.

Tools

All get_* tools take a Yahoo Finance symbol. Use search to resolve a name or ISIN into a symbol first.

Related MCP server: YFinance MCP Server

Requirements

• Python 3.11+

• A virtual environment (all work is done inside .venv)

Setup

The only platform difference is the venv interpreter path: Windows uses .venv\Scripts\python.exe, Linux/macOS use .venv/bin/python.

Windows (PowerShell):

py -m venv .venv
.\.venv\Scripts\python.exe -m pip install -e .

Linux / macOS (bash):

python3 -m venv .venv
.venv/bin/python -m pip install -e .

Running

The transport is chosen on the command line. stdio is the default (used by Claude Desktop and other local clients):

Windows (PowerShell):

.\.venv\Scripts\python.exe -m yahoo_finance_mcp

Linux / macOS (bash):

.venv/bin/python -m yahoo_finance_mcp

To run it as a standalone, network-reachable service, use an HTTP transport (same flags on every OS, only the interpreter path differs):

# Streamable HTTP on http://127.0.0.1:8000/mcp
.venv/bin/python -m yahoo_finance_mcp --transport streamable-http

# Bind all interfaces on a custom port / path
.venv/bin/python -m yahoo_finance_mcp \
    --transport streamable-http --host 0.0.0.0 --port 9000 --path /yf

Every option has both a CLI flag and an environment variable (handy for containers). Precedence is CLI > environment > default (--help for the full list):

Logging always goes to stderr, so under stdio stdout stays reserved for the JSON-RPC protocol.

Note: The HTTP transports expose the server over the network without built-in authentication. Only bind to 0.0.0.0 on trusted networks, and put a reverse proxy / auth layer in front for any real deployment.

Docker

A Dockerfile builds a small image that hosts the server over the streamable-HTTP transport (the stdio transport is for local subprocess use and is not what you containerize).

The image is configured entirely through environment variables (see the options table above) — it carries no default command arguments, so overriding a single setting with -e does not disturb the others.

# Build
docker build -t yahoo-finance-mcp .

# Run with the built-in defaults (streamable-HTTP on 0.0.0.0:8000)
docker run --rm -p 8000:8000 yahoo-finance-mcp
# Server is now reachable at http://localhost:8000/mcp

# Override settings via -e; opt into the cache and persist it in a named volume
docker run --rm -p 9000:9000 \
    -e YF_MCP_PORT=9000 \
    -e YF_MCP_LOG_LEVEL=DEBUG \
    -e YF_MCP_CACHE=1 \
    -v yahoo-finance-cache:/cache \
    yahoo-finance-mcp

The image runs as a non-root user and includes a healthcheck on the configured HTTP port. The cache is off by default; enable it with -e YF_MCP_CACHE=1, in which case it is written to /cache (declared as a volume) — mount a named volume there to keep it across container restarts. As with any HTTP deployment, there is no built-in authentication — front it with a reverse proxy / auth layer before exposing it publicly.

Docker Compose

A compose.yaml is provided (settings under environment:, cache in a named volume):

docker compose up -d      # build (if needed) and start in the background
docker compose logs -f    # follow logs
docker compose down       # stop and remove

This requires Docker Compose v2 (the compose CLI plugin). The server is then reachable at http://localhost:8000/mcp.

Claude Desktop configuration

Add the server to your claude_desktop_config.json, using the absolute path to the venv interpreter.

Windows:

{
  "mcpServers": {
    "yahoo-finance": {
      "command": "C:\\path\\to\\xt-yahoo-finance-mcp\\.venv\\Scripts\\python.exe",
      "args": ["-m", "yahoo_finance_mcp"]
    }
  }
}

Linux / macOS:

{
  "mcpServers": {
    "yahoo-finance": {
      "command": "/path/to/xt-yahoo-finance-mcp/.venv/bin/python",
      "args": ["-m", "yahoo_finance_mcp"]
    }
  }
}

Example prompts

Once the server is connected, you can ask the client natural-language questions and it will pick the right tools. Replace the bracketed placeholders (e.g. [Ticker], [ISIN]) with concrete values.

Price & quote (get_quote, get_history)

• "What's the current price of [Ticker] and how has it moved over the last 24h?"

