Mercury MCP Server ★ Official (Beta) - New July 17¶

Mercury's official MCP server connects AI agents to your Mercury business banking data - accounts, transactions, balances, and cards - through a secure OAuth 2.0 flow. The hosted server at https://mcp.mercury.com/mcp supports Dynamic Client Registration (RFC 7591) so you can register clients without manual setup.

This is a landmark MCP server: Mercury is the first banking platform to ship an official MCP server, enabling AI agents to access financial data in a read-only, OAuth-secured model.

Source: mcp.so (discovered July 17, 2026) Category: Finance / Banking / Startup Operations Author: Mercury (Official) Docs: https://docs.mercury.com/docs/connecting-mercury-mcp Endpoint: https://mcp.mercury.com/mcp Status: Beta (MCP added ~July 6, 2026)

What It Does¶

Accounts - list and view Mercury business accounts
Transactions - search and retrieve transaction history
Balances - check current balances across accounts
Cards - view Mercury debit/credit card information
Read-only by design - Mercury scoped the MCP to prevent unintended actions

Key Innovation: Banking Data Without Credential Exposure¶

Mercury's MCP design mirrors the emerging enterprise pattern: the agent orchestrates financial queries while OAuth enforces the security boundary. Your Mercury login credentials are never shared with the AI tool - authentication happens through Mercury's OAuth flow.

Sessions remain active for 3 days per chat thread, after which re-authentication is required.

Setup¶

Quick Start (Claude/ChatGPT)¶

Open Add Connectors in Claude or Apps & Connectors in ChatGPT
Create a new custom connection
Add Mercury as a new MCP using URL: https://mcp.mercury.com/mcp
Start a chat asking about Mercury data - OAuth login prompt appears
Authenticate with your Mercury credentials

Dynamic Client Registration (For App Developers)¶

Mercury supports OAuth 2.0 Dynamic Client Registration (RFC 7591). Register your client:

curl -X POST https://mcp.mercury.com/register \
  -H "Content-Type: application/json" \
  -d '{
    "redirect_uris": ["https://your-app.com/callback"],
    "client_name": "Your App Name"
  }'

You'll receive a client_id and client_secret for the standard OAuth authorization code flow. Client names must not contain "Mercury."

Hermes/Claude Code Config¶

{
  "mcpServers": {
    "mercury": {
      "url": "https://mcp.mercury.com/mcp",
      "transport": "streamable-http"
    }
  }
}

Business Relevance¶

First banking MCP: Mercury is the first financial institution to ship an official MCP server. This signals that regulated financial services are embracing the protocol.
Operator dashboard in AI: Business operators can query account balances, recent transactions, and card activity directly from their AI workspace - no context-switching to Mercury's dashboard.
Startup finance automation: AI agents can monitor cash position, flag unusual transactions, and generate financial summaries without manual data entry or API integration work.
Read-only safety: Mercury's scoping to read-only access is the right pattern for financial MCP servers. Operators get data visibility without risking unintended transfers.

Use Cases for Business Operators¶

Daily cash position check: "What's my current balance across all Mercury accounts?"
Transaction monitoring: "Show me all transactions over $5,000 this week."
Spend categorization: "Categorize last month's card transactions by vendor type."
Financial snapshots: "Give me a summary of cash flow for the past 30 days."
Vendor analysis: "How much have we paid AWS this quarter?"

Integration with CorpusIQ¶

CorpusIQ is the connector layer that lets AI assistants read the systems a business already runs on - accounting, payments, CRM, email, files and analytics - and answer with the source named. It is read-only by design: it retrieves data and never writes to, or acts in, a connected system, which is what makes it safe to point at live accounts.

This page is part of the CorpusIQ directory, the reference we maintain for the MCP server and agent-skill ecosystem. Run alongside CorpusIQ, a third-party server like this one can be combined with a company's own business data in a single answer.

See what CorpusIQ connects

Limitations¶

Hosted only: Mercury does not offer a non-hosted/local MCP at this time
Read-only: No transaction creation, transfers, or account management via MCP
3-day sessions: OAuth sessions expire after 3 days per thread
Beta status: API may change; production reliance should include fallback