mercury

Mercury

Cursor plugin that connects agents to Mercury through Mercury's official remote Model Context Protocol server.

Answer questions about a Mercury business banking account — balances, transactions, statements, cards, and recipients — without exposing any way to move money.

Install

1. Open Cursor Settings → Plugins.
2. Search for Mercury.
3. Click Install, then complete the Mercury sign-in prompt.

Or run /add-plugin mercury in chat.

MCP

{
  "mcpServers": {
    "mercury": {
      "type": "http",
      "url": "https://mcp.mercury.com/mcp"
    }
  }
}

Auth is OAuth 2.1 with Dynamic Client Registration and PKCE. Cursor registers itself and prompts for Mercury sign-in when the plugin connects — there is no API key or client ID to configure.

What agents can do

Category	Capabilities
Accounts	Account details and current balances
Transactions	Transaction reporting with category, merchant, user, and card metadata
Statements	Retrieve account statements as PDFs
Cards & recipients	Card details and recipient/payee records

The hosted runtime is the source of truth for tool names and schemas.

Notes

• The server is strictly read-only. It cannot initiate transactions or modify account data.
• The OAuth scope is read, plus offline_access if the client wants refresh without another browser round-trip. PKCE with S256 is required — plain is rejected.
• Mercury labels the MCP server as beta.
• Mercury's own security guidance is to check the endpoint domain before installing from any marketplace. This plugin points at https://mcp.mercury.com/mcp, which is the URL in Mercury's docs.

Docs

• What is Mercury MCP: https://docs.mercury.com/docs/what-is-mercury-mcp
• Connecting Mercury MCP: https://docs.mercury.com/docs/connecting-mercury-mcp
• Supported tools: https://docs.mercury.com/docs/supported-tools-on-mercury-mcp
• Server URL: https://mcp.mercury.com/mcp

Logo is Mercury's official mark, from the mercury GitHub organization.

License

MIT