• "Get the daily closing prices of [Ticker] for the last 6 months and compute RSI, MACD, and the 50/200-day moving averages."

• "What was the max drawdown of [Ticker] since inception, and how long was it underwater?"

• "Compare the performance of [Ticker A] against [Index] over 1, 3, and 6 months (relative strength)."

• "How far is [Ticker] currently from its 52-week high?"

Company data & valuation (get_company_info, get_financials)

• "Give me P/E, beta, market cap, and dividend yield for [Ticker]."

• "Are the fundamentals (ROE, leverage, margins) for [Ticker] available via Yahoo? If not, flag the metric as unavailable."

• "How liquid is [Ticker]? Average daily volume and market cap."

Analysts & sentiment (get_recommendations, get_news)

• "What's the current analyst consensus for [Ticker], and any up-/downgrades from the last few weeks?"

• "How far is the average price target for [Ticker] above/below the current price?"

• "Any recent news on [Ticker], and is the sentiment positive or negative?"

Dividends (get_dividends)

• "List the distribution history of [Ticker] and compute the total-return recovery including reinvested dividends from [year]."

• "From which year does Yahoo cover dividends for [Ticker]?"

Search / resolution (search)

• "Resolve the ISIN [ISIN] to a Yahoo ticker."

• "Which Yahoo ticker belongs to [security name] on [exchange]?"

Combined daily update (multiple tools)

• "For the asset list [Ticker, Ticker, …]: for each name, pull the price history (6 months), quote, company info, and analyst recommendations, then summarize the current technical and sentiment picture per asset."

The server only returns raw market data; any derived metrics (RSI, MACD, drawdown, sentiment, total return) are computed by the client/model from that data, not by the tools themselves.

Symbol resolution

All get_* tools expect a Yahoo Finance symbol (e.g. AAPL, SAP.DE). To resolve a company name or an ISIN to a symbol, call search first — the same Yahoo search endpoint handles free text, tickers, and ISINs.

Caching

An opt-in persistent cache. When enabled, successful tool results are cached in a small SQLite file with a per-tool time-to-live (TTL) to reduce load on Yahoo's endpoints and survive restarts. Fast-moving data has a short TTL, stable data a long one.

Within a single running process yfinance already reuses identical requests, so the cache mainly helps across restarts and as rate-limit protection — that is why it is off by default.

Cache names (used for --cache-ttl <NAME>=<SECONDS> and YF_MCP_CACHE_TTL_<NAME>) and their default TTLs:

• Off by default; enable with --cache or YF_MCP_CACHE=1.

• Location: the OS user cache directory, or --cache-dir / YF_MCP_CACHE_DIR.

• Override a TTL: --cache-ttl quote=15 (repeatable) or the YF_MCP_CACHE_TTL_<NAME> env var (e.g. YF_MCP_CACHE_TTL_QUOTE=15). Set a TTL to 0 to bypass caching for that tool.

Precedence is CLI > environment > default. Errors are never cached.

When to enable it

Enable the cache (--cache / YF_MCP_CACHE=1) if you:

• run the server as a long-running or containerized HTTP service that restarts periodically (the cache survives restarts → instant repeat results);

• hit Yahoo rate limits or make many repeated identical requests over time;

• mostly query slow-changing data (search, company info, financials), where staleness is irrelevant.

Leave it off (the default) if you:

• run it locally over stdio for interactive sessions — yfinance already reuses identical requests within a single process, so the cache adds little;

• need the freshest possible data;

• use it only occasionally.

Development

Install the dev extras, then run the test, lint, and type-check steps (the same ones CI runs). Replace .venv/bin/python with .venv\Scripts\python.exe on Windows:

.venv/bin/python -m pip install -e ".[dev]"

.venv/bin/python -m pytest -q                 # unit tests (offline)
.venv/bin/python -m ruff check .              # lint
.venv/bin/python -m ruff format .             # format
.venv/bin/python -m mypy                      # type check
.venv/bin/python -m pytest --cov=yahoo_finance_mcp   # coverage

The unit tests mock yfinance and run fully offline. tests/smoke.py performs an ad-hoc check against live Yahoo Finance and is not part of the unit suite. CI also runs across Python 3.11–3.13 and enforces an 80% coverage floor.