wealthapi-mcp

A small Model Context Protocol (MCP) server that lets Claude (or any MCP-compatible assistant) answer everyday portfolio questions about your wealthAPI account:

"What did I spend the most money on last month?" "How is my portfolio performing this year?" "Show me my five biggest positions." "Which of my investments lost the most value?"

It runs locally on your machine. Your bearer token never leaves your computer.

What is an MCP server?

MCP is an open protocol that lets an AI assistant call tools you control. The assistant runs in one process (e.g. Claude Desktop); the MCP server runs as a separate process you launch. They talk to each other over stdio using JSON-RPC: the assistant writes a tools/call message to the server's stdin, the server runs the tool and writes the result back to its stdout. That's the whole protocol.

Note the distinction: this is an MCP server, not an MCP plugin. There is no such thing as an MCP plugin — plugins (e.g. Claude Code plugins) extend the assistant itself, while an MCP server is a standalone process the assistant connects to over the protocol. Any MCP-compatible client (Claude Desktop, Claude Code, others) can use this server.

Concretely, this repo is a Node script. When Claude Desktop starts it, the script registers its tools, waits for tool calls, and when one arrives, makes an HTTPS request to the wealthAPI REST API on your behalf and returns a text summary. No state, no database, no server to maintain.

Read more at https://modelcontextprotocol.io.

The tools

Auth is a wealthAPI API token (wapi_key_…) carrying the read scopes (accounts:read, investments:read, transactions:read, profile:read). All tools are read-only.

Accounts & cash flow

Portfolio & performance

Dividends

Market data & profile

The server also registers prompts (monthly_review, savings_rate_check, subscription_audit, fixed_costs_summary, financial_health_check) that chain these tools into guided analyses.

Tool registration is gated by SUPPORTED_TOOLS/SUPPORTED_PROMPTS in src/index.ts — remove a name there to disable it without deleting code.

Install

You need Node 20+ and pnpm.

git clone git@github.com:wealthAPI-eu/wealthapi-mcp.git
cd wealthapi-mcp
pnpm install
pnpm build

Get a personal bearer token from wealthAPI (your account → API settings).

Add the server to Claude Desktop's config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "wealthapi": {
      "command": "node",
      "args": ["/absolute/path/to/wealthapi-mcp/build/index.js"],
      "env": {
        "BEARER_TOKEN": "paste-your-token-here"
      }
    }
  }
}

Restart Claude Desktop. The active tools will appear in the tools panel of any chat, and you can ask portfolio questions in plain English.

How to add a new tool

The canonical example lives in src/tools/accounts.ts — list_accounts is ~50 lines and shows the whole pattern.

1. Create or open the relevant file under src/tools/ and write a register*Tools(server, client) function that calls server.registerTool(...). Each call takes a name, a { description, inputSchema } object (Zod for the input schema), and an async handler that returns { content: [{ type: "text", text }] }.
2. Import and call your register*Tools from src/index.ts.
3. pnpm build and restart Claude Desktop.

That's it. No code generation, no registration files, no boilerplate.

Layout

src/
  index.ts          Bootstrap: McpServer + StdioServerTransport + register*Tools(...)
  config.ts         Reads BEARER_TOKEN from env; API base URL is fixed to production
  api/
    client.ts       fetch wrapper: GET/POST, query strings, retry on 5xx/429
    types.ts        TS interfaces for API response shapes
  tools/
    accounts.ts     list_accounts, get_account_balances, get_portfolio_valuation
    allocation.ts   get_portfolio_allocation
    cash-flow.ts    get_cash_flow_summary, get_savings_rate, detect_recurring_transactions
    dividends.ts    get_dividend_history, get_dividend_calendar, get_portfolio_yield
    investments.ts  list_investments, get_gainers_and_losers
    performance.ts  get_portfolio_performance, get_realized_gains
    risk.ts         get_risk_metrics
    securities.ts   search_symbols, get_quotes, get_security_fundamentals
    transactions.ts list_transactions, list_bookings
    user.ts         whoami
  util/
    logger.ts       Pino → stderr (stdout is reserved for MCP)
    format.ts       formatCurrency, formatDate, formatTable
test/
  api/
    client.test.ts  Vitest unit test for the query-string builder
  tools/
    *.test.ts       Unit tests for the pure aggregation helpers

Run tests

pnpm test