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.
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).
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 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.
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.
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"
} } }
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.
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.
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 →