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The Potomac Ledger is a remote MCP server — one endpoint that plugs into Claude, ChatGPT, Cursor, Grok, and any MCP-capable tool. Ask about the stock trades of Congress and senior executive-branch officials in plain language, answered straight from official disclosures.

MCP endpoint (Streamable HTTP)
https://potomacledger.com/mcp

Free covers the last 90 days — no key required. A Pro key unlocks the full archive (26,000+ trades back to 2020); add it as an Authorization: Bearer YOUR_KEY header (see Pro key, below).

Pick your client

Claude Native

claude.ai web, Desktop & mobile · all plans
  1. Open Settings → Connectors.
  2. Click Add custom connector, paste the endpoint, click Add.
  3. In a chat, open the + / tools menu and toggle Potomac Ledger on for that conversation.
  4. Ask about congressional or executive-branch trades.

Free plan allows one custom connector. Team/Enterprise: an Owner adds it under Organization settings → Connectors first, then members enable it. Adding it in Settings isn’t enough on its own — it must be toggled on per chat.

Claude Code Native

CLI · any install
  1. Run one command:
claude mcp add --transport http \
  potomac https://potomacledger.com/mcp

Add --scope user to make it available in every project. Pro key: append --header "Authorization: Bearer YOUR_KEY". Verify with claude mcp list.

ChatGPT Developer mode

Plus, Pro, Business, Enterprise, Edu (web)
  1. Settings → Connectors (being renamed “Apps”) → Advanced → turn on Developer mode.
  2. Back in Connectors, click Create, paste the endpoint, finish.
  3. In a chat, open Tools / Use apps and enable it.

Developer mode is a beta flag and the “Connectors→Apps” rename is mid-rollout, so labels may differ in your account. Business/Enterprise may require an admin to enable custom connectors first.

Cursor Native

Editor · one-click or manual
Add to Cursor

One-click — requires the Cursor app installed (the button won’t open otherwise). Or add it manually: Settings → Tools & Integrations (MCP) → Add, then in mcp.json:

{ "mcpServers": { "potomac": {
  "url": "https://potomacledger.com/mcp",
  "type": "streamableHttp"
} } }

Grok New 2026

xAI · Pro, Max, Enterprise
  1. Go to grok.com/connectors.
  2. Click New Connector → Custom.
  3. Paste the endpoint and authenticate if prompted.

xAI added end-user custom MCP connectors in 2026; available on paid tiers. It’s a brand-new feature, so exact labels may still shift.

Any other MCP client Bridge

VS Code, Windsurf, Cline, & stdio-only clients
  • VS Code (Copilot), Windsurf, Cline: add a remote server at the endpoint in their MCP settings.
  • stdio-only clients: bridge it locally:
npx mcp-remote https://potomacledger.com/mcp

VS Code uses a servers key with "type":"http"; Windsurf uses serverUrl. The bridge handles auth and transport for clients without native remote support.

Pro key

After you upgrade, your API key is emailed within a few minutes. Pass it as a bearer header so the server returns the full archive instead of the free 90-day window:

Authorization: Bearer YOUR_KEY

Most clients have a headers field for this; Claude Code uses --header; the bridge takes --header "Authorization: Bearer YOUR_KEY". See Pro pricing →