@goldprice/mcp

Stdio bridge that wires goldprice.dev's hosted Model Context Protocol server into any MCP client — Claude Desktop, Cursor, or whatever stdio-speaking agent you're using.

Thin proxy. Holds no tool logic. Forwards every JSON-RPC call to https://api.goldprice.dev/v1/mcp/ over the SDK's Streamable HTTP transport, authenticated with your GP_KEY.

Canonical docs and setup guide: https://goldprice.dev/docs/mcp

Install

Claude Desktop

Edit your config file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "goldprice": {
      "command": "npx",
      "args": ["-y", "@goldprice/mcp"],
      "env": {
        "GP_KEY": "ga_live_..."
      }
    }
  }
}

Fully quit Claude (Cmd-Q on macOS, not just the window close) and reopen. The MCP icon should show goldprice with the tools your tier unlocks.

Cursor

.cursor/mcp.json at the repo root or ~/.cursor/mcp.json:

{
  "mcpServers": {
    "goldprice": {
      "command": "npx",
      "args": ["-y", "@goldprice/mcp"],
      "env": { "GP_KEY": "ga_live_..." }
    }
  }
}

Cmd/Ctrl-Shift-P → "Restart MCP servers".

Any other MCP client

Point it at the stdio server directly:

npx -y @goldprice/mcp

Environment variables

| Name | Required | Default | Purpose | |---|---|---|---| | GP_KEY | yes | — | Your ga_live_* API key. Free tier includes MCP access. Sign up at goldprice.dev/pricing. | | GP_BASE_URL | no | https://api.goldprice.dev | Override the upstream host. Accepts root, /v1/mcp, or /v1/mcp/ — the bridge normalises. Use for local-backend testing or on-prem mirrors. | | GP_TIMEOUT | no | 10000 | HTTP request timeout in milliseconds. |

Troubleshooting

Claude Desktop shows "0 tools" or no goldprice entry. Fully quit Claude (Cmd-Q on macOS — closing the window leaves the process alive) and reopen. MCP servers load once on launch. If the config JSON has a stray trailing comma or unbalanced brace, Claude silently skips the server — validate the JSON first.

invalid_api_key or Unauthorized in logs. GP_KEY must be set inside the env block of the MCP config, not in your shell. Claude Desktop does not inherit your terminal environment; it reads the config file literally.

Forbidden when calling a tool. Your tier doesn't cover this tool's data scope. The bridge surfaces the backend's plan-gate error unchanged. See the per-tier tool list at goldprice.dev/docs/mcp#tools or upgrade at goldprice.dev/pricing.

Rate limited errors. Per-minute limits are shared with REST against the same API key. Back off and retry. Heavy agent usage (scripted backtests in a loop) lives on Pro or Teams; interactive chat fits in Basic.

Still stuck? Email [email protected] or file an issue at github.com/michaelmustopo/goldprice-dev.

Local development

git clone https://github.com/michaelmustopo/goldprice-dev.git
cd goldprice-dev/packages/mcp-client
npm install
npm run build

Test the bridge against the live backend with a real key:

GP_KEY=ga_live_... node dist/index.js
# Then send a JSON-RPC initialize message on stdin to exercise the
# proxy, or point Claude Desktop at the local dist/ via a "command":
# "node" + "args": ["/absolute/path/to/dist/index.js"] config.

License

MIT — see LICENSE. Copyright © 2026 Nusantara Ventures LLC.